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Fish farming is causes other problems too. Water is diverted and lakes altered to accomodate them, plus escapees getting into new environments. And then there's the food which has to be caught, transported, often processed and then fed. There's a lot of transport miles in farmed fish...

The only thing is a lot of fish aren't sustainably caught in there wild environments and their harvesting isn't managed well, if at all. Some populations can't sustain regular harvests as they aren't as fecund as Cardinals either.
 
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