National Fisherman

A new study in Biology Letters—conducted by researchers at the Joint Institute for Marine and Atmospheric Research at the University of Hawaii, Ocean Discovery Institute, Comison Nacional Areas Protegidas and Pacific Islands Fisheries Science Center—announces the development of new technology that reduces bycatch rates by utilizing ultraviolet light.
 
To counter increasing bycatch rates, bycatch reduction technologies (BRT) have been created based on an animal's sensory cues and behavior. The scientists discovered that loggerhead (Caretta caretta) and leatherback (Dermochelys coriacea) sea turtles are sensitive to ultraviolet light wavelengths while many commercially important fish species have UV-absorbing compounds in their eyes that filter UV light. The scientists found that it is possible to exploit this disparity in visual capabilities to develop BRTs to prevent sea turtle bycatch.
 
"Understanding the sensory physiology of sea turtles and fish species helped us in choosing to use UV illumination," said Wang. "By using UV light, we have a used a selective means of communicating to sea turtles but not to fish."
 
According to a study, the scientists deployed 11 nets specifically designed to emit UV wavelengths, and found that illuminating gillnets with UV light reduced sea turtle capture rate while having no effect on the total target catch rate for commercial fisheries. In addition, the scientists note that visual-based BRTs can effectively reduce other types of bycatch; nets that are more visible also pose less risk to seabirds. At the time of this writing, testing of illuminated nets has begun in fisheries in Peru, Southern Baja California, Brazil and Indonesia.
 
Read the full story at Monga Bay>>

National Fisherman Live

National Fisherman Live: 11/06/14

In this episode:

NOAA report touts 2013 landings, value increases
Panama fines GM salmon company Aquabounty
Gulf council passes Reef Fish Amendment 40
Maine elver quota cut by 2,000 pounds
Offshore mussel farm would be East Coast’s first

 

Inside the Industry

Fishermen in Western Australia captured astonishing footage this week as a five-meter-long great white shark tried to steal their catch, ramming into the side of their boat.
 
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EAST SAND ISLAND, Oregon—Alexa Piggott is crawling through a dark, dusty, narrow tunnel on this 62-acre island at the mouth of the Columbia River. On the ground above her head sit thousands of seabirds. Piggott, a crew leader with Bird Research Northwest, is headed for an observation blind from which she'll be able to count them.
 
Read more...
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