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In 2002, the dorsal fin of a stranded killer whale showed signs of collapse after three days but regained its natural upright appearance as soon as the orca resumed strong normal swimming upon release. [102] A study in 1998 recorded that 7 out of 30 (23%) adult male killer whales off the coast of New Zealand had abnormal dorsal fins.
Port and Starboard are a pair of adult male orcas notable for preying on great white sharks off the coast of South Africa. [1] The duo are identified as having rare and distinct collapsed dorsal fins and they are named for the nautical terms, as Port's fin collapses left and Starboard's collapses right. [2]
[24] [133] Nakai was one of the few captive males over the age of 10 to not have a collapsed dorsal fin, other males such as Ikaika and Trua are younger, have shorter fins, and have fully collapsed dorsal fins. Nakai's dorsal fin was nearly 5 feet (1.5 m) tall and was slightly leaning to the left.
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 ...
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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 dorsal fin has 11 spines and 14 soft rays while the anal fin contains 3 spines and 8 so rays. [3] The membranes between the dorsal fin spines are obviously incised. The pelvic fins are as long as or slightly longer than the pectoral fins while the caudal fin is truncate, the corners of the caudal fin are rounded in adults. [2]
The dorsal profile of the head is weakly to notably concave over the eyes with either a blunt or a pointed snout. The front nostril has a flap which becomes shorter as the fish grows and is reduced to a small peak in the oldest fishes. [8] The dorsal fin has 13 spines and 10 soft rays while the anal fin has 7 spines and 9 soft rays. [2]