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    By-catch and monetary loss of pufferfish in Turkey, the Eastern Mediterranean
    (2018) Öndes, Fikret; Ünal, Vahdet; Özbilgin, Yeliz; Deval, Cengiz; Turan, Cemal
    Non-native pufferfish have been a part of the Mediterranean marine ecosystem since the 1930s. However, there is a lack of knowledge regarding the by-catch of these species. This study aimed to compare the by-catch of pufferfish species between different types of fishing gear and to determine the monetary losses due to pufferfish on the Aegean (west) and Mediterranean (south) coasts of Turkey. A total of 467 commercial and recreational fishers (n= 244 and n=223 respectively), based in the 7 coastal cities were interviewed in the period of June - December 2017. A semi-structured questionnaire provided detailed information on by-catch amount of pufferfish in fishing gears, and economic loss caused by pufferfish. The most commonly caught pufferfish species was Lagocephalus sceleratus. The by-catch amount of pufferfish is higher on the Mediterranean coast in comparison with the Aegean coast. The highest pufferfish by-catch was recorded in purse seines and trawls on the south coasts, but in set nets on the west coasts. When seasonal changes were considered, the highest by-catch was occurred in the summer months for both commercial and recreational fisheries. Regarding the damages caused by pufferfish species in the small-scale fisheries, 92% and 90% of fishers, who fished on the south coasts, claimed that pufferfish species damage their fishing gears and fish entangled to these fishing gears, respectively. In conclusion, pufferfish species (e.g. L. sceleratus) are part of the ecosystem with their unknown quantified impacts. In fact, such information is required for fisheries management to mitigate the impacts of these species. The present study contributes to filling the gaps in this area.
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    By-catch and monetary loss of pufferfish in Turkey, the Eastern Mediterranean
    (Ege Univ, Fac Fisheries, 2018) Ondes, Fikret; Unal, Vandet; Ozbilgin, Yeliz; Deval, Cengiz; Turan, Cemal
    Non-native pufferfish have been a part of the Mediterranean marine ecosystem since the 1930s. However, there is a lack of knowledge regarding the by-catch of these species. This study aimed to compare the by-catch of pufferfish species between different types of fishing gear and to determine the monetary losses due to pufferfish on the Aegean (west) and Mediterranean (south) coasts of Turkey. A total of 467 commercial and recreational fishers (n= 244 and n=223 respectively), based in the 7 coastal cities were interviewed in the period of June - December 2017. A semi-structured questionnaire provided detailed information on by-catch amount of pufferfish in fishing gears, and economic loss caused by pufferfish. The most commonly caught pufferfish species was Lagocephalus sceleratus. The by-catch amount of pufferfish is higher on the Mediterranean coast in comparison with the Aegean coast. The highest pufferfish by-catch was recorded in purse seines and trawls on the south coasts, but in set nets on the west coasts. When seasonal changes were considered, the highest by-catch was occurred in the summer months for both commercial and recreational fisheries. Regarding the damages caused by pufferfish species in the small-scale fisheries, 92% and 90% of fishers, who fished on the south coasts, claimed that pufferfish species damage their fishing gears and fish entangled to these fishing gears, respectively. In conclusion, pufferfish species (e.g. L. me/era:us) are part of the ecosystem with their unknown quantified impacts. In fact, such information is required for fisheries management to mitigate the impacts of these species. The present study contributes to filling the gaps in this area.
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    SILVER-CHEEKED TOADFISH, LAGOCEPHALUS SCELERATUS (ACTINOPTERYGII: TETRAODONTIFORMES: TETRAODONTIDAE), CAUSES A SUBSTANTIAL ECONOMIC LOSSES IN THE TURKISH MEDITERRANEAN COAST: A CALL FOR DECISION MAKERS
    (Wydawnictwo Akad Rolniczej W Szczecinie, 2015) Unal, Vahdet; Goncuoglu, Huriye; Durgun, Denizcan; Tosunoglu, Zafer; Deval, Mehmet Cengiz; Turan, Cemal
    Background. While some Lessepsian species provide economic benefits for Mediterranean fisheries, others cause economic losses. Lagocephalus sceleratus known as silver-cheeked toadfish poses a great risk to human health if consumed economic losses for fishers by damaging their fishing gears. This study aims to determine the socio-economic impact of silver-cheeked toadfish, with regards to its impact on biodiversity and socio-economic factors for small-scale fisheries. Materials and methods. Face-to-face interviews were completed with a total of 261 fishers from Izmir in the Middle Aegean region to Hatay in the Eastern Mediterranean region, to determine the problems arising from the presence of silver-cheeked toadfish species in the ecosystem and the resulting associated economic losses for a 1-year from 1 January to 30 December 2011. The elements, which should be taken into account in calculating silver-cheeked toadfish related economic losses, are related to fishing gear, labour and the associated losses in catches. However, losses associated with silver-cheeked toadfish predation were beyond the scope of this study. Results. Almost all fishers (91%) agree that silver-cheeked toadfish is a major problem, 82% believe that silver -cheeked toadfish negatively affects biodiversity, and 89% believe it lowers efficiency of their catches. Calculated silver-cheeked toadfish related losses were: 1300 TRY**. (approximate to 442 EUR) per year, per fisherman; 263 296 TRY (approximate to 89 521 EUR) per year, in total, for the interviewed fi shers (261), and 204 fi shers suffered economic losses relating to this species; which caused total losses of 6 033 577 TRY (approximate to 2 051 416 EUR) per year in total for the 4719 fi shers, which were 78% of all fi shers (6051) in the study area. Two-thirds of the study respondents think that the most effective way to battle this problem would be to try to eliminate this species from Turkish waters. Among them, 32% of the fi shers believe the most suitable gear to eliminate L. sceleratus from the marine ecosystem is the purse seine and 61% consent to fish L. sceleratus for 4 TRY each as a target species. Conclusion. To start a bounty system and a premium payment for each pufferfish caught will both help to reduce negative impact of the species on the ecosystem and provide an extra income for the fishers.