Posts Tagged ‘hardness’

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 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 – Is Birth Imminent?

February 24, 2008

I will be returning soon to the evolution of my novel, Under the Pier, but given the goings-on here, I have to take some time to tell of events unfolding in the fiddler crab world.

I decided to see if it is possible to raise at least a few of Scarlett O’Hara’s and Admiral Byrd’s babies, should they survive birth. It’s a long shot, but I want to try. Scarlett looked really pregnant yesterday – that abdomen of hers is large and when she pushes at it, it’s like jelly. I have these observations again from my husband.

It is TRUE LOVE when your husband acts as midwife for your pregnant fiddler crab, keeping close eye on her while I ran out today to get a chunk of live rock for the aquarium. He even called me on my cell phone at the aquarium store to tell me that Scarlett was picking at the larval mass, pulling out a brown thread here and there and planting it in the gravel. He felt birth was getting close and I should hurry home with the live rock. I tell you, is that a friend or not? How many people would call you on your cell phone to let you know your fiddler crab is getting ready to deliver? 🙂

To back up, we went to Petsmart last night and picked up a new 10-gallon aquarium, tank top, light, light bulb, thermometer….. yes, another whole set-up. My husband is laughing but then, he is a geek, just one with different interests, so he respects this endeavor I’m involved in.

In fact, he is working on setting up his own blog that will have all kinds of tweaky things that reflect his interests. When it’s up and running, I’ll be sure to mention it. He finds the most unusual and interesting things out there. To give you a sample of the man, when we are out on a date it is not unusual to walk through the parking lot and have him explain to me the mechanisms for the inner workings of car backup lights and such. I just love it. Going somewhere with him is always interesting and an adventure. Sometime I’ll have to share how he and I hunted down the overgrown boarded up command bunker for a former Nike missile launch site in Newport News VA. 🙂 But a story for another time. Those are the kinds of dates I love. Anyway, I’ll let you know when his geek site is up and running.

To get back to fiddlers, I spent last night setting up the tank. This time I started with distilled water. We have a small water distiller and I proceeded to use up our drinking supply to make up salt water for the “nursery tank.” Mixed up Instant Ocean powder in the distilled water, set up the filter, and within a couple of hours, got the water parameters just about where I wanted them: pH 7.8, alkalinity 180, hardness >300, chlorine, Nitrite, and nitrates all zero. Salinity was about 1.008, a little lower than I wanted because I want this tank’s water to be an almost exact match for the main tank.

This morning I used some marine buffer to bump the pH up to 8.0 and alkalinity closer to 300. Added a bit more Instant Ocean to get the salinity up to 1.010. I seeded the new filter with a strip of “very well colonized” filter material from the old tank to jump start the nitrogen cycle, and brought home from Fish Pros the MOST amazing chunk of live rock – ALREADY had all kinds of marine invertebrates and microscopic algae on it because it had been in another tank that had just been dis-assembled. So, the live rock is well underway growing organisms and probably has another dose of nitrogen-fixing bacteria ready to go.

I debated about what to do with Scarlett O’Hara, leave her in the old tank and struggle with where to release her babies or put her in the new tank with plenty of room for all. Finally decided to take a chance and I’ve moved her into the new tank. She seems to be doing okay in spite of being rattled by being moved. I’m hoping it didn’t disturb her too much. It always shakes them up a bit to move them around. I have done my best to make her a good nursery and here she is free from Admiral Byrd’s claw-waving. I even took the heater from the old tank and gave it to her in the new one. I ordered a new heater for the main tank which should be here Wed. But I figured Melanie Hamilton and Admiral Byrd will be fine for a couple days with the tank lights to keep them warm. I figured “momma” needed it more.

By the way, the tank heater I use is a small one geared for 3 gal aquariums. It’s pre-set and can be mounted sideways with suction cups, and there’s no risk if it touches the gravel. It’s a Marineland Shatterproof Heater (10 watts) part number VTMD10 and found it online at That Pet Place.  Since my tanks are only a third full of water (to allow space for the crabs to get out in air), regular heaters won’t work. Not enough water for them to be fully submerged. And regular heaters are generally large and have to be vertical.  This guy is short and can be sideways. Keeps the tank in the range of about 78-80 degrees F. So for what it’s worth.

So…the nursery is up and running. So very much hoping that 1) Scarlett will do okay in the new tank; I would feel terrible if she doesn’t make it because of the move 2) the babies do okay.

Then all we have to worry about is how to sell off many many many many many grandchildren? 🙂 I’ll keep you posted.

By the way, if you want to have a few seconds of just staring at some nice marine creatures swimming amidst coral, click on the Instant Ocean link above. Neat intro.