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DOI :10.26650/B/LS32.2023.003.09   IUP :10.26650/B/LS32.2023.003.09    Full Text (PDF)

Effects of Mucilage on the Fisheries in the Sea of Marmara

Firdes Saadet KarakulakAbdullah Ekrem KahramanUğur UzerBenal GülSadettin Doğu

In this study, a face-to-face survey was conducted with fishermen between January and May 2022 in order to determine the effects of the mucilage event on fishing activities in the eastern part of the Sea of Marmara. The event started to be seen in the Sea of Marmara in autumn 2020, and its effects gradually increased. A total of 226 fishermen (189 small-scale and 37 industrial) operating in Istanbul and Kocaeli were interviewed. The first noticeable signs of mucilage in the Sea of Marmara were observed by small-scale fishermen using gillnets. These fishermen reported that they started to notice the recent mucilage outbreak for the first time in October 2020. The density of this formation increased day by day, and its effect continued until July 2021. Throughout this process, the fishing efforts decreased, and the fishing gear and various boat equipment were adversely affected . According to our findings, the loss in catch efficiency varied between 50%-80% for small-scale fishermen and between 50%-100% for purse seine fishermen. On the other hand, the economic losses during this period were calculated as 5,000-80,000 Turkish Lira (TL) per boat for fishermen using line and gillnets, 100,000-300,000 TL per boat for beach seine and beam trawl fishermen, and between 300,000-4,000,000 TL per boat for purse seine fishermen. The rate of change in catch area was found to be very low (3%) for small-scale fishermen, while 44% of purse seine fishermen tried to compensate for their economic losses by changing their fishing areas and moving to areas in the Aegean or Black Sea. In addition, 56% of purse seine fishermen were determined to have finished their season early by withdrawing from fishing in February-March 2021, when the mucilage density gradually increased.



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