While they aren鈥檛 an uncommon sight in B.C. waters, marine scientists were amazed by the way a particular shark behaved during a recent expedition.
A two-meter long salmon shark was spotted by a science team from Fisheries and Oceans Canada, the Nuu-chah-nulth Nations and other partner organizations while they were on a two-week expedition. The male shark was captured on video, 鈥渉eaving itself onto, and sliding along, a barnacle-encrusted log adrift at sea.鈥�
Researchers described the behaviour as extremely rare, and believe the shark was attempting to remove the large, visible parasites from its body and fins. These parasites are known as copepods, and are detrimental to the shark鈥檚 health and swimming efficiency.
The Pacific Seamounts Expedition team believes this is the first-ever recording of this type of behaviour in salmon sharks. The event was observed by Josh Watts (Nuu-chah-nulth Nations) and Cherisse Du Preez (Fisheries and Oceans Canada), as well as the Canadian Coast Guard crew.
Salmon sharks have a short and heavy body, with a length up to three metres, and are black or dark grey on the top with white blotches on the bottom. They also have a short snout with awl-shaped teeth that have small, sharp denticles on each shoulder of the main point. An apex predator, they are known to feast on salmon, squid, sablefish and herring.
According to the Alaska Department of Fish and Game, salmon sharks are closely related to great white sharks and can swim up to 50 miles per hour. They can also, 鈥渞egulate their body temperature 14 to 20 degrees Fahrenheit above the ambient water temperature.鈥�
The Pacific Seamounts Expedition set out on July 16聽to explore Canada鈥檚 largest underwater volcano 鈥� the Explorer seamount 鈥� at the center of a potential . This mission will expand the knowledge of the 2018 Expedition where many species unknown to science were discovered that were once unknown to science.
Last year, a shark was spotted in the shallow water at the foot of Bayswater Street, a few blocks west of Kits Beach. Lee Newman, 麻豆传媒映画Aquarium鈥檚 curator of fishes, told V.I.A. that while it鈥檚 hard to tell from the photo it鈥檚 likely a Pacific spiny dogfish shark.
If you encounter a Salmon Shark, you are encouraged to report the encounter to the Department of Fisheries and Oceans.
