Density and Biomass of Fish Populations in Kirmir Stream of Sakarya River, Turkey

Bu çalışmada, İç Anadolu Bölgesi'ndeki Sakarya Nehri'nin Kirmir Çayı'nda balık türlerinin yoğunluk ve biyomasdeğerlerini tahmin etmek için üç avlı ayrılmaya dayalı metot kullanılmıştır. 1.5256 ha'lık alanda örnekleme yapılmış ve Şubat 2007-Kasım 2007 tarihleri arasında 4167 adet balık elektroşok metoduyla avlanmıştır. Elde edilen örneklemelerde2 familyaya (Cyprinidae ve Cobitidae) ait 9 balık türü (tatlısu kefali (Leuciscus cephalus Linnaeus, 1758), bıyıklıbalık (Barbus plebejus escherichi Heckel, 1843), siraz balığı (Capoeta tinca Heckel, 1843), inci balığı (Alburnoidesbipunctatus Bloch, 1782), saçaklı siraz (Capoeta capoeta sieboldi Steindachner, 1864), karaburun (Chondrostomaregium Heckel, 1843), anadolu inci balığı (Alburnus orontis Sauvage, 1882), taş ısıran balığı (Cobitis taenia Linnaeus,1758) ve çöpcü balığı (Nemachelius angorae Steindachner, 1897) avlanmıştır. A. orontis toplam populasyon içerisinde1199 birey ve % 28.77 ile en yoğun türdür ve bu türü sırasıyla C. tinca (1173 birey ve % 28.15), B. p. escherichi (584birey ve % 14.01), L. cephalus (454 birey ve % 10.90), A. bipunctatus (322 birey ve % 7.73), C. regium (245 birey ve % 5.88), N. angorae (107 birey ve % 2.57) C. c. sieboldi (65 birey ve % 1.56) and C. taenia (18 birey ve % 0.43) takip etmiştir. Yoğunluk ve biyomas değerleri sırasıyla Şubat 2007'de; 11456 adet ha-1 ve 346.78 kg ha-1, Mayıs 2007'de; 8982 adet ha-1 ve 279.82 kg ha-1, Ağustos 2007'de; 6320 adet ha-1 ve 251.52 kg ha-1 ve Kasım 2007'de; 2887 adet ha-1 ve 168.87 kg ha-1 olarak tahmin edilmiştir. En düşük yoğunluk ve biyomas değerleri Kasım 2007'de gözlenmiştir.

Sakarya Nehri'nin Kirmir Çayı'ndaki Balık Populasyonlarının Yoğunluğu ve Biyoması

In this study, Zippin's triple-catch removal method was used to estimate density and biomass of fish species in Kirmir Stream of Sakarya River, Central Anatolia Turkey. A total area of 1.5256 ha was sampled and 4167 fishes were caught using electrofishing between February 2007 and November 2007. A total of 9 fish species representing 2 families Cyprinidae and Cobitidae were recorded. Fish species identified are as follows: Chub (Leuciscus cephalus Linnaeus, 1758), barbel (Barbus plebelejus escherichi Heckel, 1843), Capoeta tinca Heckel, 1843, spirlin (Alburnoides bipunctatus Bloch, 1782), Capoeta capoeta sieboldi Steindachner, 1864, tirgis-nase (Chondrostoma regium Heckel, 1843), bleak (Alburnus orontis Sauvage, 1882), spined-loach (Cobitis taenia Linnaeus, 1758) and angora-loach (Noemacheilus angorae Steindachner, 1897). A. orontis was the most dominant species, constituting 1199 fish and 28.77% of the total fishes, followed by C. tinca (1173 fish and 28.15%), B. p. escherichi (584 fish and 14.01%), L. cephalus (454 fish and 10.90%), A. bipunctatus (322 fish and 7.73%), C. regium (245 fish and 5.88 %), N. angorae (107 fish and 2.57%) C. c. sieboldi (65 fish and 1.56%) and C. taenia (18 fish and 0.43%). The density and biomass values were estimated as 11456 fish ha-1 and 346.78 kg ha-1 in February 2007, 8982 fish ha-1 and279.82 kg ha-1 in May 2007, 6320 fish ha-1 and 251.52 kg ha-1 in August 2007 and 2887 fish ha-1 and 168.87 kg ha-1 in November 2007, respectively. The lowest density and biomass values were observed in November 2007.

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