Are there any negative impacts on the natural ecosystem from farm raised fish?
Fish farming was created as an alternative to over-fishing in natural environments, which was causing an upset in the existing eco-system and surroundings. In the long term, fish farms could prevent the deaths of other marine life by leaving the existing eco-system undisturbed. There have been some research showing that farm raised fish are known to have higher contents of cancer-causing PCBingredients due to the type of food they were being fed. PCBs are contaminants that are a byproduct of toxic waste sites.
Yes. Many cetaceans – whales, dolphins, and porpoises – are sometimes harmed or killed by commercial fishing in the wild. The get entangled in nets and lines or caught on trawl net hooks, including ‘ghost nets’ that have been lost or abandoned. This by-catch (as cetaceans usually aren’t a fishing target) is increasing in frequency and intensity. In addition to that, there’s the indirect effect of depleting fish stocks that they rely on. Other marine mammals, such as dugongs & manatees, seals & walruses, otters, and polar bears, get hurt in these ways well.
Fish farming, on the other hand, does not reduce wild fish stocks and, obviously, does not use nets in the wild to catch fish.
Actually, it is my understanding that the fishmeal fed to most farm raised carnivorous fish (including salmon and shrimp) is made of wild caught fish. So, farm-raised fish do impact fisheries and can be directly connected to bycatch. This fishmeal is both made from waste products of the conventional fisheries as well as from whole fish that are caught solely for this purpose. It is quite concerning and I would encourage you to read more about it on the first link below.
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