Search results
Results from the WOW.Com Content Network
Dorsal fin of a shark. A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments ...
There is a deep notch in the dorsal fin and the fourth dorsal spine is longer than the others while the second anal spine is also very large. [4] The black margate reaches a maximum total length of 76 cm (30 in), although a total length of 45 cm (18 in) is more typical, while the heaviest specimen recorded was 5.8 kg (13 lb).
The dorsal and anal fins are quite low, and the dorsal fin is much longer than the anal. The pectoral fin is small for a carangid, about the length of the pelvic fin and is not falcate, with 20 rays. The pelvic fin consists of one spine and five branched soft rays. The caudal fin is also highly diagnostic, being deeply forked and consisting of ...
The caudal fin is strongly divided and rigid, with a slender, ridged base. The first (spiny) dorsal fin and the pelvic fins are normally retracted into body grooves. Species lengths vary from the 20 cm (7.9 in) of the island mackerel to the 4.58 m (15.0 ft) recorded for the immense Atlantic bluefin tuna .
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 colour is bright red on the upper body, pale on the lower body with pink pelvic fins. The anal fin is white at its base while the pectoral and dorsal fins are yellowish. [ 8 ] This fish has a maximum published total length of 70 cm (28 in), although a fork length of 27.6 cm (10.9 in) in males and 20.4 cm (8.0 in) in females is more typical.
The tail is dark brown or black, the dorsal fin is a greyish-green in colour and all the other fins are orange-red. [3] The dorsal fin has 3 spines and 7–9 soft rays while the anal fin has 3 spines and 7–10 rays. The vertebrae count is 42–48. It can grow to 60 cm standard length but most fish are around 30 cm. [2]
These small scales give the Atlantic mackerel a velvet-like feel. The two dorsal fins are large and spaced far apart. The second dorsal fin is typically followed by 5 dorsal finlets, though it can have 4 or 6. The anal fin, which originates slightly behind the second dorsal fin, is similar to it in size and shape and is also succeeded by 5 finlets.