Two recent reports have both warned about the state of the world fish population. "Hungry Oceans" by environmental group Oceana warned that the growing trend of eating smaller "prey" fish such as herring and squid is depriving larger "predator" fish of their food, who are already threatened by overfishing. The UN report said that aquaculture may not grow to meet demand and their declining fish stocks pose a potential problem for humans. Both reports warned of the effect of climate change as it could lead to migrations and fish populations can collapse during warm periods.

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