thermofish Posted December 16, 2003 Share Posted December 16, 2003 maybe this post should go in 'technical' ...anyway Over the last week ive have a few of my yabbies die.I had about 10 yabbies (about 5-6cm) in a 2 foot tank with wood & rock to hide among. 3 of them have just curled over and died so far with no sign of injury.pH is 7.5no nitrite or ammonia.about 6 hours of light a day.water temp bounces from 20-23degreesim trying to get them to breed for food for my americans but things are not looking good.what am i doing wrong??any suggestions would be greatly appreciated.cheers. Link to comment Share on other sites More sharing options...
Guest Gutty Posted December 16, 2003 Share Posted December 16, 2003 No idea why they are dieing, but a bit more light might help them breed more. so i've been lead to believe anyway.............latamatt Link to comment Share on other sites More sharing options...
edward Posted December 17, 2003 Share Posted December 17, 2003 they probably been killed.10 yabbies of that size in a 2ft is a bit cramped.Do they still have their claws in-tact? Link to comment Share on other sites More sharing options...
anchar Posted December 17, 2003 Share Posted December 17, 2003 Maybe the 30 odd degrees is too warm for themmerjo Link to comment Share on other sites More sharing options...
thermofish Posted December 17, 2003 Author Share Posted December 17, 2003 The yabbies are small the tank wider then normal and they have plenty of territory to call there own, still it is a bit cramped but i dont think it would make the odd yabbie just drop dead.They have no sign of being in a fight and i have never seen any of them fight, they have claws intack other then the ones i got already without claws.I havent spotted the tank get above 23degrees. So its a bit of a mystery. Link to comment Share on other sites More sharing options...
Go Fast Posted December 17, 2003 Share Posted December 17, 2003 Have you got any oxygen/air getting pumped in there?MC Link to comment Share on other sites More sharing options...
Adam Posted December 17, 2003 Share Posted December 17, 2003 Well my bets are either low DO, but you would normally see the other crayfish acting up if this was the problem. Or moult death syndrome. A percentage of all crustaceans fail to survive the process of moulting, its the reason that they don't rule the world. Did they have to shells? or part of the shell lifting up? The final one is usually the most common in home fish tanks and that is someone either used insecticide near the tank or didn't wash off some that they applied to keep the mozzies off. Normally you'd get a total kill, but sometimes you will kill just a few.Adam Link to comment Share on other sites More sharing options...
wui39 Posted December 17, 2003 Share Posted December 17, 2003 I don't know about breeding them but when I was working at Sydney Aquarium they use to put them in as food for the platypus. They were at least a hudered in there and they seemed to be fine. Maybe there is a diesease goinf through the tank. Link to comment Share on other sites More sharing options...
thermofish Posted December 17, 2003 Author Share Posted December 17, 2003 Filtration is cool, air is going in, it must be some kind of disease but god knows.I'll see if i get anymore deaths over the next week and try to look out for signs of disease. If they keep dropping i might have to disinfect my tank or something.I chucked some frozen tank water in to try and drop the water temp even lower as well. They look active and healthy. anyway, i'll keep a close look and update with any news.cheers. Link to comment Share on other sites More sharing options...
edward Posted December 17, 2003 Share Posted December 17, 2003 23 degrees? I don't think they need water that warm?I thought 18 was optimum for them? Link to comment Share on other sites More sharing options...
urodacus Posted December 17, 2003 Share Posted December 17, 2003 I think copper is toxic to aquatic invertebrates, have you used any copper based treatments in that tank? Could be wrong here, think it was something i read on a marine site. Link to comment Share on other sites More sharing options...
Mudrat Posted December 17, 2003 Share Posted December 17, 2003 What type of yabby is it?. Is it the common cherax destructor, or a redclaw or marron? or something else?Is there any furryness around the tail? Link to comment Share on other sites More sharing options...
Alan Posted December 17, 2003 Share Posted December 17, 2003 I would have thought that 23C was just about spot on for spawning most of the cherax species, even C quadricqarinatus.http://petsforum.com/personal/svoorwinde/yabby/index.htmhttp://www.mackers.com/crayfish/http://crayfish.byu.edu/faq.htmTohe couple of sites might give you a bit of an insight as to what is going onAlan Link to comment Share on other sites More sharing options...
edward Posted December 17, 2003 Share Posted December 17, 2003 Hi Alan and all.Sorry, my 18 degrees is WRONG.I asked my gf who has a few tanks of yabbies and even went to borrowa few books from the library. She says anywhere between 22-26 degrees is fine.My apologies.Ed Link to comment Share on other sites More sharing options...
thermofish Posted December 18, 2003 Author Share Posted December 18, 2003 Ive just got common cherax destructor.No more have died...yet. Still cant see any signs of disease.I'll just keep observing them and see what happens.cheers. Link to comment Share on other sites More sharing options...
Alan Posted December 18, 2003 Share Posted December 18, 2003 You sure they were dead animals Thermo and not casts. C destructor can be propper buggers for eating thier mates when they cast thier shells and are still soft.Easy way to tell is if the "body" has eyes. If the eye sockets are empty then it is a cast shell and the old owner may have been invited to dinner.Alan Link to comment Share on other sites More sharing options...
thermofish Posted December 23, 2003 Author Share Posted December 23, 2003 They were dead alright and hadnt cast recently.All seems ok now, havent lost anymore other than a trouble maker i fed to my Cuban. Beats me what its was that killed the others.Now if i can just get them to breed !!!!cheers. Link to comment Share on other sites More sharing options...
E4G13M4N Posted December 24, 2003 Share Posted December 24, 2003 Even though they are only 5-6cm the three that died may not have been able to set up there own territory.. As you say you have fed off a trouble maker so its possible due to his/her harrasement they couldnt cope with it.. I dont think it would be malt syndrome as its unusual to have 2 die from around the same time.. I think it was more stress related... I have seen yabbies knock em self out and drown trying to keep away from the bully.. Link to comment Share on other sites More sharing options...
mezzacam Posted January 22, 2004 Share Posted January 22, 2004 Best thing to breed yabbies in... is in a old Bath Tub in the backyard... Never done it but my friend has a bathtub he found up bush in his backyard filled with about 70yabbies he also caught from up the bush.... I dunno how it's going so far ... but you'd never catch me picking up one of those suckers... nasty buM claws.. scary.. anyhows. Just thought i'd say it. Link to comment Share on other sites More sharing options...
Marc_80 Posted September 1, 2006 Share Posted September 1, 2006 hi guys just a quick note. 23 degrees is perfect just about sounds like you might need a bit more room and i would have another tank ready to put the mum into on her own then once the babies drop off get her out and fed them baby lquid food (fish) and then the next best thing as this works for bredding them and raising them get a tin of bake beans and rinse the sauce off and just put in some beans, when i use to breed them in a 4foot tank 5 pairs and ab0out a tin of bake beans a week never had a drama but i always took the female out hope it helps marc Link to comment Share on other sites More sharing options...
MattR Posted September 1, 2006 Share Posted September 1, 2006 15'C and up apparently You definetly have males and females? do you know how to sex them? Holding female yabbies are very sensitive, if she doesn't like being disturbed the eggs will just not hatch, or she will drop them. out of interest, did you know there are hundreds maybe even thousands of different types of yabbies? heres a good article. http://www.dpi.vic.gov.au/DPI/nreninf.nsf/...CE00190D8A?open Link to comment Share on other sites More sharing options...
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