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Marine mammal bycatch in gillnet fisheries, 1990-2011

Since the 1970s, fisheries bycatch has been increasingly recognized as a factor responsible for reducing or liminiting the recovery of marine mammal populations in many parts of the world. A new study from the Consortium for Wildlife Bycatch Reduction reviews reported marine mammal bycatch from the last two decades. 

Techniques for Reducing Marine Mammal Bycatch in Gillnets

Endangered Species Research Theme Section 


Bycatch in gillnets poses a serious threat to many marine mammals around the world. A new Theme Section in Endangered Species Research evaluates techniques to reduce marine mammal bycatch, including:

Addressing Bycatch in Artisanal Gillnet Fisheries

Workshop report from the 19th Biennial Conference on the Biology of Marine Mammals
 

While most of the research and development of bycatch reduction methods is focused in developed nations and commercial fisheries, some of the most severe coastal gillnet bycatch challenges are likely to be found in artisanal gillnet fisheries in developing nations. Efforts to address challenges in these coastal regions are stymied by a lack of information on the extent of the bycatch problem and the status of the species affected, as well as by social, cultural and economic factors that can cause artisanal fishing communities to resist implementing mitigation measures.

Large Whale Entanglements

Freeing Tangled Leviathans: The Whale Wrangler

Scott Landry, Director of the Whale Rescue Team at the Provincetown Center for Coastal Studies, and a partner on many of the Consortium's research projects, was recently in the Pacific Standard's article The Whale Wrangler.

Watch Large Whale Entanglement Simulator Video

New type of gillnet may help endangered dolphins

The Consortium's research on barium sulfate gillnets to reduce bycatch of Brazil's endangered franciscana dolphin was featured in the Brazilian newspaper O GLOBO, "Novo tipo de rede promete ajudar a proteger toninhas" 


Bycatch in gillnets is a serious threat to the franciscana dolphin (Pontopoia blainvillei), Brazil's most endangered dolphin. Gillnets are virtually invisible barriers for these dolphins, who frequently get trapped and drown in them. 

Lobster Pot Gear Configurations in the Gulf of Maine

Report documents the range of lobster fishing methods in the Gulf of Maine for the first time


The Consortium for Wildlife Bycatch Reduction has been working collaboratively with the Maine Lobstermen's Association (MLA) to identify innovative fishing gears and methods that are practical for fishermen but also reduce the frequency and severity of large whale entanglements from vertical lines (ropes that extend from the ocean surface to the trap on the ocean bottom).

Shark Behavioral Responses to Deterrents

Jordan, LK, Mandelman, JW and Kajiura, SM. 2011. Behavioral responses to weak electric fields and lanthanide metal in two shark species. Journal of Experimental Marine Biology and Ecology 409(1-2): 345-350.


Sharks are the main bycatch group for pelagic longline fisheries. Shark interactions with fisheries can have negative financial and safety consequences for fisheries and are destructive to shark populations. A product that could deter sharks from fisheries that has no negative effect on the target fish would benefit both fisheries and shark populations.

Boston Globe Editorial on Bycatch

The Consortium for Wildlife Bycatch Reduction was recently featured in an August 27, 2011 editorial in the Boston Globe, "Saving Millions of Fish".

The Consortium for Wildlife Bycatch Reduction was recently featured in an August 27, 2011 editorial in the Boston Globe, "Saving Millions of Fish".

Fishermen and conservationists both want to avoid bycatch.

New York Times: "Fishing Gear is Altered to Ease Collateral Costs to Marine Life"


The Consortium for Wildlife Bycatch has been featured in the August 22, 2011 New York Times Science article, "Fishing Gear is Altered to Ease Collateral Costs to Marine Life".  

"The seafood on your plate is not the only animal that gave its life to feed you," is one of the messages from Tim Werner, the director of the Consortium for Wildlife Bycatch Reduction. While fishing for tuna, lobster, or other tasty seafood, we catch, injure, and kill other fish, marine mammals, sea turtles, sea birds, and invertebrates.


The Consortium for Wildlife Bycatch has been featured in the August 22, 2011 New York Times Science article, "Fishing Gear is Altered to Ease Collateral Costs to Marine Life".  

"Weak" Circle Hook Requirement Proposed in Hawaii

NMFS is recommending that "weak" circle hooks, sized 16/0 or smaller, be required in the Hawaii-based deep-set longline fishery. "Weak" hooks are designed to retain the target catch, but release larger bycatch, like false killer whales (or bluefin tuna in the Gulf of Mexico or pilot whales in North Carolina). The hooks release larger animals by straightening out when the animal puts tension on the line.

In July, the National Marine Fisheries Service (NMFS) posted the Draft False Killer Whale Take Reduction Plan, which proposes new regulations to protect false killer whales in Hawaii, which are currently being considered for listing as endangered under the Endangered Species Act. The Hawaiian false killer whale population has drastically declined over the last two decades.

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