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Istilaci balik turleri hem yerel balik turleri hem de akuatik habitatlar icin onemli bir tehdit olusturmaktadir. Yapilan arazi calismalari sirasinda Ordu ilinde ilk kez Ulugol’de istilaci bir balik turu olan Pseudorasbora parva’ya rastlanmistir. Arazi calismalarinda farkli boy gruplarina ait 41 adet P. parva bireyleri yakalanmistir. Turkiye ic sularinda yayilis alanini devamli olarak artiran bu istilaci turun total boy (TB), catal boy (CB), standart boy (SB) ve agirliklari (W) kayit altina alinmistir. P. parva bireylerinin ortalama TB, CB, SB and W degerleri sirasiyla 7,24±1,2 cm (3,8-9,4 cm), 6,52±1.1 cm (3,4-8,4 cm), 5,73±0,9 cm (3,0-7,1 cm) ve 3,24±1,4 g (0,4415-6,8632 g) olarak belirlenmistir. P. parva turu Ordu'da (Orta Karadeniz Bolgesi) icin ilk kayit olarak rapor edilmistir. Ulugol’de P. parva bireylerinin sayilarinin artmasi Ordu balik biyocesitliligi icin cok buyuk bir tehdit olusturmaktadir.

Pseudorasbora parva (Temminck & Schlegel, 1846): A New Threat to Fish Biodiversity in Ordu Province (Middle Black Sea Region)