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At Yellow Island Aquaculture on the Pacific Coast of British Columbia, Canada, floating net cages are used to raise farmed salmon. One risk with using net cages is that farmed fish occasionally escape their pens and invade the spawning grounds of native species, endangering indigenous Pacific salmon populations.
Photo credit: © 2004, YELLOW ISLAND AQUACULTURE LTD.
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Giant blue fin tuna are one of the most magnificent fish in the ocean -- and one of the most prized catches in the seafood industry today, due to the growing demand for sushi worldwide. Off the coast of Spain, wild tuna are caught in nets along their migration routes and transferred into net cages for cultivation (left). There is controversy over whether these tuna are being counted against the maximum allowable catch.
Photo credit: © 2004, ATUNES DE MAZARRON
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Farm-raised fish and shellfish are being sold at restaurants and markets across the country. But with a study showing that samples of some farmed fish have significantly higher levels of PCBs and dioxins than species in the wild, there are questions as to whether aquaculture is producing a safe alternative to wild fish.
Photo credit: © 2004, HABITAT MEDIA
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Sockeye salmon make their way back to spawn in the rivers where they were born. In British Columbia most salmon farms are sited along the migratory routes of wild salmon, which can expose returning salmon to parasites and disease emanating from the fish farms. For juvenile salmon migrating out to the ocean in the spring, parasites such as sea lice can often be fatal.
Photo credit: © 2003, GREG SYVERSON
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Bluefin tuna, apex predators that migrate from the Mediterranean coast to the Eastern US coast and back again, are becoming more and more rare, in large part due to the growing demand for sushi worldwide. Off the coast of Spain, fishermen catch juvenile wild tuna and sell them to "ranching" operations that grow the fish to market size. Scientists are concerned that these tuna are not being counted against the maximum allowable catch.
Photo credit: © 2004, ATUNES DE MAZARRON
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Off the Andaman coast in Thailand, many fishermen have left their traditional way of life to become workers in the shrimp farm industry. In the past 30 years, 30,000 shrimp farms have sprung up along this coast, many of them combatting disease with antibiotics that health experts fear pose a threat to humans. Nearly 100% of the shrimp raised on these shrimp farms is exported to the US, Europe and Japan.
Photo credit: © 2003, HABITAT MEDIA
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