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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 ...
Dorsal fins: Located on the back of the fish, dorsal fins serve to prevent the fish from rolling and assist in sudden turns and stops. Most fishes have one dorsal fin, but some fishes have two or three. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure.
All fins are rounded with slightly incised membranes; the pectoral fins are small. The single dorsal fin is positioned far back from the head, larger than and above the retrorse anal fin. Females have large, highly distensible stomachs which give the ventral region a flabby appearance. In life, black seadevils are a dark brown to black.
The dorsal fin has 10 spines and 14 soft rays, with a slight incision after the spines, while the anal fin has 3 spines and 8 soft rays. [2] The maximum total length recorded for this species is 75 cm (30 in) although 50 cm (20 in) is more typical, and the maximum published weight is 14.0 kg (30.9 lb). [ 2 ]
The anal fin is about the same size as the dorsal fin. [7] The white crappie has six dorsal fin spines, whereas the black crappie has seven or eight dorsal fin spines. [7] White crappies are also slightly more elongated than black crappies. [8] The white crappie is a deep-bodied fish with a flattened body, or a depth that is one-third of the ...
The dorsal fin has five spines and 37 to 41 soft rays, the anal fin has three spines and 20 to 24 soft rays. The bases of these fins have a fleshy sheath clad with scales that partially conceals the rays. The head is grey and the body colour violet-black, dark brown or purplish, with a paler belly. The fins are darker than the body colour.
Pterygoplichthys can be differentiated from most other loricariids due to their large dorsal fins with 9 or more (usually 10) dorsal fin rays, which gives them their common name "sailfin catfish". [7] These fish have rows of armour plating covering the body; the abdomen is almost completely covered in small plates. [5]