Crested Bigscale

Crested Bigscale, Poromitra crassiceps

The Crested Bigscale, Poromitra crassiceps, whose Spanish common name is aletudo crestada, is a species in the family Melamphaidae, the Bigscale and Ridgeheads, known as aletudosin Mexico. Globally, there are thirty seven species in the family placed in five genera. There are twenty two global member members of the Poromitra Genus with three being found in Mexican waters, all in the Pacific.

The Crested Bigscale has an elongated rectangular body with a serrated crest on top of the head. They are black in color with dark fins. They have three dorsal spines and 11 to 14 soft rays, one anal spine and 8 to 11 soft rays; the caudal fin is shallow and forked and the pectoral fins are long and slender being longer than the head. The Crested Bigscales are oviparous with planktonic eggs and larvae with life spans of 9 years. Adults feed on small crustaceans. The Crested Bigscale reach a maximum length of 19 cm (7.5 inches). They are a mesopelagic and bathypelagic species found at depths between 450 and 13,120 feet vertically migrating during the night toward the surface for feeding. Juveniles are found in shallower water than the adults. They are found in all Mexican waters of the Pacific.

The Crested Bigscale is too rare and too small to be of interest to most.

Crested Bigscale, Poromitra crassiceps: Fish collected and identified by H.J. Walker, Jr., Scripps Institute of Oceanography, La Jolla, CA, in a deep water trawl net off Point Loma, CA, August 2010. Length: 8.1 cm (3.2 inches).
Crested Bigscale, Poromitra crassiceps: Fish collected and identified by H.J. Walker, Jr., Scripps Institute of Oceanography, La Jolla, CA, in a deep water trawl net off Point Loma, CA, August 2010. Length: 8.1 cm (3.2 inches).