Sterilizing a crayfish (marmorkrebs) tank
Posted 06 May 2011 - 02:24 PM
So now I have this 30 gallon tank, mostly drained, which I had thought contained only a handful of adult crays, but I'm finding at least two broods of young also. What is the recommended method for sterilizing the remaining contents of the tank? I intend to dump the substrate - lava rock and crushed oyster shell - in my yard. It's far from water, but it's been raining lately and I don't know how far a cray could travel over land.
Posted 06 May 2011 - 02:59 PM
Heck, if you bring it to the convention, you might could even donate it as an auction item... generate revenue for NANFA! Live food starter culture...
...to actually answer your question I would think that two gallons of bleach and enough water to cover the substrate would really kill anything...
Posted 06 May 2011 - 04:01 PM
Posted 07 May 2011 - 06:52 PM
As a word of caution to anyone else keeping these things, predation by fish is evidently fairly ineffective at eradicating them. I ended up finding them in three places. I had a 30 gallon tank which had been breeding them for about a year. This tank has also housed three brown bullheads, which love to eat crayfish, for the last four months. I had seen no sign of babies in a long time (since before the catfish were added). When I took the tank apart I ended up finding 15 or so young, again of two different age groups, and after applying half a gallon of bleach diluted about 50% by the remaining water I again found a half dozen dead that I had missed in two rounds of manual removal.
The sump tank mentioned in the first post was the filter for a 75 gallon tank which housed a young smallmouth bass, a fat sleeper goby, a couple sunfish and a large native cray. When I add small crays to this tank, the bass will eat 6 or more immediately, and all these fish so I assumed that after a few days there would be no survivors. This seems to be the case for wild-caught ones which I would add by the dozens periodically. Upon disassembly I found only the one 3.5" adult native I had known about (an escaped feeder who eventually grew too large and had been in the tank six months or more) and 8 marmorkrebs. I hadn't added any marmorkrebs as feeders in about a month. I see no evidence of a second generation in this tank at least, but three of them appeared (based on size; I don't know how else to tell) to be sexually mature.
Posted 08 May 2011 - 04:52 PM
Posted 09 May 2011 - 11:17 AM
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