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For example, the fishing effort exerted by a fishing fleet in a trawl fishery might be measured by summing the products of the engine power for each boat and time it spent at sea (KW × days). For a gill-net fishery the effort might be measured by summing the products of the length of each set net and the time it was set in the water (Km × ...
Fishing mortality: the removal of fish from the stock due to fishing activities using any fishing gear. [1] It is denoted by (F) in fisheries models. (M) and (F) are additive instantaneous rates that sum up to (Z), the instantaneous total mortality coefficient; that is, Z=M+F. [2] These rates are usually calculated on an annual basis.
Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” [4] However, it was not until the development of the microscope that more detailed studies were performed on the structure of scales. [5]
These include details on the age structure of the stock, age at first spawning, fecundity, ratio of males to females in the stock, natural mortality (M), fishing mortality (F), growth rate of the fish, spawning behavior, critical habitats, migratory habits, food preferences, and an estimate of either the total population or total biomass of the ...
In fisheries and conservation biology, the catch per unit effort (CPUE) is an indirect measure of the abundance of a target species. Changes in the catch per unit effort are inferred to signify changes to the target species' true abundance.
A higher ratio suggests to investors that an investment in the company is relatively low risk. ... Continue reading → The post What a High Times Interest Earned Ratio Tells Investors appeared ...
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Condition index in fish can be used to make management decisions such as fishing limits in specific areas. For example, Ratz and Lloret (2002) observed that Atlantic cod living in colder waters, such as Greenland, Labrador and Grand Bank, were in poorer condition than cod living in warmer waters such as the North Sea and Irish Sea.