Feeder tank has its water level constantly fluctuating, not a good place if you are a fish.. this is where I decide to get the Crayfish, sometimes they were called Crawfish, Crawdad or even fresh water lobster. Not sure its same as Yabbies as in Australia.
Just received few to tryout and lets see ... these are easily breed and in feeder tank they should be okay with water not full all the time.
Just learned from the person that provide these crayfish. Looking at photo below the top crayfish is female and the bottom is male the different is in the circle. The pincers with reddish colour is male and without is female. Lots to learn on this crayfish, especially how to take care of them.
Next would be breeding these crayfish and produce for self use.
Few of the crayfish hiding in pvc pipes.
Need to remove most few more Tilapia and leave only a handful to ensure mosquito is under control. Crayfish don't eat mosquito larvae.