Browsing Avesis by Author "Demirel, Nazlı"
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A comparison of market landings during fish spawning seasons to better understand the effectiveness of the temporal fishery closure in Turkey
Demirel, Nazlı; Yıldız, Taner; Ulman, Aylin (2020)Seasonal fishery closures are an input control measure to reduce fishing pressure on spawning stocks in fisheries management. Despite the huge foregone economic losses from such closures, the efficacy of them has yet ... -
A new approach for estimating stock status from length frequency data
Tsikliras, Athanassios C.; Dimarchopoulou, Donna; Scarcella, Giuseppe; Probst, Wolfgang Nikolaus; Dureuil, Manuel; Pauly, Daniel; Demirel, Nazlı; Froese, Rainer; Winker, Henning; Coro, GianpaoloThis study presents a new method (LBB) for the analysis of length frequency data from commercial catches. LBB works for species that grow throughout their lives, such as most commercially-important fish and invertebrates, ... -
First Large-Scale Eastern Mediterranean and Black Sea Stock Assessment Reveals a Dramatic Decline
Zengin, Mustafa; Demirel, Nazlı; Ulman, AylinThe Mediterranean Sea is classified as a “data-poor” region in fisheries due to its low number of assessed stocks given its biodiversity and number of exploited species. In this study, the CMSY method was applied to assess ... -
Oil Spill Along the Turkish Straits Sea Area; Accidents, Environmental Pollution, Socio-economic Impacts and Protection
Öz, Melike Idil; Demirel, Nazlı -
Seasonal distribution of Trachurus mediterraneus (Steindachner, 1868) in the Golden Horn Estuary, Istanbul
Yuksek, Ahsen; Demirel, NazlıSeasonal changes in the distribution of an important commercial and recreational fish species, Trachurus mediterraneus (Steindachner, 1868), from the family Carangidae were investigated in the Golden Horn Estuary of Istanbul. ... -
Spawning Frequency of Trachurus mediterraneus (Carangidae) in The Sea of Marmara
Yuksek, Ahsen; Demirel, NazlıIn this study the spawning frequency of Trachurus mediterraneus was estimated for the first time in the Mediterranean basin. The presence of the late-migratory nucleus stage oocytes and post ovulatory follicles (POFs) in ... -
Stock dynamics and predator-prey effects of bonito and bluefish as top predators in the Black Sea
Daskalov, Georgi; Zengin, Mustafa; Ulman, Ayiln; Georgieva, Yoana; Demirel, Nazlı (2020)This study uses surplus production model based methods for data-poor stocks (BSM and CMSY) to assess the stocks and estimate key reference points of bonito and bluefish in the Black Sea. Our results demonstrate that the ... -
Stomach content of three batoid species in the Sea of Marmara of the North-eastern Mediterranean
Gül, Güzin; Demirel, Nazlı (2020)The feeding habits and trophic levels of three uncommon batoid species (Dasyatis pastinaca, Myliobatis aquila, Torpedo marmorata) were investigated in the Sea of Marmara, with two different methodical approaches: stomach ... -
The lost fish of Turkey: A recent history of disappeared species and commercial fishery extinctions for the Turkish Marmara and Black Seas
Ulman, Aylin; Pauly, Daniel; Demirel, Nazlı; Zengin, Mustafa (2020)A timeline of commercial fisheries extinctions and a list of threatened or extirpated marine species are presented to document the rapidly declining abundance of marine resources in the Turkish part of the Black Sea and ... -
Weight-length relationships of 28 fish species in the Sea of Marmara
Demirel, Nazlı; Murat Dalkara, ElifWeight-length relationships (WLRs) for 28 fish species were investigated in an enclosed basin in the Sea of Marmara. Due to low sample sizes ( 0.05). In this study, WLRs for Pomatoschistus marmoratus are presented for the ...