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A pregnant Southern platyfish. Pregnancy has been traditionally defined as the period of time eggs are incubated in the body after the egg-sperm union. [1] Although the term often refers to placental mammals, it has also been used in the titles of many international, peer-reviewed, scientific articles on fish.
Fish with low inbreeding showed almost twice the aggressive pursuit in defending territory than fish with medium inbreeding, and furthermore had a higher specific growth rate. A significant effect of inbreeding depression on juvenile survival was also found, but only in high-density competitive environments, suggesting that intra-specific ...
Various studies have shown that the life expectancy of fish that survive into adulthood is in the range of 25 to 35 years. [9] The back of the fish is iridescent and blue-green in color, with many yellow and gold spots. [6] [10] The belly is white. The head color changes from a light blue to a pinkish mix during spawning season.
Depending upon environmental conditions, sailfin mollies may become reproductive in less than a year. Sailfin mollies are small fish. At one year of age, males typically range in size from 0.5 to 3 in (13 to 76 mm) SL, while mature females are likely to be 0.5 to 2.5 in (13 to 64 mm) inch SL. The size of adult males is directly correlated with ...
The drum typically weighs 5–15 lb (2.3–6.8 kg). The world record was caught on Nickajack Lake in Tennessee, and weighed in at 54 lb 8 oz (24.7 kg). [12] The freshwater drum is frequently gray or silvery but may be more bronze or brown colored, common in the Lake Erie population.
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Small individual. Tautog are brown and dark olive, with white blotches, and have plump, elongated bodies. They have a typical weight of 0.5 to 1.5 kg (1 to 3 lb) and reach a maximum length and weight of 90 cm (3 ft) and 13.1 kg (28 lb 14 oz), respectively.
Fish species (IUCN, 2016-2) 15,219 extant species have been evaluated; 12,028 of those are fully assessed [a] 9679 are not threatened at present [b] 2343 to 5534 are threatened [c] 71 to 158 are extinct or extinct in the wild: 65 extinct (EX) species [d] 6 extinct in the wild (EW) 87 possibly extinct [CR(PE)] 0 possibly extinct in the wild [CR ...