Saving Seafood

Pacific Scientists Support Streamer Lines to Reduce Albatross Interactions with Tuna Fishery

September 15, 2021 — The following was released by the Western Pacific Regional Fishery Management Council:

The Scientific and Statistical Committee (SSC) of the Western Pacific Regional Fishery Management Council strongly supported a study that found tori lines are far more effective than blue-dyed fish bait for seabird bycatch mitigation.

The tori line study was conducted from February to June 2021 under an experimental fishing permit from the National Marine Fisheries Service (NMFS). Tori lines (also known as bird scaring lines or streamer lines) have shown promise in reducing incidental interactions with seabirds in the Hawai‘i deep-set longline fishery. The permit allowed tori lines to be tested without the use of blue-dyed bait, which is an existing seabird mitigation requirement in the fishery that has been shown to be less effective than other required measures over time.

The project is a collaboration between the Council, NMFS and the Hawaii Longline Association. The field experiment comprised 87 sets deployed during seven trips from three Hawai‘i-based commercial longline vessels. Participating vessels alternated sets between the two methods each day and carried a video-based system that electronically monitored seabird behavior.

Results showed that Laysan and black-footed albatross were 1.5 times less likely to attempt to attack, and 4 times less likely to contact baited hooks when tori lines are set versus when fishermen use blue-dyed bait. Ultimately, this leads to the seabirds being 14 times less likely to be hooked.

Study author and SSC member Milani Chaloupka noted that “tori lines are economical, fishermen like them and the improved design has reduced entanglement with fishing gear.”

A report from an earlier tori line project in 2019-2020 is available here: https://tinyurl.com/torilinesreport.

The SSC meeting continues through Thursday, Sept. 16, 2021. Instructions on connecting to the web conference, agenda and briefing documents are posted at www.wpcouncil.org/event/141st-scientific-and-statistical-committee-virtual-meeting.

 

Satellite Study Says Tuna Longliners Vastly Misreporting Compliance with Sea Bird Avoidance

February 4, 2019 — SEAFOOD NEWS — Seabirds, in particular birds like albatross, are highly vulnerable to longlines, and in some fisheries managed by the US, take of a single bird can shut down the fishery.

The IUCN (International Union for the Conservation of Nature) lists 15 of 22 albatross species as endangered.

To mitigate bycatch, the RFMO’s in the Indian Ocean, Western Pacific, and the Atlantic have mandated measures to prevent bird interactions with longlines, such as night setting, use of weighted lines to sink faster, and use of streamers to keep birds away during setting.

However, the RFMOs depend on vessel self reporting.  Apparently a large number of vessels are lying about their mitigation measures.

According to a study of satellite data released by Birdlife International, only 15% of tuna longline vessels are using night setting, the single bycatch reduction measure most effective for albatross.

But the industry has been reporting compliance with night setting at levels between 29% and 85%, depending on the fishing area.

The study looked at satellite data for 201 vessels, analyzing their movement, speed, direction of travel and time, to determine when they were night setting.  The results showed only 15% of the vessels were actually using the practice.

The findings offered a stark contrast with reports given by countries to fisheries watchdogs that suggested night-setting was used at a much higher rate by  fleets.

“The results are very disappointing,” said Stephanie Winnard, a biologist with the albatross task force, a specialist unit set up by Birdlife International and the Royal Society for the Protection of Birds. “By this stage you would expect a lot more vessels to be using night setting.”

The aim of the research was to encourage best practice, to which end the results will be shared with the countries whose vessels were studied.

Albatrosses, petrels and other seabirds are “irresistibly drawn” to the trailing, baited longlines, said Winnard. Each year, an estimated 100,000 birds are hooked and drowned by longline and trawl fisheries.

“This level of bycatch in the fishing industry is hugely unsustainable for birds that can take up to 10 years to start breeding,” said Winnard, who added that the findings were “truly powerful” for the way the data shed light into the “opaque world” of global fisheries and their impact on ocean biodiversity.

“No one is going to report they are not sticking to the rules or they are killing seabirds, so we now have this independent way of measuring compliance,” said Winnard. “This information has never before been public. It is usually kept behind closed doors. It will promote transparency and hold countries to account. It is the first time we’ve been able to see what is happening on individual fishing boats.”

This story was originally published by SeafoodNews.com, a subscription site. It is reprinted with permission.

Fishermen, researchers try to outsmart bait-robbing seabirds to save them

October 24, 2017 — When commercial fishermen spool out long lines in pursuit of sablefish— better known to consumers as black cod — seabirds looking for an easy meal dive to steal the bait off the series of hooks.

Some unlucky birds get hooked and drown as the line sinks to the deep. And when the drowned bird is an endangered species such as the short-tailed albatross, it triggers scrutiny.

“Just one was all it took. Yeah, just one,” said Amanda Gladics, a coastal fisheries specialist with Oregon Sea Grant. “Because they are endangered there is a lot of scrutiny on every single time any of those albatrosses are caught in a fishery.”

Gladics and colleagues from Oregon and Washington went to sea to determine the best tactics to avoid bycatch and published those in the journal Fisheries Research.

The paper recommends either fishing at night or deploying bird-scaring streamers on a line towed from a mast.

Read the full story at KTOO Public Media