In short, the paper found, farmed fish like salmon and trout had become mostly vegetarians. Synthesizing hundreds of research papers carried out over the last 20 years across the global aquaculture industry, the latest study was published on Wednesday in the journal Nature.
Why salmon your plate might been?
Twenty years ago, as farmed salmon and shrimp started spreading in supermarket freezers, came an influential scientific paper that warned of an environmental mess: Fish farms were gobbling up wild fish stocks, spreading disease and causing marine pollution.
Does Cargill sell salmon feed?
Naylor serves on an advisory panel on forest protection for Cargill Corp, which sells salmon feed. ).
One common answer is, its most striking finding, though, was about the changes in fish feed, especially for carnivorous fish like salmon, which were traditionally fed lots of wild fish, like anchovies. Between 2000 and 2017, the study found, the production of farmed fish tripled in volume, even as the catch of wild fish used to make fish feed and fish oil declined.
Why do salmon cross the ocean?
According to one theory, it’s all about magnetism. When salmon are young, the theory goes, they imprint on the pattern of the Earth’s magnetic field at the mouth of their native river. Years later, when the salmon head back home to spawn, they home in on that pattern.
Why do salmon follow the magnetic field?
When salmon are young, the theory goes, they imprint on the pattern of the Earth’s magnetic field at the mouth of their native river. Years later, when the salmon head back home to spawn, they home in on that pattern.
After hatching in a freshwater stream, young salmon make a break for the ocean, where they hang out for years, covering thousands of miles before deciding its time to settle down and lay eggs in their natal stream. So how do these fish find their way back to their home river ? According to one theory, it’s all about magnetism.
An even bigger concern is whether being raised in hatcheries somehow alters salmon’s “internal GPS. ” Spawned in tanks, these salmon are released into streams and rivers and account for a large amount of the “wild” salmon that swim in the ocean and end up on your dinner plate.