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Global analysis reveals where fishing vessels turn off their detection devices

Global analysis reveals where fishing vessels turn off their detection devices

Global analysis reveals where fishing vessels turn off their detection devices

Global analysis reveals where fishing vessels turn off their detection devices

This map shows the estimated total fishing vessel activity and the amount of this activity obscured by the suspected disabling of the automatic detection system in areas with sufficient satellite reception. Areas with the highest fishing vessel activity and the highest degree of unexplained activity occur in three areas of concern for illegal, unreported and unregulated fishing: near Argentina and West Africa, and in the Pacific Northwest. In contrast, fisheries in the waters near Alaska are some of the most intensively managed in the world. credit: Global Fishing Watch

Data from the Shipboard Automatic Identification System (AIS), which was created as a collision avoidance tool, can provide information about global fishing activity, including illegal, unreported and unregulated fishing. Fishing vessels can disable their AIS equipment, but a new analysis identifies intentional disabling incidents in commercial fisheries and shows that, while some disabling incidents can occur for legitimate reasons, others are illegal. There seem to be attempts to hide the activities.


The new study, published November 2 science advanceIntroducing the first global dataset of disabling AIS commercial fishingwhich obscures vessel activity by up to 6%.

First author Heather Welch, a project scientist in the Marine Science Institute at UC Santa Cruz, worked on the study with researchers from Global Fishing Watch, which maintains the AIS dataset of vessel activity, and NOAA fisheries. After Global Fishing Watch developed a way to distinguish it from intentional disabling in satellite coverage and other technical issues, Welch used a machine learning method to identify the four primary reasons for disabling AIS.

“There are some valid reasons why ships disable their AIS, but we found two situations in which it is done for potentially nefarious reasons, either fishing in unauthorized locations or to obscure unauthorized transshipment,” she said. “This dataset is now operational, and the data is generated in real time, so it can be used to target inspections and improve fish management,

For the study, researchers identified more than 55,000 suspected intentional disabling incidents between 2017 and 2019 that obscured nearly 5 million hours of fishing vessel activity. Of the total hours obscured by suspected AIS inaction, more than 40% occurred in four hotspots, three of which are areas of concern. illegal fishing: Pacific Northwest and regions adjacent to the Special Economic Zones (EEZs) of Argentina and West African countries. These areas have rich fishing grounds with limited management oversight.

“AIS data can tell us a lot, but it can also be lacking,” said co-author Tyler Clawell, a data scientist at Global Fishing Watch. “We may not always be able to see what ships are doing, but knowing that they are deliberately concealing their movements provides valuable information that managers and scientists did not have before. Having a better understanding of concealment allows officers to deploy valuable-water resources More strategically, supporting better fisheries management.”

Incidents of disabling were concentrated in waters adjacent to EEZ boundaries, suggesting that ships may disable AIS before entering unauthorized locations for illegal fishing. Welch said that in many cases, ships go dark as they approach the edge of the EEZ where they are not authorized to fish. “For example, you can see a Korean-flagged ship heading towards Argentina, and then it goes dark in international waters outside Argentina’s EEZ,” she said.

In particular, disabling was particularly common with overlapping claims within and around the EEZ, such as the Falklands/Malvinas Islands which are disputed by the UK and Argentina. Political conflicts in these areas can create blind spots for enforcement.

Incidents of disabling were also common in areas with high transshipment activity, where boats transfer their catches to refrigerated cargo ships. Transshipment can be an efficient way to get the ship back to shore and resume fishing quickly, but it can also be used to obscure illegal fishing activity, illegal through cargo. The catch can be effectively “laundered”. Vessel, In addition, it could enable forced labor on fishing boats that never go to ports.

The study also found evidence that ships engaged in legal activities do some incapacitation for legitimate reasons. In some cases, Welch said, AIS can be disabled to hide the locations of good fishing grounds from competitors. The fourth disabling hotspot was caused by the disabling of US trawlers in US waters off the coast of Alaska. “It is one of the most intensively managed fishing grounds in the world, and these incidents likely constitute a hiding place from competitors,” she said.

Another valid reason to disable AIS is piracy protection. Welch said, “Using a database of historical attacks, we can see that ships have set off AIS in these historically dangerous waters, and this may be why pirates are able to track and intercept them.” Don’t be.”

The approach demonstrated in this study can be used to support surveillance and enforcement efforts.

“This new dataset is an untapped resource that provides a real opportunity to trace previously observed behavior and illegal fishing activities,” Welch said. “Officers can use this information to decide where to send surveillance drones or patrol vessels, and it can also be used to focus port inspections on vessels that have entered or near EEZ borders. AIS has been disabled in the transshipment hotspot.”

In addition to Welch and Clavel, co-authors of the paper include Timothy White, Jennifer van Osdale, Timothy Hochberg and David Crudsma at Global Fishing Watch; Megan Cimino, an assistant researcher at the Institute of Marine Sciences and an adjunct assistant professor of ocean science at UCSC; and Elliot Hazen, an assistant professor of ecology and evolutionary biology at UCSC.

more information:
Heather Welch, Hot Spots of Overlooked Fishing Ships, science advance (2022). DOI: 10.1126/sciadv.abq2109, www.science.org/doi/10.1126/sciadv.abq2109

Citation: Global analysis shows fishing vessels turn off their detection devices (2022, Nov 2) 2 Nov 2022 https://phys.org/news/2022-11-global-analysis-fishing- Retrieved from vessels-identification.html.

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