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While immigration and emigration can be present in wild fisheries, they are usually not measured. A fishery population is affected by three dynamic rate functions: Birth rate or recruitment. Recruitment means reaching a certain size or reproductive stage. With fisheries, recruitment usually refers to the age a fish can be caught and counted in ...
The direct selection for biological traits through fishery practices is the result of fishery management regulations, and gear restrictions and selectivities. [1] The most obvious artificial selection for traits through management legislation can be observed in the imposed regulations on size (minimum landing size), sex, seasonality, and locations.
MVP refers to the smallest possible size at which a biological population can exist without facing extinction from natural disasters or demographic, environmental, or genetic stochasticity. [1] The term " population " is defined as a group of interbreeding individuals in similar geographic area that undergo negligible gene flow with other ...
The word "semelparity" was coined by evolutionary biologist Lamont Cole, [4] and comes from the Latin semel ('once, a single time') and pario ('to beget'). This differs from iteroparity in that iteroparous species are able to have multiple reproductive cycles and therefore can mate more than once in their lifetime.
Fear of fish or ichthyophobia ranges from cultural phenomena such as fear of eating fish, fear of touching raw fish, or fear of dead fish, up to irrational fear (specific phobia). Selachophobia, or galeophobia , is the specific fear of sharks .
This idea is known as the "geomagnetic imprinting hypothesis" [6] The concept was developed in a 2008 paper that sought to explain how sea turtles and salmon can return to their home areas after migrating hundreds or thousands of kilometers away [7] In animal behavior, the term "imprinting" refers to a special type of learning.
In competitions between sperm from an unrelated male and from a full sibling male, a significant bias in paternity towards the unrelated male was observed. [4] It is a theory that females avoid inbreeding more than males due to the fact that when they mate with a sibling, they obtain 50% less sperm in their ovarian cavities in comparison to ...
Depending on her size, the female spawns about 400–1500 eggs per cycle. [6] The expected tenure of breeding females is roughly 12 years and is relatively long for a fish of its size, but is characteristic of other reef fish. [7] Why the nonbreeders continue to associate with these groups has been unclear.