Basking Sharks (Cetorhinus maximus)
Basking Sharks are the 2nd biggest fish in the ocean. (whale sharks are the biggest)
A basking shark can grow to over 10m (33 ft) long and weight several tons. Their mouth can open 1 metre wide for feeding on plankton. They filter fed on the plankton by sieving out the minuscule animals from the water column using special gill rakers. These rakers are specially adapted bone which sit in the sharks gills and act in a similar fashion as baleen in fliter-feeding whales. They are efficient and can filter up to 1.5 million litres of water her hour.
Scotland has some of the richest cold waters in the world and every spring the oceanic and weather cycles create optimal conditions for explosive blooms of plankton. The sharks migrate from their winter feeding grounds to feast on the plankton and for mating.
We will be looking for basking sharks and snorkeling with them this July 2016. Join our Basking Shark Snorkel
Historically basking sharks have been a staple of fisheries because of their size, (former) abundance, and slow movement. Today basking sharks are still hunted all over the world for their livers containing a vast amount of oil. The oil is used in cosmetics, perfume and lubricants. Synthetics and conservation efforts have stopped the hunting in some places and they are now protected. They are also victims of the shark fin trade.
Basking Sharks are a cosmopolitan migratory species, found in all of the world’s temperate oceans. In additon they prefer to swim close the shore and also enjoy swimming near the water’s surface swimming at a slow pace while they filter. They travel through the Mediterranean Sea, Pacific and Atlantic ocean, sea of Japan, New Zealand, and Southern Australia. Nova Scotia and New Brunswick are great places to spot them as well. At times they travel in groups of about 100 but also are most often seen traveling alone.
Like many sharks, ovoviviparous basking sharks develop embryos which first rely on a yolk sac with no placental connection and develop inside the female. Gestation is unknown but might be a year or more. The small young are born fully developed at 1.5 – 2m. From the only pregnant mother ever caught we learned that the brood can be six pups. The lifespan is not known. Experts estimate about 50 years.
More about Basking Shark Conservation Efforts