Fisheries

The variety of freshwater fishes is striking, for they show radiations into different habitats with some of the most extraordinary adaptations of all fishes. The African mormyrids and the South American gymnotids, for example, have independently evolved amazingly specialized electrical signaling systems for use in crowded and turbid waters, and …

Diversity of Freshwater Fishes Despite representing only a miniscule (0.0093% according to Horn, 1972) part of the world’s aquatic habitat, freshwaters contain a disproportionate number of species (over 40%, again according to Horn, 1972). Unlike the oceans, which constitute broad, uninterrupted expanses of water, freshwater habitats tend to be much …

Epipelagic Fishes The open ocean beyond the continental shelf covers nearly two-thirds of the surface of the Earth, and some 2500 species are found there, distributed vertically from the uppermost waters to the greatest depths, about half being benthic, half pelagic. Near the surface is the euphotic zone, where light …

The living Latimeria chalumnae was first identified off Southern Africa in 1938, and was known from some 200 further specimens all caught off the volcanic islands of the Comoro archipelago near Madagascar until a large female was trawled off Mozambique in August 1991. Further search produced more off Sulewesi  which …

Holostei Even fewer holosteans than chondrosteans survive today. The bowfin (Amia) of rivers in eastern North America, and seven species of garpikes (Lepisosteus and Atractosteus) from fresh and brackish waters of North and Central America, are all that remain. Garpikes are more primitive than Amia, and, as form the sister group …

Warm-water Fishes By far the greatest number (80%) of the 10 000 or so species of fishes in shallow seas live in warm temperate or tropical waters, most associated with coral reefs and atolls, in waters where mean temperatures during the coldest part of the year do not fall below …

Introduction Fishes live in virtually every watery habitat found on earth. The world’s deepest living fish (Abyssobrotula galatheae) was found in the Puerto Rican Trench at a depth of 8372 meters while the Tibetan stoneloach (Triplophysa stoliczkai) lives at altitudes over 5200 meters in the Himalaya. The habitats of fishes …

The surviving 25 species of chondrostean fishes are divided between the bichirs and reedfishes (18 extant species of the genera Polypterus and Erpetoichthys) in the Brachiopterygii, and the acipenseriform sturgeons and paddlefishes (Acipenser, Polyodon, and Psephurus). Both groups share primitive characters such as spiracles and a spiral valve, but Polypterus …

Six species of lungfish in three genera survive today  from a group that appeared in the Devonian and was widespread in the Paleozoic. Modern lungfish are in several ways at once specialized and simplified versions of their more completely ossified ancestors. The Australian (Queensland) Neoceratodus is the most heavily ossified …

Lampreys share with gnathostomes a more advanced kidney than hagfish, a pho-tosensitive pineal, a lateral line, radial muscles in the fins, functional eyes, extrin-sic eye muscles, neural and hemal vertebral elements formed around the notochord, and similarities in pituitary histology. These features have strongly suggested to some that hagfish is …