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It is one of the largest digenean families, with 25 genera containing hundreds of described species. [2] Bucephalids are cosmopolitan , having been recorded all over the world. They are parasites of fish from freshwater , marine , and brackish water habitat types.
The genus Anisakis was defined in 1845 [2] by Félix Dujardin as a subgenus of the genus Ascaris Linnaeus, 1758.Dujardin did not make explicit the etymology, but stated that the subgenus included the species in which the males have unequal spicules ("mâles ayant des spicules inégaux"); thus, the name Anisakis is based on anis-(Greek prefix for different) and akis (Greek for spine or spicule).
The Oregon giant earthworm was first described by Frank Smith in 1937 from a specimen found near Salem, Oregon in 1903. The species was named in honor of its collector, F. M. McElfresh. [ 2 ] Like its cousin, the giant Palouse earthworm ( Driloleirus americanus ) of Washington, this species can grow to lengths in excess of 3 feet (0.91 m) and ...
Parasites in fish are a common natural occurrence. Parasites can provide information about host population ecology. In fisheries biology, for example, parasite communities can be used to distinguish distinct populations of the same fish species co-inhabiting a region. [9]
The species is found in the northern and western Atlantic Ocean along the shores of Europe and North America, in the western Mediterranean Sea, the Black Sea, and as an invasive species in the Great Lakes. [1] They have been found at depths up to 4000 meters and can tolerate temperatures of 1–20 °C (34–68 °F). [4]
A few studies indicated no long-term damage to fish stocks in some locations, [37] and a population decline in wild salmon that occurred in 2002 was caused by "something other than sea lice". [38] However, the repeated epizootics of lice on wild fish have only occurred in areas with salmon farms in Ireland, Britain (Scotland), Norway, Canada ...
Traces of Cryptosporidium were found in the lake during a routine test by the Baltimore City Department of Public Works crew members. A microscopic parasite was detected in the Druid Lake ...
A large alligator gar, the largest freshwater fish in North America The largest of the gar, and the largest entirely freshwater fish in North America, is the alligator gar (Atractosteus spatula). The largest gar ever known, caught in Louisiana in 1925, was 3 m (9.8 ft) in length and weighed 137 kg (302 lb). [1] Anglerfish (Lophiiformes)