Striped marlin 

(Tetrapturus audax)

Striped marlin inhabit tropical to temperate waters and can be found in ocean waters off all Australian states including Tasmania, but are more numerous in eastern Australia. They are a true oceanic species that prefer to inhabit cooler water than either the blue marlin (Makaira mazara) or black marlin (Makaira indica).

Striped marlin can reach a length of 4.2 metres and can weigh up to 200kg.

Striped marlin are a member of the family Istiophoridae. The body of striped marlin is more compressed compared to the more rounded body section of other marlin. The high pointed dorsal fin equals or exceeds the depth of the body and the pectoral fin can be folded flush against the body. Striped marlin have a longer lower jaw than other marlin species and display 12 to 16 light blue vertical bars along the body, which tend to remain after death. It is purple-blue in colour on the top of the body and silvery-white on the sides. This species is carnivorous and non-selective in its feeding habits. The diet of striped marlin is comprised mainly of surface fish such as squid, lancetfish, anchovy, pilchard, trevally, small tuna-like species and flutemouths.

Striped marlin have a clearly visible lateral line, which distinguishes them from blue marlin where the lateral line is almost invisible. Striped marlin also has a more compressed body structure and a longer lower jaw than that seen in either blue or black marlin. 

Sailfish
Istiophorus platypterus

Sailfish are rarely found outside the tropics, but have been found in the more southern waters of Australia's east and west coasts during the summer months. They are pelagic, seasonally migratory fish.

Sailfish can reach a maximum length of 3.6 metres and weight of 60kg.

Sailfish are a member of the family Istiophoridae and are easily identified by their distinctive cobalt blue, sail-like dorsal fin, which stands twice as high as the body is deep. The upper body is dark purple and the lower body is a paler silvery blue. The bill is long and slender and usually rough to touch. Sailfish generally feed on pilchards, yellowtail, tailor and other baitfish species.