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In zoology, deep-sea gigantism or abyssal gigantism is the tendency for species of deep-sea dwelling animals to be larger than their shallower-water relatives across a large taxonomic range. Proposed explanations for this type of gigantism include necessary adaptation to colder temperature, food scarcity, reduced predation pressure and ...
The tautog (Tautoga onitis), also known as the blackfish, is a species of wrasse native to the western Atlantic Ocean from Nova Scotia to South Carolina.This species inhabits hard substrate habitats in inshore waters at depths from 1 to 75 m (5 to 245 ft).
They then sold the catch illegally to a fish market in San Pedro. Fish and Game wardens discovered that the fish had been speared by observing the holes and slip tips left behind in their bodies. [13] By the late 1970s, biologists with the California Department of Fish and Game, recognized that the local population of giant sea bass had declined.
The pelagic zone consists of the water column of the open ocean and can be further divided into regions by depth. The word pelagic is derived from Ancient Greek πέλαγος (pélagos) ' open sea '. [1] The pelagic zone can be thought of as an imaginary cylinder or water column between the surface of the sea and the bottom.
Zooplankton and salps play a large role in the active transport of fecal pellets. 15–50% of zooplankton biomass is estimated to migrate, accounting for the transport of 5–45% of particulate organic nitrogen to depth. [40] Salps are large gelatinous plankton that can vertically migrate 800 meters and eat large amounts of food at the surface.
Also called rough fish. See also coarse fish. Trawling – is fishing with a large bag-like net, called a trawl, which is drawn along behind a boat called a trawler. The net can be dragged along the sea bottom in order to target demersal fish, or pulled through clear water in order to target pelagic fish.
Euxinia or euxinic conditions occur when water is both anoxic and sulfidic.This means that there is no oxygen (O 2) and a raised level of free hydrogen sulfide (H 2 S). Euxinic bodies of water are frequently strongly stratified; have an oxic, highly productive, thin surface layer; and have anoxic, sulfidic bottom water.
Demersal fish are fish whose habitats are on or near (typically less than five meters from) the seafloor. Most fish species fit into that classification, because the seafloor contains most of the abyssal zone's nutrients; therefore, the most complex food web or greatest biomass would be in this region of the zone.