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Most have only one dorsal fin, but some have two or three. Wildlife biologists often use the distinctive nicks and wear patterns which develop on the dorsal fins of whales to identify individuals in the field. The bones or cartilages that support the dorsal fin in fish are called pterygiophores.
A fish can have up to three dorsal fins. The dorsal fins serve to protect the fish against rolling, and assist it in sudden turns and stops. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure; The bones that support the dorsal fin are called pterygiophores.
It has two dorsal fins, the first of which has a tiny spine at the front with the second and third spines being much longer. The anal fin lies directly below the posterior dorsal fin. The colour of the fins is pinkish-orange and larger fish have a line of brown spots on the membranes of second dorsal fin and the anal fin.
The family consists of 51 species in 15 genera and two subfamilies. All species are in the subfamily Scombrinae, except the butterfly kingfish, which is the sole member of subfamily Gasterochismatinae. [1] Scombrids have two dorsal fins and a series of finlets behind the rear dorsal fin and anal fin.
Growing to 60 cm (24 in) long, this species has a nearly circular pectoral fin disc and a short, thick tail with two dorsal fins of nearly equal size and a large caudal fin. It can be identified by the prominent blue spots on its back, which usually number five but may vary from zero to nine, as well as by the small knobs on the rims of its ...
Polynemus multifilis is a medium-sized species of threadfin which attains a maximum standard length of 28 centimetres (11 in). [2] It has a pointed snout and the dorsal profile of the head is almost straight, There are two separate dorsal fins, the first dorsal fin contains 8 spines which are all of a similar thickness at their bases and the second dorsal fin has a single spine and 14-16 soft ...
There are two separate dorsal fins, the first dorsal fin with 8 spines in which the bases of the spines have a similar thickness and the second dorsal fin has a single spine and 15 to 19 soft rays. The anal fin has 3 spines and 11 to 13 soft rays and it has a base that is shorter than the base of the second dorsal-fin base.
It has two separate dorsal fins: the anterior portion consisting of 6-7 dorsal spines and the posterior portion consisting of 14-15 soft dorsal rays. Its anal fin contains 2 spines and 9-11 soft rays. Its most prominent features are the two bean shaped torch-like organs under its eyes containing symbiotic bioluminescent bacteria Candidatus ...