Intensive and over fishing
fish farming
intensive fish farming is a way of production meant to increase the quantity of fish produced per unit of rearing area.
in order to intensify the culture, production factors, such as the quality of water, the feed and the marine animals living conditions are controlled and improved: fishers have to take care of the feed provided and they must replenish water at a high rate to maintain oxygen levels and remove waste.
different types
fish farming is described as being extensive, semi-intensive or intensive.
that's related to the quantity of feedgiven to the fish or to their stocking density.
in the most extensive fish farming, ponds, which can be natural or artificial, and lagoons are fertilised to promote the presence of aquatic vegetation which form the base of the aquatic food pyramid.
this encourages the development of marketable animals at a higher profit than that of the natural ecosystem.
farming methods
for example, one of the most common methods of farming in China is to grow fish, such as the bighead carp, in small lakes and reservoirs without the use of fertilizer.
intensive fish farming issues
the intensive farming of fish, for-which large numbers of them are confined in a small area, causes a range of serious health and safety problems: intensive fishing is one factor that contributes to algae overgrowth because it reduces the number of organisms that feed on algas.
large-scale fishing operations often unintentionally kill marine life, including juvenile fish, corals, sharks, whales, and even birds.
another important fishing problem that affects marine lives...
overfishing
another important fishing problem is the overfishing: the capture of too many fish, which is faster than stocks can replenish, creating an imbalance that can ruin the food web.
this leads to a loss of marine life, including species like sea turtles and cetaceans.
its dangers
harmful effects of overfishing are the commercial extinction, which is the reduction of numbers of species, especially the marine ones, until fishers cannot catch enough fish to earn profit.
this precedes the total extinction of the species, which no longer exist.
for these reasons, fisheries should behave responsibly because they are major forces of ecological and evolutionary change.
studies and facts
scientists estimate that the number of fish in the ocean is 3.500.000.000.000 (2017), which is continously changing due to factors such as predation, fishing, reproduction and environmental state.