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Fish eat prawns every day and are fine. I fed prawn to most of my fish on a daily basis for years and never had a problem. The only reason to be wary when feeding prawn/ shrimp to aquarium fish, is if you have live shrimp in the tank. If you do have live shrimp, then you should use cooked prawn for the fish so no diseases get introduced to the shrimp in the tank.Prawns should not be fed to fish. They contain thiaminase, which breaks down vitamin B1 (thiamine) which will lead to all sorts of issues if fed too much, including poor growth.
If you’ve been using the little frozen ‘prawns’ we use for prawn cocktails and prawn sandwiches, they’re not prawns, but a species of shrimp. Shrimp are safe, prawns are not. Those little ‘prawns’ are pre-cooked, btw.Fish eat prawns every day and are fine. I fed prawn to most of my fish on a daily basis for years and never had a problem. The only reason to be wary when feeding prawn/ shrimp to aquarium fish, is if you have live shrimp in the tank. If you do have live shrimp, then you should use cooked prawn for the fish so no diseases get introduced to the shrimp in the tank.
Where did you get the idea that prawns contain thiaminase and shrimp do no not? For that matter I was of the understanding that shrimp and prawn are virtually synomonous, the different words referring to size, but different cultures use them differently. British (and commonwealth) english uses "shrimp" for small and "prawn" for large. American english uses "shrimp" as a more catchall.
https://www.practicalfishkeeping.co...ed-to-know-about-predator-fish-and-thiaminase says that thiaminase is found in cyprinid fish, mussels, and crustaceans
Both shrimp and prawns (which are common name classifications not scientific; both are decapods as are crabs, lobsters and crawfish) are crustaceans. In fact, a fish fed on nothing but brine shrimp and/or daphnia might also have problems.
Thiaminase will probably be destroyed by cooking, but it also probably destroyed all the thiamin in the food before cooking.
Regardless, shrimp and prawns should not be the main diet. I think the main issue about thiaminase is that feeder goldfish are a really bad choice of live food.