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A comment on Most sushi fish isn't fresh. Parent comment

Re:Most sushi fish isn't fresh by amag on Tuesday October 17, 2017 @07:17PM (#15495753)
Uhm, well, given that 1kg farmed salmon needs 2kg wild caught fish, there may still be a shortage of fish...
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Re:Most sushi fish isn't fresh by ars on Tuesday October 17, 2017 @10:32PM (#15496462)
Tilapia eat vegetation, you can use them for feed.

Why does the salmon feed need to be wild? Why can't it also be farmed?

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