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There are three pairs of muscles each on the dorsal and ventral side of the pelvic fin girdle that abduct and adduct the fin from the body. [citation needed] Pelvic fin structures can be extremely specialized in actinopterygians. Gobiids and lumpsuckers modify their pelvic fins into a sucker disk that allow them to adhere to the substrate or ...
The Asian arowana (Scleropages formosus) comprises several phenotypic varieties of freshwater fish distributed geographically across Southeast Asia. [3] While most consider the different varieties to belong to a single species, [4] [5] [6] [3] [7] work by Pouyaud et al. (2003) [8] differentiates these varieties into multiple species.
White fish (Atlantic cod) White fish fillet (halibut – on top) contrasted with an oily fish fillet (salmon – at bottom)Whitefish or white fish is a fisheries term for several species of demersal fish with fins, particularly Atlantic cod (Gadus morhua), whiting (Merluccius bilinearis), haddock (Melanogrammus aeglefinus), hake (Urophycis), and pollock (Pollachius), among others.
The anal fin has 3 spines and 11 or 12 soft rays and has a base which is roughly equal in length to that of the second dorsal fin. The pectoral fin has 16 to 18 unbranched rays and has a mean length of one fifth of the standard length and its tip does not extend to the tip of the pelvic fin. This species has 5 pectoral filaments, the first is ...
The hardhead has an elongated, slender body which is brown to dusky bronze above, the larger fish being darkest, with silver sides. The dorsal fin has its origin behind that of the pelvic fin, It has 69–81 scales on its lateral line; the dorsal fin has 8 rays. The jaws are not extendable and there is a premaxillary frenum.
The pelvic fin has 4–9 rays, and the stomiiformes possess 5–24 branchiostegal rays. Their scales are cycloid , delicate and easily sloughed off; some are scaleless. The coloration is typically dark brown or black; a few (mostly Gonostomatoidei ) are silver, and photophores (light-producing organs) are common in this order.
When it comes to research, understanding the effects supplements have on human health is difficult, time-consuming and costly, said Dr. David Seres, director of medical nutrition at the Columbia ...
The adipose fin is a soft, fleshy fin found on the back behind the dorsal fin and just forward of the caudal fin. It is absent in many fish families, but found in nine of the 31 euteleostean orders ( Percopsiformes , Myctophiformes , Aulopiformes , Stomiiformes , Salmoniformes , Osmeriformes , Characiformes , Siluriformes and Argentiniformes ...