Did you know that a little deep sea shark (classified as “Vulnerable”) is – due to the big portion of high-quality squalene in its liver oil – considered as “the Rolls-Royce of squalene-producing sharks” and targeted purposefully (whether legal or illegal doesn’t seem to matter)? Beside the here mentioned use of squalene in expencive cosmetics and dubious health capsules -where other squalene sources could easily be used instead – is it a (according to GSK without alternative) ingredient to medical products, too, like the flu vaccine adjuvant AS03. I don’t want to discuss the whole purpose of vaccines, or adjuvants, or the in Europe highly controversial pig flu vaccine of 2009, either – but it is to lament that many Gulper sharks (Centrophorus granulosus) were sacrificed pointlessly, since millions of swiftly produced and paid vaccine doses had to be destroyed later. And that in the case of a shark with the probably lowest reproductive rate of all sharks.

A photo of a gulper shark that has been caught.
Centrophorus granulosus, by NEFSC/NOAAPublic Domain

Female gulper sharks reach maturity at 14 and can live between 54 and 70 years long. Since they are pregnant with only one pup for 2 years and take long breaks in between, they typically have only between 2 and 10 pups in their lifetime. They are ovoviviparous and feed the embryo with yolk and unfertilised and also fertilised eggs (oophagy). The egg cell of the gulper shark reaches one of the largest cellular sizes described for any animal, weighing between 143 and 370 grams.

Living in the Atlantic, Pacific and Indian Oceans as well as the Mediterranean Sea, the Gulper shark is caught on longlines and by trawling (together with various other marine animals as bycatch). It is a highly migrating species and forms schools.

Sources: herehere and here

 

Advertisements