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Elasmobranchii is one of the two subclasses of cartilaginous fish in the class Chondrichthyes, the other being Holocephali . Members of the elasmobranchii subclass have no swim bladders, five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins, and small placoid scales. The teeth are in several series; the ...
At present, it is known to exist only in the eastern Arabian Sea, parts of South Asia and Australia and Papua New Guinea. [2] The narrow sawfish is bentho-pelagic and is found at depths of about 100 meters (330 feet). The narrow sawfish prefers soft bottom-substrates, such as sand, mud, or seagrass, to rocky or coraline habitats.
However, it was added in 2011, [126] and all the remaining sawfish species were added in 2014, restricting trade in them and their parts in the United States. [41] In 2020, a Florida fisherman used a power saw to remove a smalltooth sawfish's rostrum and then released the maimed fish; he received a fine, community service and probation. [127]
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These three types show very similar oxygenation and carbonylation properties, which are unaffected by urea, an important compound in marine elasmobranchii physiology. They display identical electronic absorption and resonance in Raman spectroscopy, indicating that their heme-pocket structures are identical or highly similar. The hemoglobins ...
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