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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 ...
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.
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.
Capture includes fish, crustaceans, molluscs, etc. [1] [2] [3] World capture fisheries and aquaculture production, from FAO's Statistical Yearbook 2021 [ 4 ] ↑ By species group
The fisheries sector accounts for 3% of Morocco's GDP. The government estimates the number of direct and indirect jobs at 400,000 (including 104,000 fishermen). [4] The small-scale fisheries sector (100,000 people) lags far behind other branches of the fishing industry owing to the lack of infrastructure and of harbour facilities and plant.
Due to the limited availability of fish seed, carp has fallen out of favour, and North African catfish, along with Nile tilapia, has taken its place. Although fish farming in Uganda has so far been pond- and subsistence-based, the growing interest in commercial aquaculture is providing an impetus towards cage-culture based aquaculture.
Aquaculture has an average annual growth rate of 9.2%, however, the success and continued expansion of the fish farming sector is highly dependent on the control of fish pathogens including a wide range of viruses, bacteria, fungi, and parasites.
Because of their high protein content, large size, rapid growth (6 to 7 months to grow to harvest size), [3] and palatability, a number of coptodonine and oreochromine cichlids—specifically, various species of Coptodon, Oreochromis, and Sarotherodon—are the focus of major aquaculture efforts. Tilapia fisheries originated in Africa and the ...