The primary reasons for fishing gear becoming marine debris are categorised internationally into three main fractions: Abandoned, lost, or discarded fishing gear (ALDFG). In the Nordic context, it is unlikely that a significant number of fishers deliberately abandon their gear, although isolated cases of such behaviour can happen. Historically, it was common practice among the Nordic countries to discard used fishing gear at sea rather than bringing damaged or unusable gear back to land. However, this practice is now believed to be rare, as waste management systems onshore have improved significantly. Additionally, fishers are increasingly aware of the problems that discarded fishing gear can cause in the long term. However, fishing gear continues to be lost in Nordic fisheries, as in fisheries worldwide (Richardson et al., 2022). This typically involves parts of gear, such as sections of trawl nets or fragments of gillnets, rather than complete gear. However, there are instances where entire fishing gear such as longlines or sets of traps are lost due to strong currents, drifting ice, or other environmental factors.
Norway stands out for its systematic approach to documenting lost fishing gear. Fishers in Norway can report lost gear, including its location, cause, and quantity, without facing repercussions. It is relatively simple for commercial fishers to register the loss of fishing gear using an interactive website, while recreational fishers can use a mobile app for the same. Although the exact proportion of Norwegian fishers reporting such losses remains unknown, the low number of unreported findings (without the towing wire) suggests high compliance with the reporting requirement. Regular annual retrieval efforts are believed to be key in maintaining this compliance. This documentation enables regular retrieval missions using large vessels to clear areas where lost fishing gear is known to be located or even accumulating, a practice that Norway has sustained for more than 40 years (Vodopia et al., 2024). In contrast, other Nordic countries lack comprehensive systems for recording lost fishing gear. As a result, retrieval missions are infrequent or non-existent, allowing fishing gear to accumulate on the seabed. The loss of smaller components of fishing gear, such as snood lines from longlines, dolly rope threads from trawl codends, and fragments of gillnets, are frequently lost during fishing activities. Additionally, trimming and maintaining gear can also contribute to these losses. Although measuring the quantity of such losses is challenging, some isolated studies have attempted to quantify them. These more minor losses, though less noticeable, can have significant environmental impacts (Kammann et.al., 2023; Richardson et.al., 2022).
A particularly striking example involves nesting sites of the Northern gannet (Morus bassanus). These birds often use fragments of fishing gear, particularly dolly ropes, in their nests. These materials, originating from bottom trawling operations domestically or internationally, entangle adult birds and chicks, often causing them to hang or starve to death (O’Hanlon et al., 2019; Massetti et.al., 2021).
The fishing industry should prioritise developing more sustainable materials for gear components known to harm the environment, even when lost in small quantities. Efforts to address this issue could include research into alternative materials, improved maintenance practices, and increased accountability for gear use and disposal.