Salmon Sharks, Lamna ditropis
Description & Behavior
Salmon sharks, Lamna ditropis (Hubbs and Follett, 1947), are closely related to porbeagle sharks, Lamna nasus. Salmon sharks measure up to 3.7 m in length and weigh a maximum of 454 kg. They have heavy spindle-shaped bodies with short, blunt, conical snouts and large gill slits relative to their body size. Their first dorsal fin is dark in color. Their dorsal (upper) sides and flanks are dark blue to gray or black in color. Their ventral (under) sides are white with darker blotches or spots.
Salmon sharks have been observed both singly and in schools, usually feeding. This species is a very fast swimmer.
In the eastern North Pacific, female salmon sharks live up to 20 years, males to at least 27 years.
In the western North Pacific, males mature at about 1.77-1.86 m in total length and 5 years of age, and females mature at about 2.00-2.23 m when they are 8-10 years old…
Like other sharks in Lamnidae family, salmon sharks are endothermic, meaning they are able to thermoregulate, or maintain a body temperature above the temperature of the surrounding water. Most other marine life is ectothermic, which means they maintain an internal temperature that matches the surrounding water. Fast swimmers, like sharks and tuna, are more commonly endothermic…