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A fishery is an area with an associated fish or aquatic population which is harvested for its commercial or recreational value. Fisheries can be wild or farmed. Population dynamics describes the ways in which a given population grows and shrinks over time, as controlled by birth, death, and migration. It is the basis for understanding changing ...
Fish stocks. Fish stocks are subpopulations of a particular species of fish, for which intrinsic parameters (growth, recruitment, mortality and fishing mortality) are traditionally regarded as the significant factors determining the stock's population dynamics, while extrinsic factors (immigration and emigration) are traditionally ignored.
Fisheries science is the academic discipline of managing and understanding fisheries. [1] It is a multidisciplinary science, which draws on the disciplines of limnology, oceanography, freshwater biology, marine biology, meteorology, conservation, ecology, population dynamics, economics, statistics, decision analysis, management, and many others in an attempt to provide an integrated picture of ...
Schaefer worked as a biologist at the Washington State Fisheries Department. From 1937 to 1942 as a scientist for the International Pacific Salmon Fisheries Commission in New Westminster, British Columbia, Canada. In 1946 he joined the United States Fish and Wildlife Service and held various posts at the Fishery Biology Headquarters at Stanford ...
The population dynamics of fisheries has been traditionally used by fisheries scientists to determine sustainable yields. [34] [35] The basic accounting relation for population dynamics is the BIDE model: [36] N 1 = N 0 + B − D + I − E
Fish mortality is a parameter used in fisheries population dynamics to account for the loss of fish in a fish stock through death. The mortality can be divided into two types: Natural mortality: the removal of fish from the stock due to causes not associated with fishing. Such causes can include disease, competition, cannibalism, old age ...
Fish ages are often examined along with measurements of length and weight which combined can provide information on stock composition, age at maturity, life span, mortality, and production. Other purposes of performing age structure analysis are growth analysis, population dynamics estimates and resource management.
Another key paper in fish population dynamics was On the question of the dynamics of the fishing industry from 1925, [8] also translated to English many times. [3] Baranov wrote in Russian, which delayed the spread of his ideas outside the Soviet Union. However, by the end of the 1930s, his work was known in the west.