Whale entanglements bring new ideas for fishing gear

Whale entanglements off the West Coast and potential solutions to the escalating problem are the focus of a new report compiled by fishermen, biologists, and fisheries managers who gathered at an August workshop on the subject.

2017 Whale Entanglements

In a release from NOAA Fisheries, the growing populations of humpback and gray whales, changing ocean conditions and prey locations, and later crab season openings have led to more whales becoming entangled in fishing gear. They say that in 2017 there were 31 confirmed entanglements off the West Coast.  While the entanglements are still proportionally rare, they sometimes lead to the deaths of entangled whales, and that led both fishermen and fisheries managers to seek solutions.   

The report was released following a two-day workshop featuring the Pacific States Marine Fisheries Commission (PSMFC) and NOAA Fisheries’ West Coast Region.  This “forensic workshop” was also supported by The Marine Mammal Commission, Oregon Sea Grant, and the Aquarium of the Pacific.

The report provides the notes and presentations from 31 Washington, Oregon, and California experts who attended.

Participating were Dungeness crab fishermen; gear specialists; marine mammal biologists and disentanglement specialists; conservation groups; and federal, tribal, and state agency representatives.

Participants reviewed the best practices documents each state has developed in light of forensic review information presented, discussed possible improvements in gear marking that would help better identify entangling gear, and discussed potential gear modifications or research that might help reduce the number of entanglements.

NOAA Fisheries’ Dan Lawson explained that, “Though the workshop did not seek consensus from the participants, there were a number of things that seemed to have broad participant support.”  For example, there was strong support for establishing a repository where gear removed from entangled whales could be stored after evaluation. “Fishermen really wanted to continue to engage with the whale experts on this forensic review work.  They saw real value in this,” he said.

Other actions that could help minimize whale entanglements were discussed, including:

  • improving gear markings, and coordination between the states, to better identify the origins of gear involved in entanglements;
  • exploring alternative ways to connect buoys and lines on the gear to minimize the use of knots and splices, especially on upper portions of gear where entanglements appear to often occur;
  • assuring wider dissemination of the best practices guidelines that address the use and scope of vertical lines and other ideas to commercial and recreational fisherman; and
  • working to better understand the physics related to the tension and drag forces of gear components, and how those forces may relate to entanglements.

The participants also expressed interest in a gear innovation developed by fishermen in the lobster fishery on the East Coast.  This involves a hollow sleeve around lines to help avoid knots and splices that get caught up in the whales’ baleen and create a weaker spot in the line that the whales could break.

Fran Recht, PSMFC Whale Entanglement Reduction Program manager, works with fishermen to test gear innovations.  “We had 10 fishermen, some from each state, come forward to test this idea. They have to make sure it is practical, holds up well under use and works within existing operations, but it looks promising as-is or could be adapted to better fit West Coast conditions,” she said.

FOR MORE INFORMATION:

PSMFC Forensic Review Workshop Report and related information

http://habitat.psmfc.org/preventing-whale-entanglement/

NOAA Fisheries West Coast Region Large Whale Entanglement Response Program

https://www.westcoast.fisheries.noaa.gov/protected_species/marine_mammals/entanglement_faq.html

NOAA Fisheries West Coast Marine Mammal Disentanglement Network

https://www.westcoast.fisheries.noaa.gov/protected_species/marine_mammals/disentanglement_network.html

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