Hi,
Another reader asked me to check in on this thread; i've recently retired from the Bronx Zoo, have kept and bred this species for decades. Young ones may gety along, but always a chance of a feeding accident or aggression; as they grow aggression becomes likely...I've kept pairs in very large exhibits with plenty of sunken logs, etc to break up the area, but still a bit risky; breeding always requires close monitoring.
Chunks of fish are not an adequate diet. Whole fishes with bones, internal organs essential; fish peices can be used in a pinch, on occasion, but are never used as a food source in prof collections. FW fish best, marine fishes (mummichugs, shiners) ok on occasion. Long term use of goldfish has been associated with liver/kidney problems; first ID'd at Bx Zoo with mata matas. Shiners, bait minnows, mollies, platies etc all fine. Try whole shrimp also, uncleaned best (can get from a fish market).
Cleaned FW fish from a human food store (tilapia, etc) better than just pieces...feed head, mid body, tail section on sep days if need be; organs missing but a decent option. Trapped/seined local fishes ok; crayfish and FW snails excellent, earthworms sometimes taken by youngsters; parasite transmission raised by some, but we've not seen that at Bx Zoo..there are pre-treatments if you prefer, methylene blus, etc...let me know and I'll look into it.
Many zoos and private individuals feed mice/rats w/o apparent ill effect, and field research shows they do take mammals; I prefer to limit, as digestive system has evolved to process a fish-based diet. Pinkies would be ok on occasion for young ones; I'd stay away from furred rodents. Chicks ok on occasion.
Never known any to refuse whole fish after being kept hungry for a time...fasting will do no harm; better in long run to get animal on a sound diet. Try trout chow and commercial
turtle pellets as well. May need to fast turtle for some time before it will try pellets, but worthwhile as Zoo meds, standard trout chow have all been used with good results, mazuri makes a large turtle chow which can be used as they grow.
Articles below have photos of myself with a 206 lb male...as you see, you'll need to start planning their enclosures !: Please let me know if you need further info, enjoy, Frank
http://bit.ly/XZt60c (top photo is a common snapper, 75 lbs or so)
http://bit.ly/o3txrc