Fish species can be found in nearly all large bodies of water, including salt, brackish and fresh water, at depths from just below the surface to a few thousand meters. However, super-salty lakes such as the Great Salt Lake or the Dead Sea do not support fish survival. Several species of fish have been bred specifically for keeping in aquariums and can live in indoor environments.
Fishing for purposes such as food or entertainment or sport is collectively referred to as fishing (fishing). The annual output from all of the aforementioned sectors on a worldwide scale is about 100 million tons. Overfishing is a threat to many fish species. On May 15, 2003, Nature magazine announced that all large fish species in the oceans were systematically overfished and that no more than 10% of the 1950s remained. . Among the most affected are sharks, Atlantic cod, bluefin tuna, and Pacific sardines. The authors also propose an immediate drastic reduction in fishing and conservation of the marine environment worldwide.