Unexpected Effect: Scientists Attached Trash to Nets and Saved Dolphins

Scientists at Newcastle University have discovered that plastic bottles attached to fishing nets serve as sound reflectors for dolphin echolocation. Trials in Peru, Zanzibar, and Brazil showed that in Brazil, the method reduced accidental dolphin deaths by 88% without reducing fish catch.

Scientists at Newcastle University, led by Professor Per Berggren, have proposed a simple solution to protect dolphins from accidental death in fishing nets. Plastic bottles attached to nets reflect dolphins' ultrasonic signals, making the nets visible. Trials on over 1,600 nets in Peru, Zanzibar, and Brazil showed that in Brazil, the method reduced dolphin mortality by 88% without affecting catch volumes. In Peru, bottles did not affect dolphin bycatch but increased fish and shark catch. In Zanzibar, no dolphins were caught in either control or experimental nets. The scientists emphasize the method's low cost and simplicity, recommending its adoption in other regions. The article was published in BBC Wildlife Magazine.