Posts Tagged ‘water filter’

The Post – New Fiddler Babies

March 29, 2008

I was amazed to see babies born before Monday. Monday was 2 weeks to the best of my knowledge. So she delivered a couple of days earlier than I expected.

Anyway, yesterday started with me doing a 30% water change as nitrite levels in the tank since Scarlett has been in there, have been hovering between 0.5 – 1.0 ppm. I kept the water filter running to give the water the best chance of staying nitrite free and letting the nitrogen cycle mature.

This evening though, I noticed that Scarlett was very agitated. She kept running back and forth in the tank, climbing up onto the air bubbler and waving her claws in front of her as if trying to spread something in the water. There did not appear to be anything in front of her though. I noticed that the center of the egg mass seemed to be swelling. Given that, I went ahead and shut off the water filter.

For the next hour or two, Scarlett O’Hara kept moving around, seeming very uncomfortable. Around 8:30 p.m. I looked over at the tank and noticed she was sitting quietly in the front of the tank eating. She seemed “slimmer.” Looking closer, I realized, she no longer had the egg mass. So I missed the delivery again. However, a quick look around the tank and I could seen thousands of tiny little dots swimming around.

I fed them a small amount of Small Fry and ZooPlex. I wondered if this will go okay since I couldn’t get the nitrites to zero before they were born.

This morning I got up and looked at the tank. It was a white cloud. I thought, “Oh God, the water quality got worse with all the babies in there and the nitrites are probably through the roof.” I looked at the ammonia monitor and it is in the safe zone. I shined a light into the white murk and could see thousands of babies swimming around. So they’re still alive and ?healthy.

Wondering why the tank is so cloudy, I decided to recheck water parameters:

pH 8.0 – good; alkalinity 300, hardness >300, chlorine 0 – all great results, AND the REAL KICKER OF ALL: NITRITES AND NITRATES ZERO!!!! Puzzled, I repeated the nitrites test using a tube test instead of the dipstick. Again – nitrites are ZERO!!

So water quality is actually BETTER??? I looked in the tank and saw all the babies flitting around and MANY on the calcium sand at the bottom. That’s when the light bulb went off in my head. The water cloudiness is “white” like the bottom sand….could it be cloudy because thousands of little tiny guys are bouncing around against the sand at the bottom, eating whatever’s in it (since it’s ground up from live coral…possibly some microscopic food bits there?), and eating it for calcium for their molting?

If they were out in the ocean they’d have “bottom stuff” to dig around in so maybe this is a good thing? Though it certainly makes it harder to see them. For whatever reason, baby fiddlers seem to like to “head for the bottom” – at least some of them. That happened last time with many burrowing into the gravel and dying. So I will see how this calcium sand thing goes. I am PLEASED though that the water quality is so good.

For today – I need to go feed them again and I will need to start raising the salinity to ocean level. If that IS what should happen, they should survive. If not, well, we’ll find out. One step at a time.

The Post – Scarlett O’Hara “Labor and Delivery” Watch, and Ammonia Monitoring

March 27, 2008

For the last several days, Scarlett has been sitting on top of, or in, the water filter. Even though I shut down the filter Tuesday (so no babies would get sucked up in the filter material should they hatch), she continues to stay inside the empty filter. I guess it’s like a cave – nice and sheltered. She hasn’t come out to eat, but then I imagine that filter material has a ton of bacterial and algal critters all over it.

She DOES need to be in water at some point and on that count I’m not sure how long she can stay out of the water and in the filter. I tried chasing her out of the filter Tuesday afternoon, partially to see if she was okay, and partially to see if overcoming inertia and forcing her out would keep her out, but within minutes she was back inside of the filter. Who knows if she climbs out at night when the lights are off, to go for a swim.

Wed morning she was inside the filter, still sitting at the bottom. She wasn’t moving so I jiggled the filter cartridge enough to see her move. I left her alone until Wed afternooon when I pulled the filter cartridge up a bit. Scarlett O’Hara rushed up and out of the water filter and down into the water. She sat underneath the water filter, so I guess she’s just “staying put in sheltered places.” However, she does appear to be okay.

I tried giving her a couple of shrimp pellets, assuming she must be hungry, but she basically pushed them aside. She did pick at the calcium sand, so I expect she’s looking for algae. I dropped in a couple bits of algae pellets but she ignored those too. So either she isn’t hungry due to the pregnancy, something’s wrong, or she’s full from eating whatever is on that filter packing material. Right now she is still out in the tank and has even wandered over to the air bubbler at the other end of the tank. I am heartened to see her doing her usual activities: climbing up on the bubbler, trying to climb up the side of the tank, and resting on the suction cups behind the air filter that hold it in place. So, for now, I guess, all is well.

My only “curiosity” is “will she stay out into the water to deliver the babies?” I expect she will given that female fiddler crabs look for places in their estuary homes that have active water currents so the eggs can be washed out to sea. So “instinct” alone should propel her back into the tank water at about the time of delivery, no matter how much she likes it inside the water filter. Given she did it right the first time, I can’t imagine she’s forgotten what she needs to do. I missed the delivery the first time so I don’t know exactly what she does to release them. I hope I catch it this time. Also, I do wish I could just ask her why she likes living at the bottom of a dark empty water filter. In lieu of that conversation, all I can do is watch and wait…..

Water parameters Wed afternoon were good: Nitrates 10, Nitrite 0, Hardness >300, Chlorine 0, Alkalinity 300, pH 8.0 and the Ammonia monitor is in the “safe” range at < 0.02 ppm.

The ammonia monitor is a Seachem Ammonia monitor that you can hang inside the tank. No test strips or kits. This one is called the Seachem AmmoniaAlert for Fresh and Marine tanks. It continuously monitors the free ammonia level in the water for over a year.

The monitor is color coded for concentrations:

– Safe (<0.02 ppm), Yellow

– Alert ( 0.05 ppm), Green

– Alarm ( 0.20 mg/dl), Sky Blue

– Toxic ( 0.50 mg/dl), Lavender

The insert says that the “Alert Level” of free ammonia can be tolerated for several days; “Alarm” for a few days; and “Toxic” is rapidly harmful. It would have been interesting to see what it read when I had the phytoplankton overgrowth and high nitrites, the first time I did this.

While I knew that monitoring ammonia was important and somehow related to the level of nitrites and nitrates, I wasn’t sure exactly what was going on. I found a good website, The Tropical Tank, done in the UK, that discusses water chemistry, and in particular, ammonia, nitrites, and nitrates. It’s called: More on the Nitrogen Cycle: Ammonia, Nitrite, and Nitrate

In short, there should be no ammonia or nitrite in a mature tank. Any ammonia is present in two forms: ammonia (NH3) and ammonium ion (NH4+). Ammonia is more toxic than the ion, and the higher the aquarium pH, the higher the ammonia level. Since brackish and marine tanks are basic, ie higher pH, ammonia toxicity is a constant risk.

Ammonia in a mature tank is oxidized by nitrogen-fixing bacteria, to nitrites and again, in a mature tank, nitrites are oxidized to nitrates. While you don’t want to see nitrates run high, a lower level , say < 50 ppm, are considered okay, 25 ppm is even better. If your tank isn’t cycling well, is new and not enough nitrogen-fixing bacteria, you have too many tank inhabitants, or you’ve overfed them, ammonia (and hence nitrites and nitrates) will start to spike.

The bottom line, the appearance of rising ammonia levels is the first clue that things in the tank are not well and even toxic. Given that my last endeavor with crab larvae resulted in mass death due to high nitrites (and yes, the phytoplankton caused an algae bloom that caused ammonia and nitrites to spike and I won’t use it again) I thought it might be interesting to monitor the ammonia levels in the tank on a continuous basis through this project.

This article also gives information on how to start up the nitrogen cycle in a fishless tank. I wondered how you get the cycle going when there are no fish or fish wastes to start the process.

If you are interested, this same UK website has two other interesting articles:

The Basis of Cycling: a good overview of the maturing nitrogen cycle in aquariums

Fishless Cycling Data provided to them by a US forum member, William Wallace; some concrete data on how Mr. Wallace actually did this process.

To return to the tank and Scarlett:

Wed evening, the water looked cloudy and while other parameters were still fine, I noticed a trace amount of nitrites now. I also noticed a few green spots in the yellow safe zone of the ammonia monitor. The green spots are the beginning of a change to “alert.” Given that I think we’re a few days away from birth yet, I decided to turn the water filter back on for a day or so to try and improve the tank conditions. I suspect that adding Scarlett to the tank was enough to catalyze the nitrogen cycle into high gear. It’s to be expected to see “some” ammonia and nitrites, and there also is a “good” level of nitrates, but still, I don’t want to lose the battle of water quality before the babies are even born. I will continue to monitor water quality closely today today. If necessary, I’ll do some water changes, but I would rather not do that. Since the nitrogen cycle is in its early stages, every time I take water out and put in new water, it removes some of the very nitrogen-fixing bacteria I need. The gentleman at the aquarium store said it would be best to just let the tank evolve. So as long as we don’t go beyond “alert” on the ammonia monitor, I’ll let it “evolve.” Otherwise…I’ll have to start water changes. I wish I’d known earlier about the fishless cycling Mr. Wallace did. I could have done that with this tank to get the nitrogen cycle established before moving Scarlett into it.

Tank parameters this morning are the same as yesterday afternoon and Scarlett is out walking around the tank, so, no better, no worse.

Stay tuned.

The Post – Scarlett O’Hara’s Moved to the Nursery

March 25, 2008

Yesterday was one week that we noticed Scarlett O’Hara was pregnant again.

Looking back over my notes on the first pregnancy – we noticed her eggs (2/17/08), then moved her about a week later (2/24/08) into the spare tank I’d just set up. Five days later she delivered. (2/29/08) The one thing we weren’t sure the first time was how long she was carrying the eggs before we noticed. From my log notes, I saw her on the 14th and didn’t notice anything. So, I expect it wasn’t much before 2/17 that she brought the eggs out on her abdomen. Given that, it appears it was about a two week gestation period.

If history repeats itself, 2 weeks will be about 3/31/08, next Monday.

With that in mind, I decided to move Scarlett O’Hara to the nursery. She seems calm this time, doesn’t seem disturbed by the calcium sand, sat under the water filter for a while, then moved toward the side of the tank and greedily went after the shrimp pellets I dropped in.

Since I can’t be sure when the eggs will hatch, I will shut off the water filter today.

Yesterday’s water parameters show both the main aquarium and the nursery aquarium to be about equal. No nitrates in the nursery yet, but moving Scarlett into it should kickstart the nitrogen cycle; I did drop in some shrimp pellets into the nursery the other day, just so “something” organic would be “rotting” in there and feed the nitrogen-fixing bacteria. Hopefully that will be enough to do the trick.

Yesterday’s parameters:

Main aquarium (before moving Scarlett):

Salinity 1.0115, Chlorine 0, Alkalinity 300, Hardness >300, Nitrites 0, Nitrates 20, pH 7.8-8.0

Nursery aquarium:

Salinity 1.013, Chlorine 0, Alkalinity 300, Hardness >300, Nitrites 0-0.5, Nitrates 0, pH 8.2

I have brine shrimp eggs though I won’t start hatching those until the fiddler babies are born. According to the package they take about 24-36 hours to hatch. I have something called “San Francisco Bay Brand: Brine Shrimp Hatch Mix” It has eggs, sodium chloride and magnesium sulfate and you just add a liter of water. I have a container with an air bubbler to put the mix in. No heater though. Just not going to spend another $30 or $40 for a brine shrimp heater. The kid at the pet store who has a marine tank and raises brine shrimp for his fish told me there’s no reason you can’t hatch them at room temp. He does it all the time. I’ll let you know how that works. I don’t know how many shrimp I’ll get in one of these packets. There’s three packets to the package. If needed, I’ll go back to the aquarium store and just get the larger container of shrimp eggs.

If you want to see some good instructions on hatching brine shrimp, as well as some pictures of the shrimp as they go from eggs to the tiny shrimps, click here for the San Francisco Bay Brand website.

In any event, I have the Kent Marine “ZooPlex” product to feed the babies for the first few days until the crab larvae are large enough to chase down live brine shrimp. This food is made to work well for invertebrate larvae and is considered a good brine shrimp replacement. It’s available at PetsMart. Again, we’ll see how it goes.

The Post – Update Time – Fiddler Pregnancy and Book “Delivery”

March 22, 2008

Well the fiddler crab, Scarlett O’Hara’s pregnancy progresses well. I am through “labor and delivery” with Under the Pier’s second draft, and we had an RIP moment for my laser printer, which died trying to print the last two chapters of that draft.

Now, to expand on each just a bit:

Scarlett O’Hara is busy eating or just sitting behind the air filter, in the main fiddler crab tank. Her pregnancy progresses with no odd happenings. Her “nursery” tank is doing well – water parameters are fine and salinity was down to 1.012 when I diluted the water, earlier in the week. I will recheck water parameters and salinity tomorrow in the nursery tank. If they are fine, I will most likely move Scarlett over to that tank Monday or Tuesday. We first noticed her carrying eggs on Monday the 17th. On Sunday the 16th, we saw no evidence of eggs, but that’s when she was spending days living on top of the water filter, sitting in the water currents. So best guess here, is that Monday will be one week. The last time she delivered her babies, it was just about two weeks. So I will move her to the nursery early this coming week. Also, I will shut down the water filter again and just leave the air bubbler running.

I picked up eggs and supplies to hatch brine shrimp and will talk more about that tomorrow. I also picked up a liquid food geared toward larval invertebrates, that is a good brine shrimp substitute. NO MORE LIVE PHYTOPLANKTON. I’m hoping that sticking to the zooplankton food approach will work better and not end up with high nitrites that kill off the babies. So more on this tomorrow and this week.

I spent most of the day on Good Friday, polishing the last chapter of Under the Pier’s second draft. It is finished. Of course it needs more work, but at least now it is a real book. There are no giant piles of fix-it cards or empty places in the chapters where I still had to figure out something or add in a description. Next up in the project:

1) Continue on with the posts about writing Under the Pier – I left off on location as character and Part II of that coming up this week will be more info about specific locations in the story — which though fiction, are amalgamations of real places, as well as how I researched them.

2) I will be putting together the submission package for a couple of editors from last year’s Carolinas – SCBWI conference. These packages include three sample chapters, chapter summaries, and any other info I want to include. At least according to one editor. I have a “map of my story’s town,” a schematic of the diner and the diner area, a smaller map of the area around Max’s house, a schematic of Max’s house, a glossary, probably a bibliography of some of the sources including research papers and the researchers I talked to….and of course, this blog’s address. 🙂

3) Start draft three. This time, I can now read through “completed” chapters, and listen out loud to their rhythm, see where they bog down, see where they need more “sensory details” and also go through the large “revision” charts I made up to see if I’ve covered everything. A later post will cover what I compiled for those revision charts.

Re the demise of my laser printer – FRUSTRATING!!!! I was halfway through printing the last two chapters when it seized up and died. Now I can’t really complain. I’ve had that printer almost 7 years and have printed thousands of pages. I got my money’s worth out of it. I was just hoping not to have to a) deal with buying a new printer just to finish printing my book and b) spend the money now. But…. c’est la vie. We now have a new HP Laserjet P3005dn. I need to make it my friend. 🙂

Anyway, that’s the state of affairs here. Oh, and also, given the impending draft three of the book, I need to get going on “Creature Features” So stay tuned!

The Post – Scarlett O’Hara, The Pregnancy – Take #2

March 17, 2008

That’s right folks. My husband spotted it this morning. Scarlett O’Hara is pregnant again!! I wondered.

She climbed back down into the tank this morning after almost 3 days up on top of the water filter. Just like last time – spend a few day on top of the water filter, next thing you know, she’s got a bunch of eggs on her abdomen.

I am wondering if there is something about the water filter, maybe the flow of the water up through it as she sits in the currents, that helps the eggs come out onto her abdomen? Does this replicate something about water currents in nature when fiddler crabs “bring out” their eggs?

In any event, knowing that the last time she hung around on the water filter, she was pregnant, we had been watching her closely these last 3 days. She did NOT have any eggs showing Friday, Saturday or Sunday, but there they are on Monday morning.

So we call this day #1 of “Pregnancy, Take 2.” I figured we’ve got about two weeks before she’ll drop the babies again. I’d like that nursery tank to have a full week to just run and establish itself before I move her over to it. Parameters in the nursery tank are good: No chlorine, nitrites, or nitrates. pH is about 8.0, water hardness >300, and alkalinity is running about 200 today. I need to bring the salinity down a bit more. It’s currently at 1.016, and if I can get it to 1.012 before I move Scarlett, that would be great. I don’t want to “shock” her with too big a salinity jump from her current tank to the nursery.

So again, we march through “expectancy.” 🙂

The Post – Odd Goings-On in the Fiddler Tank – Is Scarlett Acting Pregnant Again?

March 16, 2008

When I first I walked by the fiddler tank yesterday morning, I was sleepy and oblivious. Then I did a double-take. Sitting at the front of the tank was the discarded molted shell of somebody. On closer examination, and with my husband’s consultation too, we both agreed it was Melanie Hamilton’s discard. That means she is at the moment most likely to get pregnant if Admiral Byrd invites her in.

At the same time we noticed that Scarlett O’Hara was sitting on top of the water filter….again. The last time she did that, we noticed shortly afterward that she was pregnant.

Admiral Byrd of course, was marching up and down the tank, claw arm held high, and waving.

To continue – Scarlett O’Hara spent the entire day and evening yesterday, on top of the water filter. She is still there this morning. She has never done that before or since, except when she was pregnant. I know she is still alive because she is “blowing bubbles.” Crabs foam sometimes when they’re out of water, to moisten their gills.

Even when I freaked out Admiral Byrd yesterday, and scared Melanie Hamilton out of her live rock because I was cleaning the tank and accidentally bumped the live rock, Scarlett O’Hara didn’t leave the filter perch. She just moved down into the filter for a bit, then climbed back up. Admiral Byrd meanwhile kept trying to climb the heater power cord up to the top of the filter to be near her, but he couldn’t quite do it with that large claw.

Yesterday afternoon we noticed that Melanie Hamilton remained outside the live rock, sitting there on the gravel serenely watching Admiral Byrd flex his claw. Then she spent the rest of the afternoon and evening in his cave lair. This morning she was resting just outside his lair, picking algae off the rock. He was napping inside.

With any luck, we can try the larvae thing again somtime soon?

I am in the middle of re-establishing the nursery tank. I had emptied everything from the original set-up, cleaned out the tank, put down the one inch or so of the calcium-releasing sand, and added the water. Now I did forget to rinse the sand out, so the tank water was cloudy at first, but it has settle out by now. I’m not sure how one effectively rinses sand out anyway without half of it going down the drain. I will say the white sand really makes the inside of the tank bright when the light is on. If we get babies again, it should be much easier to see them in such a bright tank.

I couldn’t decide whether to make the 3 gallons of water I added marine or brackish. I guess I should start brackish because first we’ll have to move the mom, whichever one of them it is, from their tank, which is brackish into this one. I wouldn’t want to shock them. Right now the tank is on the “marine side” of brackish. I’ll adjust the salinity with a bit more water shortly.

The live rock is back in the tank hopefully doing its thing to establish the nitrogen cycle. Both the air filter AND the bubbler are running and so hopefullly the tank environment will establish itself as quickly as possible. Rather than replace the old water filter cartridge and lose whatever nitrogen-fixing bacteria that had started to thrive in it, I left everything in place and returned it to the tank.

An interesting about the old water in that tank. I tested it before I emptied it out just to see if the nitrite levels ever came down. They read zero, and the nitrates were in the “okay” zone. I guess once I stopped using the live phytoplankton and let the water filter run for a few days, that was what it needed. So the phytoplankton was most likely the culprit in the high nitrites. In any event, I dumped the old water and just started with fresh sea/brackish water all over again.

One thing – that Reef Calcium product that I’d hoped would raise the alkalinity but not raise the pH, when added to half strength Instant Ocean… maybe it didn’t raise the pH but it didn’t solve the problem of the pH being too high from the Instant Ocean even when I used that at half strength. So I still had to use a pH lowering solution and this morning it is about 8.0 vs 8.4 that it was yesterday. So that’s perfect . At least though, the Reef Calcium did raise the alkalinity.

I will keep you all posted on any news from the adult tank. Keeping good thoughts for a new crop of larvae babies. Stay tuned.

The Post: Fiddler Update – From Periods to Commas

March 4, 2008

Just a brief note today – buried in writing work, bills, and car stuff….reality creeps in. 🙂

The fiddler babies continue to thrive. I notice the numbers are down in the tank, and we also noticed they seem to congregate on the right side of the tank, near to the live rock. They swim in and out of the live rock crevices, and some do wander to the other side of the tank to investigate the water filter which is not running at the moment. They probably figure it’s another cave because any babies over there tend to hover under or behind the non-running water filter. But even as tiny guys, they know to keep to shelter.

My husband diligently checks on them with the flashlight and noted that they are bigger…he commented that since birth they have grown from “periods” to “commas.” It will be interesting to see how many survive. The tank is “ocean” level salinity now at around 1.020. I’ll keep it there until the 17th, which will be two weeks “in the ocean” for the guys. About that point I will start doing water changes and bring the salinity slowly back down to the brackish level I keep the adult tank at: 1.010-1.012.

I am keeping an eye on the nitrite levels in the babies’ tank since it’s up quite a bit. I added Amquel to lower the nitrites but I never really see that happen with that or Prime. I sometimes wonder if the solutions to bring the nitrites down are really “placebos” for the owners of the tanks? In any event, monitoring water quality, especially since I’m putting liquid food into the babies’ tank 3 times a day.

The adult tank has been “business as usual” – Melanie Hamilton spends most of her life hiding inside the live rock, Admiral Byrd is ALWAYS waving his claw these days, and about the only difference is Scarlett O’Hara. She must be recovering from “pregnancy and childbirth” because she has NOT stopped eating. She is shoveling in shrimp pellets and picking algae off everything, with both claws at once. She gives “two-fisted eating” a whole new meaning. It is non-stop, almost “frantic” in its intensity. I guess she is making up for lost time and nutrients. Otherwise, she seems fine.

That’s the goings-on today. Working on the next Under the Pier installment, hopefully to be done for tomorrow. Need to finish some chapter revisions first. Stay tuned.

The Post – My Husband, Alias Fiddler Crab Midwife

February 28, 2008

Again I will note, it is my husband who thought of something crucial. I’d finally gotten the new tank so the water is clear, the nitrites aren’t too high, Scarlett O’Hara is calm and exploring the tank. I got the main tank’s water changed, so it too is in great shape. Feeling satisfied with the world, I commented that now all we need to do is wait for the birth.

My husband turned and said: “I’ve been meaning to ask you something that bothered me. You have the water filter running in the nursery tank. When the microscopic babies are born, won’t they all get sucked into the filter material?”

“OH MY GOD.” The man is right. We’ll come down some morning and Scarlett will have delivered and there’ll be no babies in the tank – just this primal cry of the thousands emitting from the cloth and charcoal filter material – the crab baby equivalent of “Oh the humanity!!”

I first thought maybe I could just pull out the filter material and just leave the water pump running, but again, my engineer husband said, “Well that will be okay I guess while they’re microscopic. But what happens when they start to grow and get a little bigger? They’ll get sucked through the pump and won’t that grind them all up?”

“OH MY GOD again.” You know, for a person who started this whole thing out with “So, we’ve spent $4 on fiddler crabs and a $100 on support gear,” and laughed at the endeavor, he is the one the babies should thank if they make it because he is the one paying such close attention to their every need. When I hedged about spending yet another $30 on a tank heater, he was like, “But won’t they need heat?”

In any event, I ran to Petsmart to buy a tank bubbler. There’s all kinds – wands, rocks, bars, then there’s pumps – all kinds of those, not to mention you have to buy the right pump to handle the volume of your tank and the right sized wand to stretch across your tank, then there’s the check valve you have to install if the pump is going to be below the aquarium instead of above it – keeps the water from backflowing into the pump in case of power loss….you get the picture. I finally settled on a pump for aquariums up to 20 gallons instead of 10. Wanted something with more power to push air in there. And I selected a wand to extend across the back of the tank to create a curtain of bubbles. I thought that might circulate the oxgen better than a bubble rock. It won’t filter the water, but hopefully the huge live rock and the bacteria I’ve already seeded the tank with from the old filter backing, will be enough to jump-start the nitrogen cycle without the filter running. The bubbler will give them fresh air. So, keep your fingers crossed.

At least Scarlett O’Hara seems to like it. She climbs up on the wand and sits there with bubbles flowing up around her. I hope she thinks it’s “surf” and releases the babies soon. My husband wonders if she is scurrying around the tank so much because it’s getting close and she’s frantically trying to find that right spot to let them go and be carried out “into the open ocean.” Sigh.

Truly, those fiddler babies owe him a lot. He is the true fiddler dad. Admiral Byrd may be oblivious and not care, but my husband surely does. It’s that whole “Caring is Catchy,” thing.

The Post – How Long Do Fiddler Crabs Stay Pregnant?

February 23, 2008

I spotted this question on a Google search and decided to follow up on it. It has been the question in our house – Scarlett O’Hara seems to get bigger every day with the larval crabs she’s carrying. How long will she carry them? What will she do with them? I’ve learned that female fiddler crabs usually like to hang on to the babies until the right set of tides and conditions so that their babies will be carried out to the open ocean. Apparently they do this because the larval crabs stand a better chance of finding food, and of not becoming someone else’s food, out in the open ocean. That gives them the best chances for reaching adulthood.

The question in our minds here is: we have no outgoing ocean tides in the “aquarium estuary” so when will she release them?

We’ve noticed she keeps hanging out on top of the water filter. In fact yesterday she was deep down INSIDE the water filter. She’s also been ripping the filter backing apart and eating whatever she’s pulling off the fibers. Since fiddler crabs like to eat a lot of microscopic algae, I assume that’s what she’s found. I keep wondering though, is she going to release her babies in the “currents of the water filter?” If so, I wonder how she will decide which currents are “outgoing tide” to that imaginary open ocean we don’t have. 🙂

Anyway, two good articles I came across in my search:

1) When ‘in a pinch’ won’t do: Ultra-picky female fiddler crab cited in UCSD (Univ of California at San Diego) study.

Apparently the female California fiddler crabs are VERY picky about their mates and have REALLY high standards for what kind of “house” the male is offering them. On average the female passes up 23 offers before finally selecting a male. In one case a female passed up 106 offers before choosing her mate. Now…I don’t know who to be more impressed with – the female fiddler crab who passed on 106 males before choosing one? Or the human researcher who followed this female fiddler crab around and kept track of how many males she turned down before choosing? In any event, an interesting article on the life cycle habits of the California fiddler crab.

2) The SC and C FAQ Database: it has a large number of questions and answers about crabs, shrimp, and crayfish. Question # 16 is about 3 pregnant female fiddler crabs and how long their gestation period lasts. Apparently in an aquarium, the female will release the eggs in about a week. We shall see. …Also it has information on what to feed the newly released babies, which might actually let them survive in an aquarium and grow to adults. Hmmmm 100,000 grandchildren. Needless to say my husband is thrilled with the news we might actually be able to help the babies survive in a tank! 🙂 Now all I need to do is find micro-plankton, like Infusoria, to feed to them…..

The Post – Admiral Byrd was NOT Worshipping Me or The Aquarium Light

February 11, 2008

Over the last 2 days my husband noticed that Admiral Byrd has been spending a LOT of time, meaning almost ALL of his time, up on top of the gravel hill or the decorative cave rock, or the live rock, or just about anywhere else in the tank, waving his claw. He looked so funny up on the cave rock. He seemed to be staring up at the aquarium tank light, waving his claw as if paying homage to a god. We figured either he held the aquarium light or my hand in high esteem.

My husband has joked that he thinks the crabs go inside the live rock so much because it’s actually their holy site. He thinks they’ve cobbled together a crude altar made of gravel and on the altar they’ve fashioned a shrimp pellet image of their deity, the hand that feeds them . . . basically mine. As he put it, imagine that every day a hand comes down out of the sky and places steak or shrimp or pancakes in front of us. That’s what it must be like every time my hand drops algae or shrimp pellets near them.

In any event we weren’t sure why Admiral Byrd decided to spend an entire day paying homage to me or the light. Why all of the sudden? There’s been nothing new going on in the tank otherwise, all three crabs have been actually pretty placid, out and about feeding, and generally happy. Was this some sort of designated crab “Holy Day” that just happens to coincide with Lent?

As it turns out, alas, neither the aquarium light nor my hand are the object of Admiral Byrd’s devotions. Melanie Hamilton is.

From the Fiddler Crab page on the Chesapeake Bay Program’s bay restoration site:

“When looking for a mate, he stands near the edge of the burrow, often alongside a string of other males and their (similarly well-maintained) burrows, while the females, returning from foraging, walk past. The male waves his large fiddler claw until he attracts the attention of an interested female, who then stares at him for a short period.. The male resumes his claw-waving, and if the female remains receptive, the male runs toward her, then runs back to his burrow, and repeats this motion several times until she either moves on or follows him to the burrow. ”

Apparently, mating behaviors take place not just when the female forages, but also when she molts. I happened to notice this pale, upside down body lying under the water filter this morning and immediately my heart hurt. I thought “Oh no! Melanie Hamilton died!” But not so. Looking closer, I saw that it was the pale ghost of Melanie Hamilton. It was that eerie translucent white, like Scarlett O’Hara’s was, though much more petite given that Melanie Hamilton is so dainty. Melanie Hamilton sat right behind it. I would have gotten pictures for this blog but she had tucked herself and her tiny ghost so far under the water filter that I could not get a shot. If only I had fiber optic cable, maybe I could get footage! I have concluded that the fiddler crabs have designated the “under the water filter space” as the “molting place.” All 3 have used it now. I think it has enough stretching room to shrug off the old shell, but is sheltered enough to keep everyone else away while their new shell hardens.

Admiral Byrd of course, was well aware of events in the tank. He was standing just a few inches from the water filter hoping to catch her eye. Alas, while Admiral Byrd is a true romantic and his efforts were truly heroic – I mean he has to be exhausted after almost 24-hours straight claw-waving – Melanie Hamilton is having none of it. She has turned her back on him and remains secluded under the water filter.

But anyway, the mystery is solved. Admiral Byrd doesn’t give a darn about the tank light or the hand that feeds him. He apparently can sense the approach of “molting” and was doing the crab Valentine’s Day equivalent of serenading his lady.

Sorry no pictures, though. I told my husband if he ever decides to spend money on expensive jewelry or clothes for me, I would prefer one of those borescopes like they use for colonoscopies. That would work GREAT in the tank for closeups of everybody! 🙂

Coming up this week:

Now that you’ve gotten to know me a bit – a cross between sea life maniac and soulful – I’ll start to introduce some of the projects I’m working on. I’ll share what I’ve done, what I’m doing and where I see myself going. Children’s writer and illustrator, Uri Shulevitz, described three stages of a writer’s development at a conference about 12 years ago. I’ve kept them as a kind of road map in my development and will use them to describe what I’m doing.

Also to come, a Writer’s bio page of what I’ve already written.

Happy Monday!