Plainfin grenadier
Encyclopedia
The plainfin grenadier (Ventrifossa divergens) is a species of rattail
Rattail
Grenadiers or rattails are generally large, brown to black gadiform marine fish of the family Macrouridae...

. This is a deep-water fish found at depths of up to 772 m. It has a wide distribution in the Indian
Indian Ocean
The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

 and western Pacific Oceans.

This species reaches a length of 30 cm. As suggested by the common name, it has a uniformly dark first dorsal fin
Dorsal fin
A dorsal fin is a fin located on the backs of various unrelated marine and freshwater vertebrates, including most fishes, marine mammals , and the ichthyosaurs...

, lacking the contrasting blotch seen in many species in the genus. It also has a black margin to its snout.
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