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The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species. For example, the white marlin has a dorsal fin with a curved front edge and is covered with black spots. [4] The huge dorsal fin, or sail, of the sailfish is kept retracted most of the time. Sailfish ...
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 ...
The first dorsal fin is black; the second dorsal fin is greyish with the last ray being white. The base of the pectoral fin is greyish black, darkening to black towards the rear. The pectoral filaments are greyish-black with white tips and bases. The front part of the pelvic fin is greyish black with the rest of it being coloured white.
The anal fin has 10 rays. The spotfin killifish's dorsal fin originates posteriorly to the anal fin origin; this is another useful character that differs from other fundulids, including F. heteroclitus. [18] While adults are distinct, larval fundulids can be tricky to ID to species. Longitudinal scale rows number 34–36. [3]
Behind the large primary dorsal fin is the secondary dorsal fin, which is made up of five to six rays. [10] White marlin have a set of similar pectoral fins and pelvic fins. These two sets of fin are rounded and wide at the tip. They also have two anal fins which can be used for identification between species. The lateral line on this species ...
Its dorsal fin is triangular and very high, and it has very long pectoral fins. Sandbar sharks usually have heavy-set bodies and rounded snouts that are shorter than the average shark's snout. Its upper teeth have broadly uneven cusps with sharp edges. Its second dorsal fin and anal fin are close to the same height.
According to biologists, the dorsal fin’s size in such shallow water should reveal part of the shark’s back or a second dorsal fin — neither of which are visible.
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 ...