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The Gordon-Schaefer model is a bioeconomic model applied in the fishing industry.It may be used to compute the maximum sustainable yield.It takes account of biological growth rates, carrying capacity, and total and marginal costs and revenues.
Abalone accounted for the biggest increase with production increasing by 61% from 515 tons in 2003, to 833 tons in 2006. Declines in production were experienced by the following sub-sectors: oyster, mussel, and trout with reductions in production of 19.2%, 39.5%, and 18.4% respectively.
Fish farming or pisciculture involves commercial breeding of fish, most often for food, in fish tanks or artificial enclosures such as fish ponds. It is a particular type of aquaculture , which is the controlled cultivation and harvesting of aquatic animals such as fish, crustaceans , molluscs and so on, in natural or pseudo-natural environments.
The individual growth model, published by von Bertalanffy in 1934, can be used to model the rate at which fish grow. It exists in a number of versions, but in its simplest form it is expressed as a differential equation of length ( L ) over time ( t ): L ′ ( t ) = r B ( L ∞ − L ( t ) ) {\displaystyle L'(t)=r_{B}\left(L_{\infty }-L(t ...
With 5.8 percent annual growth rate during the period 2001–2016, aquaculture continues to grow faster than other major food production sectors, but it no longer has the high annual growth rates experienced in the 1980s and 1990s. [24]
While annual growth of aquaculture has declined in recent years, significant double-digit growth is still recorded in some countries, particularly in Africa and Asia. [18] FAO predicted in 2018 the following major trends for the period up to 2030: [18] World fish production, consumption and trade are expected to increase, but with a growth rate ...
The introduction of new fish species also boosted fish production. Fish production increased by six times in 30 years rising from 60,000 tons in 1961 to 245,000 tons in 1990 partly as a result of higher productivity of the lakes but also because of the increased catch effort.
According to a 2019 FAO report, global production of fish, crustaceans, molluscs and other aquatic animals has continued to grow and reached 172.6 million tonnes in 2017, with an increase of 4.1 percent compared with 2016. [23] There is a growing gap between the supply of fish and demand, due in part to world population growth. [24]