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Scientists Say NMFS Study Determined to be Inconclusive in Western Pacific Longline Fishery

March 18, 2022 — Sorry, Charlie: Weak hooks in the Hawai’i deep-set longline fishery for bigeye tuna won’t reduce impacts to false killer whales, scientists said when they met virtually this week.

The Western Pacific Regional Fishery Management Council’s Scientific and Statistical Committee found that a National Marine Fisheries Service 2021 “weak hook” study was inconclusive. Further, it did not provide scientific support for adopting weaker hooks as the primary strategy for reducing impacts to false killer whales, the WPRFMC said in a press release.

The study investigated the economic impacts of existing weak (4.5 mm diameter) and comparatively weaker (4.2 mm) hooks on target catch, primarily bigeye tuna. The study results showed the weight and value of bigeye tuna was higher for those caught on existing hooks than the weaker hooks.

Read the full story at Seafood News

Western Pacific Scientists Found “Weak Hook” Study Inconclusive as a False Killer Whale Mitigation Strategy

March 16, 2022 — The following was released by the Western Pacific Regional Fishery Management Council:

The Scientific and Statistical Committee (SSC) found that a National Marine Fisheries Service 2021 “weak hook” study was inconclusive and did not provide scientific support for adopting weaker hooks as the primary strategy for reducing impacts to false killer whales (FKWs) in the Hawai‘i deep-set longline fishery. The study investigated the economic impacts of existing weak (4.5 mm diameter) and comparatively weaker (4.2 mm) hooks on target catch, primarily bigeye tuna. The study results showed the weight and value of bigeye tuna was higher for those caught on existing hooks than the weaker hooks. 

The SSC noted that the weak hook approach is a flawed strategy that has been ineffective, highly stressful to FKWs and dangerous for fishermen as it necessitates creating tension on the line to attempt hook straightening. FKWs may become hooked on longline fishing gear because the whales feed on bait and fish caught on the line. Interactions between the Hawai‘i deep-set longline fishery and FKWs are rare—on average less than 10 are observed hooked or entangled each year.

SSC members reiterated their previous position that a better strategy would be to cut the line as close to the hook as possible so that the animal can be released quickly with minimal trailing gear that may cause further injury. “Gear release mechanisms that slide down the fishing line to cut near the hook are undergoing development and would be a better option than using weaker hooks,” said David Itano. “The fleet’s transition to monofilament nylon leaders is a game changer,” added Craig Severance. “It will allow fishermen to use simpler, less expensive line-cutting devices.”

Under the False Killer Whale Take Reduction Plan, fishermen are required to use 4.5 mm or less diameter wire hooks intended to straighten and release accidentally hooked FKWs, while retaining bigeye tuna and other fish species of market value. However, this weak hook has not been successful, with only approximately 10% of the interactions resulting in the hook straightening since the Plan’s implementation in 2013.

The SSC also heard a report on American Samoa Bottomfish Fisherman Data Workshops held in February 2022. SSC members emphasized that the information gleaned from these workshops would be helpful for the 2023 stock assessment.

The workshops highlighted several data issues, such as difficulties with distinguishing between similar species and gaps in data caused by lack of data collection, not lack in catches. Workshop participants included commercial and noncommercial fishermen, village leadership, and American Samoa Dept. of Marine and Wildlife Resources, Pacific Islands Fisheries Science Center and Council staffs. Fishermen provided both current and historical (1960s and ‘70s) bottomfish fishery insights that will help scientists to resolve discrepancies in the data for the 11 managed bottomfish species.

The SSC meeting continues tomorrow with discussions on 2021 Hawai‘i and American Samoa longline fishery status, area-based management and a new Pacific strategy for addressing international fishery management issues.

 

Western Pacific Scientists to Discuss Research on Area-Based Management and “Weak Hooks” as a Mitigation Strategy

March 10, 2022 — The following was released by the Western Pacific Regional Fishery Management Council:

Scientists across the Western Pacific Region will meet virtually March 15 to 17, 2022, to provide advice and comments to the Western Pacific Regional Fishery Management Council on area-based management, a weak hook study, American Samoa bottomfish data workshops and other topics. The Council’s Scientific and Statistical Committee (SSC) meeting will be held virtually and is open to the public. The full agenda, background documents and instructions for connecting to the meeting and providing oral public comments are available at https://www.wpcouncil.org/event/143rd-scientific-and-statistical-committee-virtual-meeting.

Area-Based Management

The SSC will discuss recently published papers on area-based management (ABM) that investigate the balance of conservation objectives under new domestic and international policies. Council and SSC members have developed and contributed to several publications that investigate the trade-offs of closed areas for protecting biodiversity versus optimizing fishing yields with the smallest amount of bycatch. SSC members and Council staff also published works demonstrating the applicability of dynamic versus static ABM tools with respect to objectives and the dynamic nature of the pelagic ecosystems that dominate Council-managed waters.

Weak Hook Study

The SSC will weigh in on next steps for the False Killer Whale Take Reduction Plan after considering a new study comparing the economic impacts of using relatively weaker hooks (4.2 mm diameter) to existing hooks (4.5 mm diameter) in the Hawaii deep-set longline fishery. The committee will advise the Council whether the study provides scientific evidence to adopt weaker hooks, which are intended to straighten to release accidentally hooked false killer whales, while retaining bigeye tuna and other fish species of market value.

The Council’s previous position on a preferred mitigation strategy was to focus on removing trailing gear from the animals as close to the hook as possible. Discussions will guide the Council in developing an updated position in preparation for the False Killer Whale Take Reduction Team meeting, which is expected to take place later in 2022. The Team includes representatives from the Council, various government agencies, and fisheries, academic and environmental groups.

American Samoa Bottomfish Data Workshops

The SSC will hear a report on data workshops held with Pacific Island Fisheries Science Center (PIFSC), Council and American Samoa Department of Marine and Wildlife Resources staffs and fishermen held in Tutuila and Manu‘a. Fishermen provided insights and input on data to be used in the next American Samoa bottomfish benchmark stock assessment to be completed in 2023. The workshops were the first in a series of steps to improve data collection in the U.S. Pacific Territories.

Recommendations made by the SSC on these and other matters will be considered by the Council when it meets March 22-24, 2022, virtually, with host sites at Tedi of Samoa Building, Suite 208B, Fagatogo Village, American Samoa; BRI Building, Suite 205, Kopa Di Oru St., Garapan, Saipan, Commonwealth of the Northern Mariana Islands (CNMI); and Cliff Pointe, 304 W. O’Brien Dr., Hagatña, Guam. Instructions on connecting to the web conference, agendas and briefing documents are posted at https://www.wpcouncil.org/meetings-calendars. Host sites are subject to local and federal safety and health guidelines regarding COVID-19; check the Council website for updates.

Scientific and Statistical Committee: James Lynch (Sierra Pacific Industries) (chair); Debra Cabrera (University of Guam); Frank Camacho (University of Guam); Milani Chaloupka (University of Queensland); Erik Franklin (University of Hawai‘i, School of Ocean and Earth Science and Technology); Jay Gutierrez (Guam Division of Aquatic and Wildlife Resources); Shelton Harley (Minister of Fisheries, NZ); Jason Helyer (Hawai‘i Division of Aquatic Resources); Ray Hilborn (University of Washington); Justin Hospital (National Marine Fisheries Service (NMFS) PIFSC); David Itano (fisheries consultant); Donald Kobayashi (NMFS PIFSC); Steve Martell (SeaState, Inc.); Domingo Ochavillo (American Samoa Department of Marine and Wildlife Resources); Graham Pilling (Secretariat of the Pacific Community); Kurt Schaefer (Inter-American Tropical Tuna Commission); Craig Severance (University of Hawai‘i at Hilo, retired); Michael Tenorio (CNMI Division of Fish and Wildlife); and Michael Seki (ex-officio) (NMFS PIFSC).

Western Pacific Regional Fishery Management Council: Secretary of Commerce appointees from nominees selected by American Samoa, CNMI, Guam and Hawai‘i governors: Roger Dang, Fresh Island Fish Co. (Hawai‘i) (vice chair); Manny Dueñas, Guam Fishermen’s Cooperative Association (Guam) (vice chair); John Gourley, Micronesian Environmental Services (CNMI) (vice chair); Will Sword, noncommercial fisherman/engineer (American Samoa) (vice chair); Monique Amani, business owner (Guam); Howard Dunham, commercial fisherman (American Samoa); Matt Ramsey, Conservation International (Hawai‘i); and McGrew Rice, charter boat captain (CNMI). Designated state officials: Anthony Benavente, CNMI Dept. of Lands and Natural Resources; Suzanne Case, Hawai‘i Dept. of Land & Natural Resources; Chelsa Muña-Brecht, Guam Dept. of Agriculture; and Archie Soliai, American Samoa Dept. of Marine & Wildlife Resources (chair). Designated federal officials (voting): Michael Tosatto, NMFS Pacific Islands Regional Office. Designated federal officials (nonvoting): Charles Brinkman and Rebecca Wintering, U.S. Dept. of State; Brian Peck, U.S. Fish and Wildlife Service; and RADM Matthew Sibley, U.S. Coast Guard 14th District.