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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.
Like commercial farming operations on land, the density of fish in these pens necessitates certain chemicals to keep animals from getting sick and to keep things clean.
The chemicals used in marine aquaculture operations such as medicines like antibiotics and vaccines, disinfectants, and substances used to prevent corrosion of equipment (cages, etc.) can also change the composition of the surrounding aquatic ecosystem.
Another example of the negative effect of fish farming on native fish population and environment is with Tilapia.
Tilapia is one of the most common types of farmed fish.
Tilapia is a warm-water fish native to Africa, but in the last 60 years the governments of poor tropical countries saw the fish as a solution to control weeds and mosquitoes in lakes and rivers, breeding and releasing tilapia into these areas.
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!
(12, 13)Modern fish farming practices often raise fish near the top of the food chain (affecting populations of fish that eat or are eaten by these species) and contain thousands of fish in tiny pens (similar to commercial chicken or cow operations).
As you may imagine, these conditions leave something to be desired and affect both the quality of the fish and the health of the ocean.