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Ophidiiform fish typically have slender bodies with small heads, and either smooth scales, or none at all. They have long dorsal fins, and an anal fin that is typically united with the caudal fin. The group includes pelagic, benthic, and even parasitic species, although all have a similar body form.
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.
Meristics is an area of zoology and botany which relates to counting quantitative features of animals and plants, such as the number of fins or scales in fish.A meristic (countable trait) can be used to describe a particular species, or used to identify an unknown species.
Scales to be domed; Dorsal fin to be single, all other fins to be paired; Caudal fin to be divided and forked and held above the horizontal; Extremities of fins to have a slightly rounded appearance; Minimum length of body to be 5.5 cm (2¼ inches) The fish should be bright and alert and displaying well developed domed scales all over the body ...
The ventral fins are about halfway between the anal fin and the tip of the snout, while the pectoral fins are considerably longer than the body is deep and are situated very low down on the sides. No scales are present, and the fins are very fragile. Lancetfishes are among the largest living bathypelagic fish forms.
The knifefish has approximately one hundred and fifty fin rays along its ribbon-fin. These individual fin rays can be curved nearly twice the maximum recorded curvature for ray-finned fish fin rays during locomotion. These fin rays are curved into the direction of motion, indicating that the knifefish has active control of the fin ray curvature ...
The filaments tend to be longer in adults than they are in young fish. The caudal fin is deeply forked with its upper and lower caudal-fin lobes not bearing filaments. There are 56 to 64 pored scales in the lateral line which is forked on the caudal fin, with branches reaching onto the rear margin of the lobes of the tail. [3]
The finescale dace (Chrosomus neogaeus) is a species of freshwater fish in the family Cyprinidae of order Cypriniformes.It is native to the northern portions of Minnesota, [3] with relatively smaller populations in northern New York, Vermont, New Hampshire (where C. neogaeus is found in only Connecticut and Androscoggin River drainages north of the White Mountains), and Maine.