Posts Tagged ‘fiddler babies’

The Post – Fiddler Babies Thrive in the “White Cloud.”

March 30, 2008

The white cloud in the babies’ tank continues, yet the water quality is GREAT.

What mystifies me is the absolute ?attraction the fiddler babies have for the aragonite sand and the reef rock. They swarm all over areas of the sand, stirring up clouds of dust, and bouncing down against the aragonite sand, then move on to another area. They are equally attracted to the reef rock, which is nothing more than a hunk of petrified coral.

On the flip side, while they swim by the live rock, they do not seem to be interested in it to any great extent, even though there is a wide variety of algae growing all over it.

The aragonite sand is Seachem’s Meridian Marine Tidal Substrate. The reef rock is “Carib Sea Reef Rock.” Both products help to maintain proper pH and calcium levels, as well as encourage the growth of coralline algae and beneficial bacteria. In fact, I suspect it is the cloud of aragonite dust in the water that may have helped spur the bacteria on, resulting in the nitrite levels in the tank dropping to zero. It just seems counterintuitive to me, to have a tank of water I can barely see through, yet have it be so healthy by the numbers.

I shine the flashlight in the tank and can see thousands of babies swimming around, digging in the sand, or clustering on the reef rock. All are in motion, so they are most definitely alive. I have to wonder if there are already lots of microscopic algae on the surfaces of the sand and the reef rock, and the congregating of the fiddler babies is about eating what’s there.

I am currently feeding them 4 drops of Wardley’s Essentials Small Fry Liquid Food and a 1/4 tsp of Kent Marine’s ZooPlex, 3 times a day. I’m being very careful not to overfeed, and monitoring ammonia and nitrite levels 2-3 times a day.

I’ve also started the live brine shrimp hatchery going, though I have to say, I’m not sure if that’s something I want to deal with on a regular basis. Just one more job I have to do and as one of the sites mentioned, if you can’t get live food, frozen brine shrimp is the next best thing. I know I saw cubes of frozen brine shrimp at PetsMart and I may yet change to that. But for now, I’ll see the “sea monkey” hatching project through and see how it goes. I expect I’ll have hatched brine shrimp by tomorrow so I will try some of that instead of the liquid feeds and see what happens.

Just as an aside, I found a page on About.com that mentions their top picks for “small fry” food.

While these are primarily small fry as in baby fish, they all contain the multitude of nutrients need, and in an accessible, easily digested liquid form for young aquatic creatures. So I’m not too concerned.

Frankly, even though the Kent Marine ZooPlex is supposed to be for larval invertebrates, I have to say I’m more happy with the “dispersal” ability of Wardley’s Small Fry food. Wardley’s is a milky liquid that spreads completely and uniformly through the tank, so the most food and nutrients are available to the most number of critters.

The Kent’s on the other hand, is like ground up bits of brine shrimp in a pink liquid. The instructions say a teaspoon per 50 gallons, and since I’ve only got a 10 gallon tank, I am giving 1/4 tsp of the stuff. However it seems like precious little food, that probably isn’t getting to anywhere near the number of baby fiddlers that are hungry and needing to eat. So at least so far, I’m not that impressed with the Kent Marine ZooPlex and will stick primarily with Wardley’s. From there it’s live or frozen brine shrimp.

I raised the salinity of the aquarium yesterday to 1.017 from 1.012. I’d be happy to get to 1.020, which is close enough to a marine environment. I’ll leave it there for a couple weeks then, and gauge the appropriate time to lower it back down to brackish. I want to match that to the development of the more advanced crab forms from the initial larval stages.

As to the adult crabs – they’re doing fine in the main tank. Admiral Byrd, flush with mating success these days, never stops waving his claw. In fact, yesterday, I no sooner put Scarlett O’Hara back in the main tank, and he was right there saying “hi.” She hid behind the water filter to eat…though not too hidden, he actually lay backwards and slightly upside down on the water heater near her, and waved his claw at her upside down. Talk about “never give up.”

Anyway, so far, so good. We’ll see how this progresses over the next few days. It would be nice to keep many alive to actually make it to adult crab stage. Stay tuned!

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 Gift – Fiddler Extra!!! We’re Grandparents Again!

March 28, 2008

Just a quick post tonight to announce the birth of another 100000 fiddler babies!!!

Mother is doing well and is back in her regular tank. Babies are swimming around like crazy and have been fed some liquid Small Fry food and a few drops of Kent Marine ZooPlex. I’ll give a more full report in the morning.

The Gift – A Fiddler Crab Extra From a Fellow Crab Enthusiast

March 18, 2008

One of our readers sent in some information the other day about her attempts to raise fiddler crab larvae. That comment was in response to my blog post entitled:

The Fiddler Babies are Dead But We’ll Start Over and Prove HorseyhannahWrong.

Yesterday Laurie has this update that she posted on one of my other blog posts: “Extra! News on Preparing the Fiddler Crab Nursery.”

She has such good info, and generously wants to share it with all, so I include it here for all to see.

I especially loved what she said toward the end of her comment, that maybe if all of us who have knowledge on the subject of fiddler crabs pool our info, we can prove that you CAN too raise fiddler babies without the hundreds and thousands of dollars of equipment that Horseyhannah (on the Animal Planet forum) says you need.

So here is Laurie’s information, her gift to all fiddler enthusiasts out there, updating us on her progress and also listing the many things she’s done to make this work. Thank’s Laurie! And to anyone else who might have more info for myself or Laurie, please do send your comments. They are welcome!

Fiddler crab lovers of the world, unite!!! 🙂

Comment:
Laurie’s Fiddler Crab fry–March 17th, 2008, Day 7 and still going…

Just an update. They were released on March 10th and true to the (artist!?) breeder of the mangrove crabs www.aquahoito.info/sesarma/index.html on March 15th, day 5, I had a little more than half die off. In the last 2 days no more have died, tho.
Today I was able to get supplies for them, including a salinity meter ($7.00) and some test strips for nitrate/nitrite etc. and Kent’s PhytoPlex (not live) for more food. As I didn’t have proper food for them I did the newborn fish fry trick of feeding them hard boiled egg yolk. About 1/2 a matchstick head’s worth smashed fine in some water and dispersed with the fry, twice a day. That was too much, no doubt, but I’m new at crabs and they did ok…

I tested my water (2 gallon hex w/no filtration, slight bubbling from airstone) and nitrates were 0, nitrites were alright-“caution” .5 ppm, salt is .015ppm, hardness 300 (ideal). I’m finding it’s cheaper to do water changes in a small fry tank than buy a whole salt water filtration system. 2 tbsp Ocean Reef salt/quart, 1 qt every couple days. The little squirts only have to get to 2 or 3 months old before they’re little crabs, by the looks of Mr. Mangrove Crab’s work, so that’s not much salt used over time versus the complexities of a nitrogen cycle filtration system. Now that I have test strips I’ll know how often that should be.

Again, shutting off the bubbler, wiping the bottom to free the slime that’s growing there (I don’t think I’m getting it all, so if it’s food it’s still present somewhat), then fluffing it to one side and siphoning it up w/airline tubing seems to clean the nitrite creating stuff pretty well. Shining a light in one corner for them to aggregate near keeps most of them out of the way, and I shine it again in the gunk glass I siphoned into to get the ones I accidently sucked up back into the tank.

One interesting note is that after the “D-Day” day 5 die off the herd that is left swims less and congregates on the bottom on the side facing the window. Their movement is now more like a thousand little frogs hopping around in the herd at the bottom of the tank. Some still swim, but majority is doing the new movement. I can see a bit of their tail now, but no major growth change.
Possible theories: 1.) they molted on day 5 and many didn’t make it through. 2.)Nitrites killed them at this stage and they haven’t molted yet. 3.) Maybe everyone’s dies at day 5 because they have 5 days of food stored in them or because when they molt the new contact with water conditions isn’t right for them…
Interesting to note that my water isn’t the right ppm for salt, but half have survived… I thought I saw somewhere it should be ocean water (1.020-1.024, and somewhere else 1.010. hmm. Wish I had more tanks to test all 3 salinities.

My hope is that with more postings from folks that are having success we can all help each other out to solve this mystery and not make silly statements like it taking hundreds of thousands of dollars to get the right water conditions for this. heh heh that one still makes me chuckle. I bet it’s possible.

Folks could try their filtration systems in their nursery tanks with a big ball of fiber-fill around the intake (intake on LOW!) with super fine cloth over that. That makes the drag into the intake almost nothing. You’ll see if the babies are being pulled onto it, it’s too strong still… but I still am having great water results with one gallon of water in a two gallon tank.
Best… Laurie

The Post – Admiral Byrd, A Comforting Constant in Life

March 14, 2008

It’s been a day of taxes and bills and other aggravations…enough to drive any sane person to the comfort of their fiddler crabs. 🙂

Admiral Byrd has been robustly marching around the tank, and no matter if he’s on “gravel hill,” the top of his “fake cave” or perched on “live rock” he stands tall and waves his claw. We just walked back in the house from dinner and the first sight to greet us across the kitchen was Admiral Byrd waving. Now we know deep down inside that he really couldn’t care less about us unless we’re a female fiddler crab, but still, on a tired night we could live in denial and pretend our “pet” is welcoming us home.

On a bit more serious note, I received a great comment from someone about my post on the death of the fiddler babies and how the Discovery forum person, Horseyhannah, said not to even bother trying to raise babies.

This person currently has living crab larvae – day 3 – and she’s offered a lot of ideas from her own experiences. There is SUCH good information and several suggestions for fiddler crab owners in her comments. I wanted to first say THANK YOU! And secondly, for anyone who didn’t catch the comment, just click here to read it.

She noted that she doesn’t use substrate on the tank bottom, which is interesting to me. I have heard others who’ve done the same, so I think there might be some merit to that approach. For myself this time around I will use the calcium substrate, since by the time I got that post, I had already started setting up the nursery tank with the new sand. So I’ll see how the sand “experiment” goes. But still, her approach to not using substrate seems very interesting and if she wants to send any updates on how it’s going, that would be great. I imagine there are many others out there who’d like to know if that is a better way to go. So anyone with info on keeping the tank bottom bare, please do send along your experiences.

I also appreciated her kind comment about my blog postings – re my novel, the fiddlers, and my marriage. Many thanks. To respond to the requests in her comment:

1) – There are many more posts to come on the progress of my novel, Under the Pier, and about life in general.

2) – She asked if I could put all the fiddler crab posts together in one place for all those “crab junkies.” Well, have no fear – they already are. On the right-hand side of my main blog page, under the “Pages” listing, click on the page called:

“And What’s the Deal With All The Fiddler Crab Stuff”

Every fiddler posting is on that page with a live link to each and every post. So crab junkies – have a great time. 🙂

For anyone who is following the progress of my “Author Journey,” or for the process and progress of my novel, Under the Pier, I’ve done the same thing. Each topic has a page with all the posts listed there, and live links to them.

If you should find your way to my blog on a page that doesn’t have the “Page list” on the right, just click on the Soul Mosaic words in my header and it will bring up the main day’s page. Then you’ll see the Page list on the right.

Well, I will re-group tomorrow. It is simply nice to know that in spite of irritating taxes and bills and other life annoyances, there are those constants like Admiral Byrd waving his claw no matter what time, day or night, that you walk in the room.

Happy Weekend to you all.

The Post – The Fiddler Babies are Dead, But We’ll Start Over And Prove Horseyhannah Wrong!!

March 10, 2008

The fiddler babies are dead.

I am sad, because I really did like the fiddler babies. I looked around on the web last night for clues to their demise and that’s when I got ticked.

The Discovery Channel’s Animal Planet Online Forum had a discussion of how to raise fiddler crab larvae. “Horseyhannah,” a senior member on the forum basically told a member who asked how to raise fiddler larvae that it’s so hard and requires hundreds of thousands of dollars of equipment to simulate ocean environments, waves, tides, etc. so it’s really not possible. Horseyhannah told the person to just enjoy the adult fiddler crabs and don’t bother to raise the babies. Needless to say, the person asking the question was polite, said thank you, agreed it will probably be hard, but would still like to know horseyhannah’s info source…just in case she decided to raise them anyway. My answer to that person is: GO FOR IT!!!! PROVE HORSEYHANNAH WRONG!!!!!

In fact, I am determined to do just that. In my book, Horseyhannah has thrown down the gauntlet and I am determined to prove her wrong.

I will concede failure on this first attempt. I am sad as I was so looking forward to having some fiddler grandchildren survive. I was frustrated and disappointed because contrary to the advice above, I think it was not only possible, but it was happening. Because I lost them so quickly, that tells me something overwhelming happened in the tank to kill them all off at once.

To review, by Friday afternoon, there were no babies moving around. It was a rapid decline, and up until that point, we still had quite a large number alive. I have to conclude it was a water quality issue and I think the biggest culprit was the live phytoplankton. But to go through this methodically, let me look at several things. If it were salinity, ie they didn’t like the marine environment I don’t think they would have lived that long in it to start with. I suspect the following things were problems:

1) I used gravel and we did lose MANY babies because they burrowed into the gravel crevices and died there.

2) The nitrite levels in the water spiked suddenly and got very toxic. Thoughts on this point:

a) I didn’t get the tank set up early enough to have a mature and well-functioning nitrogen cycle.

b) I either fed them the wrong food, or too much, or both. The wrong food or too much food meant it didn’t get eaten, sat in the tank and rotted. OR it created a huge algae bloom that raised nitrite levels beyond a tolerable level.

c) I didn’t change the water fast enough once I realized the nitrites were a problem, though given the phytoplankton issue, I was probablly fighting a losing battle from the beginning.

d) I no doubt lost babies doing the water changes because my only option was to bail water out of the tank and pour it down the drain

So boys and girls, what have I learned from this first attempt that can be done better next time?

1) I will use calcium sand not gravel. Aside from the fact that the babies won’t get trapped in the substrate material, the calcium sand will provide enough calcium for the babies to stay healthy during many molts.

2) Figure out the right food and amount. The gentleman from Finland whose article I quoted a few days back (he raised the Red Clayed Mangrove crabs) fed his larval crab Artemia…brine shrimp. He had a hatchery right in the tank to have a fresh supply. He also used something called JBL Nobilfluid for when the larvae were too small for the brine shrimp. This product is probably similar to the Small Fry liquid food I was using. It it made by a company in Germany and I’m trying to find out if it is marketed here. It has 50 different vitamins and minerals as well as brine shrimp and is geared for newly hatched aquatic animals too small to tackle live brine shrimp yet.

3) DON’T USE LIVE PHYTOPLANKTON this time. In spite of an almost 50% water change, I could not get the nitrite levels down. In fact, they kept rising. Now I am finding information that phytoplankton excrete nitrites. The better the phytoplankton did, the higher the nitrites. And with each feeding I basically inoculated the tank with more. I created my very own algae bloom which released such high nitrite levels, the babies were doomed.

Frankly, the tank seemed to be doing okay until I started using the phytoplankton. I would feed the liquid Small Fry food and while the tank would be cloudy initially, it cleared quickly, telling me the babies ate the food. At that point, in spite of it being a new tank with an unestablished nitrogen cycle, the nitrite levels stayed pretty low. However, once I started using the phytoplankton, the tank got cloudy quickly, the nitrite levels spiked, the water had a greenish tint, and the larval crabs numbers dropped dramatically. So, NO phytoplankton.

4) For water changes, instead of bailing water out, I will use the water bubbler as my “filter” to keep the babies in the tank, and let gravity siphon water out of the tube. I have the bubbler’s pump set up beneath the tank and have a regulator valve in the line to keep water from back-flowing from the air bubbler, into the pump. If I remove the valve and let the tube sit in a bucket, it will slowly siphon off water through the bubbler. This should let me slowly get water out for changes, without bailing larval crabs out of the tank and sending them down my kitchen drain.

So. I will start over. Admiral Byrd is doing his part, trying to get Scarlett O’Hara to notice him. Scarlett O’Hara has been eating and hanging around Admiral Byrd’s cave den. I figure it’s only a matter of time before Scarlett has eggs again. Therefore, tomorrow, I will take down the nursery tank, clean it out, get some calcium sand, and get that tank up and running again with the live rock in it, and get that nitrogen cycle stable.

We are going to try this again! My husband and I would love some fiddler grandchildren, 🙂 and even he said that we must prove Horseyhannah wrong!!! Stay tuned.