Abstract
Excluding the jellyfish from the bunt-end is a common slipping process used in the Sea of Marmara purse seine fishery. For this aim, a sheet of netting piece, larger mesh size and thicker diameter, is rigged on the bunt-end of the purse seine net. The jellyfish mass on the netting piece are slipped by rolling over the headline (floating line) after partially hauling or drying-up the net while it is still in the water. In this study, the catch amount of this slipping was roughly estimated with the introduction of the slipping process only used by the purse seiners in the Sea of Marmara. There were eight successful purse seine operations conducted between 8 and 11 September 2018 in depth ranged 77 to 677 m. The percentage of landed species versus to jellyfish varied between 23% and 85%. The mean landed anchovy amount is 4379 (3756.6) kg for per operation. The mean slipped amount of jellyfish is 3812.5 (2404.4) kg. However, both anchovy (99.8%) and jellyfish (96.3%) are the vast majority species that landed and slipped, respectively. In the operations totally 100 boxes of anchovy (1180 kg) unintentionally was slipped with the jellyfish. In addition, two sharks with larger size were slipped to the sea as alive over the floating line of the net. Although slipping practised rarely in Turkey, all the purse seiner in the Sea of Marmara have to use the adapted slipped process to get rid of jellyfish. However, there are no records and scientific findings regarding slipped amount of the jellyfish. For this reason, this study is important to presented preliminary results regarding amount of the jellyfish. In conclusion, this study is extended completely the Sea of Marmara practised to understand the dimensions of jellyfish amount and slipping process.
Highlights
Purse seining is energy efficient, environmentally friendly fish capture methodology generally targeting large and small pelagic fish shoals (Handegard et al, 2017) with sonar detection, light sources or Fish Aggregation Devices (FAD)
Excluding the jellyfish from the bunt-end is a common slipping process used in the Sea of Marmara purse seine fishery
Slipping practised rarely in Turkey, all the purse seiner in the Sea of Marmara have to use the adapted slipped process to get rid of jellyfish
Summary
Purse seining is energy efficient, environmentally friendly fish capture methodology generally targeting large and small pelagic fish shoals (Handegard et al, 2017) with sonar detection, light sources or Fish Aggregation Devices (FAD). Anchovy (Engraulis encrasicolus) is dominated fish species landed with 8340 tons It is followed by European pilchard (Sardina pilchardus) with 5685 tons, two kind of horse mackerels (Trachurus trachurus, T. mediterraneus) with 4447 tons, Atlantic bonito (Sarda sarda) with 1103 tons, bluefish (Pomatomus saltatrix) with 720 tons, mackerel (Scomber scombrus) with 287 tons, grey mullet species with 239 tons, chub mackerel (Scomber japonicus) with 147 tons and garfish (Belone belone) with 93 tons. Almost all of these landed species are captured by the purse seiners
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