How Do Dolphins Die By Fishing Nets? How Do They Get Caught In Them?
How do dolphins die by fishing nets? How do they get caught in them?
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dolphins breath air. they get caught in drift nets or trawling nets, and they are unable to come up for air and they die from lack of oxygen.
Anything which swims can get caught in drift nets. Fish which need to swim to breathe (tuna and sharks) and creatures which need to surface to breather (whales, dolphins, seals, sea lions, and turtles) drown. These nets can be left out for days, so just about anything which is caught in them is dead by the time the net is checked. But drift nets aren’t a big problem for dolphins.
But dolphins have another problem: they tend to travel with yellowfin tuna. Fishermen know this, so that if they spot a bunch of dolphins, they know there’s a chance of tuna mixed in. If they see the tuna on their sonars, they wrap a purse-seine net around the mixed school. The dolphin tend to panic and try to dive out of the bottom of the net, before it closes, but they often get tangled. By the time the net is hauled up close to the boat to transfer the fish onboard, it’s too late and the dolphins have drowned.
There have been various methods used to try to save the dolphin, including deploying divers to herd them out of the net, but now the main method is to not to pull the net tight and load the fish into the boat, but to transfer the live tuna into a floating holding pen which is then towed to a larger factory ship for processing. This allows the release of any “live bycatch” (including dolphins, tuna which are too small for processing, and other species).
One link below is from a commercial tuna fishing website, the other describes the “Dolphin-Safe” certification.
Dolphins die by fishing nets because they chase smaller bait fish which escape through the net mesh and dolphins drown once they get trapped or entangled. They don’t have gills like other fish, that’s why they’re called mammals.
Fishing industries are becoming more aware of this horrific problem and doing two things. They make nets to have “break-away” knots and use a underwater sounding device that is uncomfortable to the dolphins hearing and drives them off when dolphins are spotted in the area.
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They get caught up in the nets, usually drift nets, and suffocate or drown.
They swim with the tuna, get caught, then they stay out of the water too long.
Yes they die in them, they drown.