Reflective Journal 2 : ByCatch .

Dolphins and Yellowfin Tuna are frequently found swimming together. We believe the tuna are taking advantage of the dolphins' ability to find prey as they frequently feed on the same species. Although public pressure resulted in a reduction in dolphin deaths through purse seining it still continues. Today the greatest threat to dolphins and porpoises are bottom set gill nets and tangle nets.
Also , known as “ walls of deaths “ , an account for the deaths of thousands of animals annually around the globe but none worse than in the Western approaches to the UK and the southern Celtic Sea. Recent years have seen the employment of acoustic devices known as pingers designed to prevent small cetaceans approaching these gill nets . In the UK and Ireland it is now mandatory to fit pingers to bottom set gill nets but insufficient testing of these devices has resulted in little enforcement of this legislation with a result that thousands of animals are still being killed in this unsustainable and wasteful fishery.
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Takenfrom > http://whalewatchwestcork.com/dolphin-conservation.html