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Sea cages can attract a variety of wild predators which can sometimes become entangled in associated netting, leading to injury or death. In Tasmania, Australian salmon-farming sea cages have entangled white-bellied sea eagles. This has prompted one company, Huon Aquaculture, to sponsor a bird rehabilitation centre and try more robust netting. [85]
Farmed salmon, however, are trapped in cages and cannot make the journey toward colder water. Last year, when a record 17.4 million farmed salmon died in Scotland, processors blamed warming water ...
While the ranching systems currently used for tuna use open net cages at the surface of the sea (as is done also in salmon farming), the offshore technology usually uses submersible cages. [2] These large rigid cages – each one able to hold many thousands of fish – are anchored on the sea floor, but can move up and down the water column. [13]
For example, as stated above, some of the most important fish species in the industry, salmon, can be grown using a cage system. This is done by having netted cages, preferably in open water that has a strong flow, and feeding the salmon a special food mixture that aids their growth.
Not so long ago, Atlantic salmon was an abundant wild species. Born in the rivers of northeastern United States and Canada, after a couple years in freshwater they embarked on an epic migration ...
The transfer of parasites from open-net cage salmon farming, especially sea lice, has reduced numbers of wild salmon. The European Commission (2002) concluded, "The reduction of wild salmonid abundance is also linked to other factors but there is more and more scientific evidence establishing a direct link between the number of lice-infested wild fish and the presence of cages in the same ...
In 2022, Time called farmed Atlantic salmon “the most popular fish on dinner tables in North America,” but cautioned that they’re raised in overcrowded cages that are “rife with parasites ...
Farmed Atlantic salmon are known to occasionally escape from cages and enter the habitat of wild populations. Interbreeding between escaped farm fish and wild fish decreases genetic diversity and introduces "the potential to genetically alter native populations, reduce local adaptation and negatively affect population viability and character ...