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    Modeling the spatial distribution of the ctenophore Mnemiopsis leidyi A. Agassiz, 1865 in the Black Sea using a fuzzy rule-based system
    (Inst Oceanografiju I Ribarstvo, 2022) Poorbagher, Hadi; Birinci-Ozdemir, Zekiye; Eagderi, Soheil; Cicek, Erdogan
    Species distribution models can predict species occurrences in areas where no data is available by finding relationships between occurrences and environmental parameters. In this study, we applied a fuzzy rule-based system to model the spatial distribution of Mnemiopsis leidyi in the Black Sea and predict the probability of its presence throughout the sea. Six variables were used as predictors, including water turbidity, organic and inorganic particulate carbon, photosynthetically active radiation, light absorption by phytoplankton, sea surface temperature, and chlorophyll-a concentration. The results revealed a 0.807 accuracy of the model based on the confusion matrix. The results also showed that photosynthetically active radiation and sea surface temperature were the most important predictors shaping the distribution of this species. The findings also showed that the northern Black Sea was with the highest probability of presence, especially in Ukraine and Russia's coastal areas. In the coastal areas of Turkey, the highest presence probability was found near Rize, Trabzon, Ordu, and from Sinop to Zonguldak. Therefore, continuous monitoring of the Turkish coastal area is crucial to better understanding the effects of climate change and anthropogenic influences on the further distribution patterns of this invasive ctenophore in the southeastern Black Sea.
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    Preliminary study of A Bycatch of pelagic trawl fishery in the southern Black Sea Coast of Turkey: Moon jellyfish Aurelia aurita
    (Natl Inst Science Communication-Niscair, 2014) Ozdemir, Suleyman; Erdem, Ercan; Birinci-Ozdemir, Zekiye
    Present study was carried out in Southern Black Seaduring October 2008 and total 22 midwater trawl nets were towed.Horse mackerel (Trachurusmediterraneus) and moon jellyfish (Aurelia aurita)were caught by midwater trawl12 768 kg and 6415 kg respectively in the experiments. There are significant differences onthe mean length of horse mackerel in the hauls (p<0.05).Deadjellyfishcan increase the riskof pollutionin the Black Sea which is incidentalcaptured by the nets.