Earthworms?

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It's a valid question.

Anyone have an example of harmful effects of feeding a fish a earthworm from dirt treated with pesticide?

I fee my fish earthworms, superworms, red worms, meal worms, etc. Some I buy some (from the bait store... I don't support Wal-Mart) and get some from the yard (I don't use pesticide or fertilizer).

FSM;3371221; said:
I've read about biological magnification, where toxins build up in higher levels of the food chain, but is there actually any data that shows worms that come from a yard treated with pesticides can potentially have detrimental effects on fish they're fed to?

Unless you feed them very often, I doubt it's anything to worry about.
 
This is hella old but i thought i'd be worth a bump to seek out the answer to the question posed.

Is there any proof of fertilizer having an impact on a fish's health?
 
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