Amano hatch rate

Cory · Post by **Cory** » Tue May 03, 2005 2:53 am

I still poke my head in a every month been getting less and less since I got out of my boring job. I thought i could find some advice on hatching parameters for amano eggs.

I've had 3 amano's for about 6 mo. and the female finally decided she'd carry some eggs. I caught her and the eggs were dropped 4/23 but had a weak hatch rate. I have 5-15 amano larva swimming in a salt tank for about a 1.5 weeks feeding them phytoplex from kent. The female emerged w/ another batch 5/1, was hopping to get better than a .2% hatchrate. I hopefully tweaking the PH or temperature will do the trick, this time we were at PH6.9 and 78F. I'm thinking both lower, but i didn't go hear the talk at AGA either.

SCMurphy · Post by **SCMurphy** » Tue May 03, 2005 8:12 am

The talk didn't happen at the AGA. There are two articles I have seen on the web that talk about how to keep the larvae. Try a Google search, I don't have the links around to give out. I do remember that the guy who was successful seperated the mother before the eggs hatched and put the larvae into near full strength sea water ASAP. This is a vague memory though and should be researched.

Larry Grenier · Post by **Larry Grenier** » Tue May 03, 2005 9:33 am

Sea water normally has a much higher pH so maybe something to think about. Check these out.

http://mikes-machine.mine.nu/breeding_yamato.htm

http://www.uniquaria.com/articles/amano.html

Cory · Post by **Cory** » Tue May 03, 2005 3:08 pm

As the larva hatched i pulled them out of the FW/QT dish and into a SW tank using a plastic pippet. They dont seem to mind the treatment, I however can usually only find 1-8. I hope they lie on the bottom in some undissolvable salt very white salt. I think the 4/23 batch is basically spent, i still have 20 or 30 eggs but i dont think they will hatch after this much time. I expect to loose 75%, so maybe i get 4 shrimp for this effort.

They all ignore parameters...maybe an issue w/ pollution...seems from these articles that the dropping of the eggs is insignificantly distant from the hatch. i'll get it right by the end of the summer. The addendum 5 link has an english mirror off the home page if you don't read french. It says basically the same thing mike does though w/ some extra setup pictures and feeding advice.

Post by **krisw** » Tue May 03, 2005 3:17 pm

You might try removing the female when she's carrying eggs. Then, when they hatch, just add a bit of salt each day until the sality reaches the desired level. (Make sure to remove the female before salting) Of course, different source recommend different sality levels.

Disclaimer: I haven't breed these guys, but this is one of the things I've read to do...

Cory · Post by **Cory** » Tue May 03, 2005 5:44 pm

The problem w/ adding salt directly to the tank for mysid stage shrimp would be dissolving the salt. I'm not sure if this is always the case my salt is about 3 years old. It took about 6 hours to get a clear solution of Instant ocean using a 150gph submersible pump, and then i left it for another day to make sure my salinity didn't change. If the articles are right and increasing salinity would decrease hatchrate, this weeklong hatching I had would have been a bit worse-not sure that's possible.

I removed my female to a plastic QT dish that i allowed to float in the main aquarium, so to save me an extra light and heater. In dealing w/ more than 100 of these little critters i would do just what your saying more or less, that'd be fun to pippet. I'd still prepare the salt tank separately and then dump the contents of my "QT dish" into the salt tank. I'll recapture the female 5/18 probably so she can drop the eggs around 5/25.

Larry Grenier · Post by **Larry Grenier** » Wed May 04, 2005 10:02 am

This is very cool Cory. Your experience is great for you and hopefully can benefit others. Keep it up!

Post by **krisw** » Wed May 04, 2005 10:12 am

Hi Cory... What about dissolving a bunch of salt water in a 5gal bucket with an airhose. Then, your tank will start with freshwater. First day, remove half, and replace with salt water from the bucket. Next day, repeat. After a few days, the salinty in the tank should match the bucket. Just a thought. Regardless, I'd love to hear your results at an upcoming meeting sometime. (Meeting topic idea, hint, hint, hint...)

Cory · Post by **Cory** » Sat May 07, 2005 8:01 pm

I'm debating how i want to do waterchanges i dont like what i've done so far. The process feels clumsy, just not used to mixing salt. The initial move to SW isn't as big a deal, you can dilute saltwater that's x2 the conc. of normal, or change the salinity of the FW that they hatched in. Only issue is unhatched eggs dont have a chance to hatch in SW, from my own and other's observations. I am a big proponent of finding something that works for you.

Need to talk to the saltwater people or someone who has know how. On one of the sites a guy uses a 1g aquarium to develop a phytoplankton culture, that feeds the mysis stage shrimp through the first 30-45d until they are ready to go back into freshwater and assume a life much like the easy to breed neocardina sp. would. If i could start a phytoplankton tank when the female berries up and have it develop enough to support 200 shrimp ... well that'd be ideal. I just dunno anything about phytoplankton cultures cept they cost alot. I'll find the local SW club tomorrow and see what i can drum up.

Aaron · Post by **Aaron** » Sat May 14, 2005 12:27 am

Here is another article that has some promising information on amano breeding. http://caridina.japonica.online.fr./English/Elevage.htm

Amano hatch rate

Amano hatch rate

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