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The bill movement of sailfish during attacks on fish is usually either to the left or to the right side. Identification of individual sailfish based on the shape of their dorsal fins identified individual preferences for hitting to the right or left side. The strength of this side preference was positively correlated with capture success. [19]
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 sailfin tang has its dorsal fin supported by 4 or 5 spines and between 29 and 33 soft rays while its anal fin is supported by 3 spins and 23 to 26 soft rays. [2] It has a disc shaped body with very high dorsal and anal fins and when its fins are fully extended, the total height of the fish is almost equal to its length.
It is theorized by marine biologists that the 'sail' (dorsal fin array) of the sailfish may serve the purpose of a cooling and heating system for this fish; this due to a network of a large number of blood vessels found in the sail and because of "sail-raising" behaviour exhibited by the sailfish at or near the surface waters after or before ...
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 ...
Sailfin mollies are small fish. At one year of age, males typically range in size from 0.5 to 3 in (13 to 76 mm) SL, while mature females are likely to be 0.5 to 2.5 in (13 to 64 mm) inch SL. The size of adult males is directly correlated with population density. The greater the population, the smaller the average size of males.
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 Atlantic sailfish is a metallic blue fish with a large sail-like dorsal fin and a long and pointed bill-like snout. It is dark bluish-black on the upperparts and lighter on the sides (counter-shading), with about twenty bluish horizontal bars along the flanks; the underparts are silvery white. The tail fin is strongly forked.