This 2014 video says about itself:
From the University of Exeter in England:
Endangered sharks being eaten in UK
January 31, 2019
University of Exeter scientists sampled shark products from fishmongers and chip shops, as well as shark fins from an Asian food wholesaler in the UK.
The majority of chip shop samples (usually sold under generic names like huss, rock salmon and rock eel) were spiny dogfish — a species “endangered” in Europe and “vulnerable” worldwide.
The fin samples included scalloped hammerheads — “endangered” globally and subject to international trade restrictions.
The researchers have called for more accurate food labelling so people know what species they are eating.
“The discovery of endangered hammerhead sharks highlights how widespread the sale of declining species really is — even reaching Europe and the UK“, said Dr Andrew Griffiths, of the University of Exeter.
“Scalloped hammerhead can be imported under strict conditions, but the wholesaler had no idea what species the fin belonged to.”
The analysis of chip shop samples also identified globally threatened shark species.
Fishing for spiny dogfish has been prohibited in most circumstances under EU rules. The spiny dogfish found in many chip shop samples could have been sourced from more sustainable stocks elsewhere, but it highlights the problems of selling shark meat under “umbrella” terms that cover multiple species.
“It’s almost impossible for consumers to know what they are buying,” said first author Catherine Hobbs, also of the University of Exeter.
“People might think they’re getting a sustainably sourced product when they’re actually buying a threatened species.
“There are also health issues. Knowing what species you are buying could be important in terms of allergies, toxins, mercury content and the growing concern over microplastics in the marine food chain.
“Our findings demonstrate the need for more informative and accurate seafood labelling.”
Through “DNA barcoding” the study analysed 78 samples from chip shops and 39 from fishmongers, mostly in southern England, as well as 10 fins from a wholesaler.
Miss Hobbs added: “Knowledge of shark species consumption in the UK, especially those of prohibited species and those of high conservation concern, enhances our ability to address the decline in shark populations.”
Total number of sharks and rays caught annually by small-scale fisheries in the South West Indian Ocean is estimated to be 2,500,000 individuals — 73% more than officially reported: here.