Some Biological Characteristics of the Transcaucasian spirlin, Alburnoides fasciatus (Nordmann, 1840) inhabiting Borçka Reservoir, NE Türkiye

Yıl 2022, Cilt: 7 Sayı: 4, 582 - 588, 31.12.2022

Tuncay Yeşilçiçek

https://doi.org/10.35229/jaes.1208596

Öz

The present study investigates for the first time some basic biological aspects such as sex ratio, size composition, length-length relationships (LLRs) and length-weight relationships (LWRs) of Alburnoides fasciatus inhabiting Borçka Dam Lake and its tributaries from the lower Çoruh River Basin located in the northeastern Türkiye. Fish samples were collected from February 2017 to June 2019. Totally 171 specimens ranging from 7.4 cm to 16.2 cm TL and 4.06 g to 46.56 g were sampled. The sex ratio (F:M) was calculated as 1.19:1.00 (χ2 test; P>0.05). The total length-weight relationships were determined as W= 0.008TL3.154 (r2=0.987, N=93) for females, as W= 0.007TL3.183 (r2=0.990, N=78) for males and as W= 0.007TL3.205 (r2=0.981, N=171) for combined sex. The b-values were significantly different from isometric growth (b=3) indicating positive allometric growth of Transcaucasian spirlin for all sexes (Pauly’s t-test; P˂0.05). The regression analysis of LWRs revealed that the coefficient of determination was r2>0.9 showing a highly significant correlation between total length and weight. Results of the LLRs indicated that the values of correlation coefficient were highly correlated (r2>0.9) for each sex and relationship. The differences in b values of the LWR were statistically significant for both sexes (ANCOVA; P<0.05). The present study also reports a new maximum total length and weight data as 16.2 cm and 46.56 g for this species. This study will provide a baseline on some basic biological parameters of Transcaucasian spirlin for the fisheries management authority and fisheries scientists for further investigations as well as presents the first known reference on the LLRs and size structure of this species for the FishBase database. Furthermore, the reported results may contribute to the conservation and sustainability of this species in the area as well.

Anahtar Kelimeler

Alburnoides fasciatus, Borçka dam lake, growth pattern, LLRs and LWRs, sex ratio

Teşekkür

The author would like to thank Dr. Cüneyt Kaya, and M.Sc. Yunus Dedeoğlu, also D. Ali Öztürk for their valuable helps in field samplings.

Borçka Baraj Gölü'nde (KD Türkiye) Yaşayan Kafkas Noktalı İnci Balığı, Alburnoides fasciatus (Nordmann, 1840) 'nın Bazı Biyolojik Özellikleri

Öz

Bu çalışma, kuzeydoğu Türkiye'de yer alan aşağı Çoruh Nehri Havzası'ndaki Borçka Baraj Gölü ve kollarında yaşayan Alburnoides fasciatus'un cinsiyet oranı, boy kompozisyonu, boy-boy ilişkileri (LLRler) ve boy-ağırlık ilişkileri (LWRler) gibi bazı temel biyolojik yönlerini ilk kez araştırmaktadır. Balık örnekleri Şubat 2017 - Haziran 2019 tarihleri arasında toplanmıştır. 7,4 cm ile 16,2 cm TL ve 4,06 g ile 46,56 g arasında değişen toplam 171 örnek alınmıştır. Cinsiyet oranı (D:E) 1,19:1,00 olarak hesaplanmıştır (χ2 test; P>0.05). Toplam boy-ağırlık ilişkileri dişilerde W=0,008TL3,154 (r2=0,987, N=93), erkeklerde W=0,007TL3,183 (r2=0,990, N=78) ve tüm bireyler için W=0,007TL3,205 (r2=0,981, N=171) olarak belirlenmiştir. b-değerleri, izometrik büyümeden (b=3) önemli ölçüde farklıydı ve tüm cinsiyetler için Kafkas Noktalı İnci balığı pozitif allometrik büyüme göstermiştir (Pauly’s t-testi; P˂0.05). LWR'lerin regresyon analizi, r2>0,9 olduğunu ortaya koymuş ve toplam boy ve ağırlık arasında oldukça önemli bir korelasyon olduğunu göstermiştir. LLR'lerin sonuçları, her bir cinsiyet ve ilişki için korelasyon katsayısı değerlerinin yüksek düzeyde ilişkili olduğunu (r2>0,9) göstermiştir. LWR'nin b değerlerindeki farklılıklar her iki cinsiyet için de istatistiksel olarak anlamlı bulunmuştur (ANCOVA; P<0.05). Bu çalışma ayrıca bu tür için 16,2 cm ve 46,56 g olarak yeni bir maksimum toplam boy ve ağırlık verisi bildirmektedir. Bu çalışma, Kafkas Noktalı İnci Balığı’nın bazı temel biyolojik parametreleri hakkında balıkçılık yönetimi otoritesi ve balıkçılık bilim adamlarına ileri araştırmalar için bir temel sağlamanın yanı sıra FishBase veri tabanı için bu türün LLR'leri ve boy kompozisyonu hakkında bilinen ilk referansı sunacaktır. Böylelikle, rapor edilen sonuçlar bu türün bölgede korunmasına ve sürdürülebilirliğine de katkıda sağlayacaktır.

Anahtar Kelimeler

Alburnoides fasciatus, Borçka Baraj Gölü, büyüme şekli, cinsiyet oranı, LLRler ve LWRler.

Kaynakça

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