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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 ...
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.
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 .
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 ...
Unless there is strong selective pressure, outbreeding depression can increase in further generations as coadapted gene complexes are broken apart without the forging of new coadapted gene complexes to take their place. If the outcrossing is limited and populations are large enough, selective pressure acting on each generation can restore fitness.
Yearlings of A. gueldenstaedtii (a) and P. spathula (d), and their hybrids: (b) typical LH (larger genome) hybrid, (c) typical SH (smaller genome) hybrid. [1]The sturddlefish is a hybrid of the American paddlefish (Polyodon spathula) and the Russian sturgeon (Acipenser gueldenstaedtii), accidentally created by researchers in 2019 and announced in 2020. [2]
In the earlier version of "Rumpelstiltskin," The Miller's Daughter has a perplexing, but empowering problem, she can only spin straw into gold, and is unable to complete her needed domestic duties. In the now popular 1812 version of "Rumpelstiltskin," The Miller's daughter is forced to spin straw into gold by a greedy king, but continually ...
See text The filefish ( Monacanthidae ) are a diverse family of tropical to subtropical tetraodontiform marine fish , which are also known as foolfish , leatherjackets or shingles . They live in the Atlantic , Pacific and Indian Oceans .