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Among the many labels are wild-caught and farm-raised.It’s tempting to opt for farmed-raised, as often the wild-caught fish cost twice as much!One example of this was the Pacific oyster in the UK, which was introduced into its waters in the 1960s via aquaculture with the idea that it would be a more commercially viable species than the native oyster.Unfortunately, these pacific oysters have spread and created reef formations, forcing out the native oysters and altering the marine environment.
Unfortunately, when something seems to good to be true, it very often is!Since farmed fish often have been bred via selective breeding they have a lower genetic variation than wild fish.If they interbreed with the wild fish it can result in a less genetically diverse, and therefore less robust, population. For example, Atlantic and Pacific salmon belong to different genera and while they can produce offspring, those offspring will be unable to reproduce (like mules).This density of fish creates problems like disease and pollution.The biggest source of pollution is the accumulation of fish waste and uneaten food beneath the sea pens which can degrade the quality of the surrounding water.
Another example of the negative effect of fish farming on native fish population and environment is with Tilapia.