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Histotrophic (tissue eating) viviparity means embryos develop in the female's oviducts but obtain nutrients by consuming other tissues, such as ova or zygotes. [10] This has been observed primarily among sharks such as the shortfin mako and porbeagle , but is known for a few bony fish as well such as the halfbeak Nomorhamphus ebrardtii . [ 12 ]
There is much variation among the European whitefish forms, but in general they have a tapered body, a slightly protruding upper jaw and a fleshy dorsal fin that is typical of the salmon family. The snout is short and tapered, a fact that distinguishes this species from the two other North European Coregonus species, vendace ( Coregonus albula ...
Lake whitefish are found throughout much of Canada and parts of the northern United States, including all of the Great Lakes. The lake whitefish is sometimes referred to as a "humpback" fish due to the small size of the head in relation to the length of the body. [3] [a] It is a valuable commercial fish, and also occasionally taken by sport ...
Fish embryos go through a process called mid-blastula transition which is observed around the tenth cell division in some fish species. Once zygotic gene transcription starts, slow cell division begins and cell movements are observable. [4] During this time three cell populations become distinguished. The first population is the yolk syncytial ...
Coregonus ussuriensis L. S. Berg, 1906 (Amur whitefish) Coregonus vandesius J. Richardson, 1836 (vendace) Coregonus vessicus Dryagin, 1932; Coregonus wartmanni (Bloch, 1784) Coregonus widegreni Malmgren, 1863 (Valaam whitefish) Coregonus zenithicus (D. S. Jordan & Evermann, 1909) (shortjaw cisco) Coregonus zuerichensis Nüsslin, 1882; Coregonus ...
Furthermore, the milk is rich in protein and lipid. As the embryo grows, vascularisation of the trophonemata enlarges to form sinusoids that project out to the surface to form a functional respiratory membrane. In lamnoid sharks, following yolk use, the embryos develop teeth and eat eggs and siblings within the uterus. There is usually one ...
In their ecosystems, whitefish tend to be some of the largest fish and occupy niches as benthic predators. [11] The recent invasion of several invasive species, [12] including the sea lamprey and zebra mussels, [11] has begun to pose a threat to the whitefish population by disrupting historic ecological relationships and prey distribution. [13]
The Atlantic whitefish (Coregonus huntsmani) is a coregonine fish inhabiting some freshwater lakes within Nova Scotia, Canada. [2] [3] It is known to survive only in the Petite Rivière watershed as landlocked populations. Earlier it was also found in the Tusket and Annis rivers of Nova Scotia.