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    The ichthyofaunal diversity of freshwater ecosystems in Gokceada Island (NW Turkey) under the pressure of nonnative species
    (Tubitak Scientific & Technological Research Council Turkey, 2021) Agdamar, Sevan; Sac, Gulsah; Gaygusuz, Ozcan; Dogac, Ersin; Acar, Umit; Gaygusuz, Cigdem Gursoy; Ozulug, Mufit
    Freshwater ecosystems have a greater value for biodiversity per surface area than terrestrial and marine ecosystems. Streams and lakes are notably prone to biodiversity loss, being the greatest threats habitat destructions and nonnative species. The aim of the present study is to assess the fish composition of lotic and lentic water systems of an island ecosystem (Gokceada Island, Turkey), which is poorly studied, and to highlight the entry routes and possible impacts of translocated fish species in an island ecosystem. The field surveys were conducted in a total of 14 sampling sites (five reservoirs and nine streams) in the inland waters of Gokceada Island between September 2019 and January 2021. Fish samples were collected by electrofishing (SAMUS 1000; a backpack electro-shocker). A total of eight fish species belonging to six families (Anguillidae, Atherinidae, Cyprinidae, Leuciscidae, Mugilidae, and Poeciliidae) were determined. As a result fish community of the island was mostly composed by the introduced species Carassius gibelio, Gambusia holbrooki and Pseudorasbora parva. This study provides the first detailed information on the distribution of the fish species encountered in the inland waters of Gokceada Island. Results showed that the fish fauna of the island was predominantly shaped by fish stocking activities.
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    Length-weight relationship of seven freshwater fish species from Turkish Thrace
    (Wiley, 2019) Sac, Gulsah; Gaygusuz, Ozcan; Gaygusuz, Cigdem Gursoy; Ozulug, Mufit
    The length-weight relationships (LWRs) of Alburnus istanbulensis Battalgil, 1941, Barbus tauricus Kessler, 1877, Cobitis pontica Vasil'eva & Vasil'ev, 2006, Cobitis strumicae Karaman, 1955, Gobio bulgaricus Drensky, 1926, Phoxinus strandjae Drensky, 1926 and Squalius orpheus Kottelat & Economidis, 2006 were analysed. Fish samples were collected by electroshocker (SAMUS 725 G and SAMUS 725 M portable electroshockers; frequency 50-55 Hz; 30-70 cm fishing depth) in some water bodies in Turkish Thrace from March 2012 to August 2017. The values of parameter b in the LWR equations varied from 2.916 (B. tauricus) to 3.336 (P. strandjae). This study also provides a new maximum length data for A. istanbulensis, G. bulgaricus, P. strandjae and S. orpheus.
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    New Distribution Areas of Four Invasive Freshwater Fish Species from Turkish Thrace
    (Central Fisheries Research Inst, 2019) Ozulug, Mufit; Gaygusuz, Ozcan; Gaygusuz, Cigdem Gursoy; Sac, Gulsah
    In order to be able to assess the impact of invasive fish on native species and ecosystems, it is important to know their existing distribution areas. The Meric River, which is fed by some other rivers from Greece and Bulgaria, is the 'open door' where invasive species enter Turkish inland waters through European part of Turkey. Due to this need, it was aimed to determine the new distribution areas of invasive C. gibelio, L. gibbosus, P. parva and G. holbrooki in Turkish Thrace. The field surveys were conducted in a total of 135 stations in Marmara and Meric-Ergene basins. Carassiusgibelio and G. holbrooki were the species that expanded their distribution range the most; C. gibelio was captured from 24 stations and it was recorded as new to 15 localities while G. holbrookiwas captured from 17 stations and it was recorded as new to 15 localities. Lepomisgibbosuswas collected from Rezve and Sultanbahce streams in Marmara Basin and it was recorded as new to these localities. Pseudorasboraparvawas collected from 10 stations and it was recorded as new to 9 localities.
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    A New Locality for the Freshwater Fish Chondrostoma angorense Elvira, 1987 (Osteichtyes: Cyprinidae) in the Marmara Region (Turkey)
    (Ege Univ, 2007) Tarkan, Ali Serhan; Ozulug, Mufit; Gaygusuz, Ozcan; Gaygusuz, Cigdem Gursoy
    In Lake Sapanca, C. nasus was reported in 1966. However, careful examination on this specimen in 1987 revealed that this species was Vimba vimba. In the present study, we report the finding of C. angorense from Lake Sapanca (Sakarya, Turkey) for the first time. The circumstances of identification and conservation status of the species are discussed.