I would strongly caution against a fish-only diet for these reasons:
1) You always want to try to replicate an animal's natural diet and a fish-only diet is not natural for indigos; in fact, it probably represents a very small portion of their diet. These are generalist predators and they are far more likely to consumer higher proportions of rodents than fish in their natural element. Fish can represent a small part of an overall balanced diet (I feed primarily mice and rats and supplement with quail and very young rabbits).
2) ODOR: you will find that the feces will be very runny and have a horrific odor...that's enough to not feed a fish only diet
Hope this helps,
Rob Carmichael, Curator
The Wildlife Discovery Center
>>Got a question for you all. I don't have a dry yet, but have been reading this board for all the info prior to purchase. I see where people scent mice, etc. with fish. If you have a good supply of fish, could you feed them fish exclusively? This might sound like a stupid question, but just wondered. I live on a lake and would have a great supply of fish...bluegill, catfish,etc. Just wondered if anyone fed them things besides rodents. I have also read people feed em chicken, etc. Thanks, John
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Rob Carmichael, Curator
The Wildlife Discovery Center at Elawa Farm
Lake Forest, IL