The tin of tuna you buy could be linked to the accidental death of sharks, dolphins, turtles and seabirds.

Tuna fishing boats using longline and purse seine nets are mostly to blame.

That’s why we’re working to end the sale of tuna caught by these methods and encourage everyone to only buy tuna caught one at a time, by pole and line.

Thankfully many of the UK supermarket’s own brand tuna is caught by pole and line. Yet, alarmingly, supermarkets continue to sell branded tuna from Princes and John West that source their tuna from boats that are killing and throwing sharks, dolphins, turtles and seabirds overboard.

As consumers we can end this tragic situation. With your help we want to encourage supermarkets to stop presenting us with environmentally bad options and only sell tuna that has been caught by pole and line. And, at the same time, we want to let the big brands know that we will avoid tuna products caught by longline and purse seine nets.

Graham Buckingham, campaign director, said: “The popularity of tuna is encouraging big boats to hunt these fish on an industrial scale. As a result, sharks, turtles, dolphins and seabirds are dying in huge numbers for no reason. Bite-Back is not willing to allow this marine massacre to continue for the sake of a sandwich filling.

“Best of all it’s really easy for everyone to help by remembering one thing … if a tuna product doesn’t say it was caught by pole and line, CAN IT.”

In a bid to encourage the exclusive use of pole and line caught tuna across the UK, Bite-Back is busy investigating the provenance of tuna served by cafes, sandwich retailers, service stations, restaurants, airline, sushi bars, workplace canteens and even schools.