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While most vertebrates usually have one Rh1 opsin gene, some deep-sea fish have several Rh1 genes, and one species, the silver spinyfin (Diretmus argenteus), has 38. [20] This proliferation of Rh1 genes may help deep-sea fish to see in the depths of the ocean. Also, to avoid predation, many species are dark to blend in with their environment. [21]
The small juveniles are yellow with wide, dark irregular bars and irregular dark spots on their fins. [4] The giant grouper can grow to huge size with the maximum recorded standard length being 270 centimetres (110 in), although they are more common around 180 centimetres (71 in), and a maximum published weight of 400 kilograms (880 lb).
Epinephelus marginatus (Latin pronunciation: [epiːˈnepʰelus marɡiˈnaːtus]), the dusky grouper, yellowbelly rock cod or yellowbelly grouper, is a species of marine ray-finned fish, a grouper from the subfamily Epinephelinae which is part of the family Serranidae, which also includes the anthias and sea basses.
Cusk eels produce sounds to mate. Male cusk eels have two pairs of sonic muscles, while female cusk eels have three. [8] Abyssal grenadier: this resident of the abyssal zone is known to live at depths ranging from 800 and 4,000 meters. It has extremely large eyes, but a small mouth.
They have a long, slender body, with a silvery belly and a darker top side with black spots. The fish's fins and tail are long and thin, with a scaleless body. The Pacific sandfish is found over muddy and sandy bottoms to depths of 1,230 feet (370 m). Females lay a clutch of about 1000 eggs during the spawning months in winter.
At the depths at which these fishes live it is dark and food is sparse and rarely encountered. The female footballfish have bioluminescent bacteria in their escas and this is used to attract prey to within striking distance of the mouth. The prey is whatever they can fit into their mouths, and the backward curving teeth ensure that prey are ...
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The black seadevil family, Melanocetidae, was first proposed as a subfamily in 1878 by the American biologist Theodore Gill. [2] The only genus in the family is Melanocetus which was proposed as a monospecific genus in 1864 by the German-born British herpetologist and ichthyologist Albert Günther when he described the humpback anglerfish (M. johnsoni). [3]