Now, increased demand for traditional fishmeal – which is made from small species caught in the open ocean – has sent the industry scrambling for alternatives.
The stuff being used to make fish feed is a byproduct of the poultry industry – it’s what is left over after the parts of the chicken consumed by humans and the remains used for cat and dog food have been removed.
So don’t address it to him. Honestly, if you want to correct things he’s saying, just do so like you’re correcting a 20-year old newspaper article. You don’t need to converse with trolls to correct the record.