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Some fish, like salmon, spend almost their whole life muaturin in the ocean, then swim many miles up their ancestral rivers, to lay their eggs, commonly dying after spawning. though most commonly associated with fish, spawning triggers also occur in bivalves [1] [2] and corals.
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 ...
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 .
The terms shell dwellers or shelldwellers, shell-breeding, or ostracophil are descriptive terms for cichlid fish that use the empty shells of aquatic snails as sites for breeding and shelter. The terms have no taxonomic basis, although most shell-dwelling cichlids are from Lake Tanganyikas lamprologine lineage. [ 1 ]
Cavefish are quite small with most species being between 2 and 13 cm (0.8–5.1 in) in standard length and about a dozen species reaching 20–23 cm (8–9 in). Only three species grow larger; two slender Ophisternon swamp eels at up to 32–36 cm (13–14 in) in standard length and a much more robust undescribed species of mahseer at 43 cm (17 ...
Splake exhibit higher growth rates than either parent species and can attain 46 cm (18 in) in length only two years after being planted as fingerlings (i.e., at 2½ years of age). By way of contrast, lacustrine brook trout would approach 25 cm (10 in) in length at a similar age and similarly aged lake trout would be expected to be less than 40 ...
The young can grow about 50 mm (2.0 in) per month under optimal conditions. The Australian lungfish has very complex courtship behaviour made up of three distinct phases. The first is the searching phase, when the fish will range over a large area, possibly searching for potential spawning sites. [32]
Fisheries-induced evolution differs from the Darwinian evolution model by virtue of the direct human factor. [2] For FIE, fishing enforces a greater selection pressure for traits, often through sheer effort and catch numbers, which can disparage natural selection pressures such as predator-prey interactions and environmental influences.