![]() ![]() AIS requirements are based on many factors, including vessel size, what country the vessel is flagged to, its location in the ocean and what species its crew is trying to catch.Ī ship that disables its AIS transponder disappears from the view of whomever may be watching, including authorities, scientists and other vessels. Often it’s unclear whether going dark in this way is legal. Just as thieves can turn off phone location tracking, ships can disable their AIS transponders, effectively hiding their activities from oversight. Surveillance there is aided by location transponders, called the Automatic Identification System, or AIS, which works like the Find My iPhone app. The high seas are the modern world’s Wild West – a vast expanse of water far from oversight and authority, where outlaws engage in illegal activities like unauthorized fishing and human trafficking. Better information about how often boats go dark at sea can help governments figure out where and when these activities may be taking place.Ĭountries can combat illegal, unreported and unauthorized fishing by checking paperwork, verifying catches and sharing information across borders. It also has been linked to human rights violations, such as forced labor and human trafficking. Illegal fishing causes economic losses estimated at $US10 billion to $25 billion annually. And authorities like the International Maritime Organization can use this missing data to help combat illegal activities at sea, such as overfishing and exploiting workers on fishing boats. In a recent study, I worked with colleagues at Global Fishing Watch, a nonprofit that works to advance ocean governance by increasing transparency of human activity at sea, to show that these periods of missing transponder data actually contain useful information on where ships go and what they do. For the 19 hours when the ship was dark, no information was available about where it had gone or what it did. 11, the Oyang 77 turned its transponder back on and reappeared on the high seas. ![]() 10, the Oyang 77 turned off its location transponder at the edge of Argentina’s exclusive economic zone – a political boundary that divides Argentina’s national waters from international waters, or the high seas. The vessel had a known history of nefarious activities, including underreporting its catch and illegally dumping low-value fish to make room in its hold for more lucrative catch.Īt 2 a.m. ![]() So on those sunny days make sure you fish the shaded areas.In January 2019, the Korean-flagged fishing vessel Oyang 77 sailed south toward international waters off Argentina. What happens is the direct sunlight warms up the water temperature which brings the fish on the bite (especially in the afternoon) but they will 90% of the time only feed in the dark shadows. The brighter days also help Trout to pick up on flashy lures.Īlso during late autumn when the water is starting to get cooler we find the fish can bite better on a bright sunny day. Trout, unlike natives aren’t as spooky and will move around all day in high sun. ![]() Therefore during September when targeting Golden Perch we prefer the warm sunny days over the cloudy days.ĭuring the same time of year Trout will prefer the bright and warm days as this brings out the insect activity. At this time of year fishing is generally hard going and when we start to see some warm days the perch will start feeding usually in the afternoon as the water will be warming up. During the transition from winter to spring when targeting golden perch, overcast days can keep the fish from starting to feed. Overcast conditions aren’t always good news and sometimes it can go against us. When do overcast conditions work against us? ![]()
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