Life-history aspects of Caspian shemaya alburnus chalcoides in two south Caspian Rivers (Siahroud and Gorganroud)

Siahroud’da (Güney Hazar Havzasının Merkezi) ve Gorganroud’da (Güney Hazar Havzasının Batısı) Şubat 2007’den Ağustos 2007’e kadar olan üreme döneminde yakalanan Alburnus chalcoides balıkları yaşam özellikleri bakımından incelenmiştir. Siahroud nehrinin erkek balıklar için negatif allometrik ve Gorganroud nehrinin erkek ve dişileri ile Siahroud nehrinin dişileri için pozitif allometrik olmak üzere balıkların 5 yıllık bir yaşam döngüsü vardı. Von Bertalanfy büyüme fonksiyonları Siahroud’da erkekler için $L _t$=370,08(1-$e^ {-0,15(t+0,70)}$) ve dişiler için $L _t$=432,52(1-e-0,11(t+1,21)), Gorganroud’daki erkekler için $L _t$=371,79(1-$e^ {-0,14(t+0.96)}$) ve dişiler için $L _t$=436,10(1-$e^ {-0,11(t+1.21)}$) bulunmuştur. Genel cinsiyet oranı dişilerin lehinedir. Tatlı su kolyozunun üremesi Siahroud nehrinde Nisan-Temmuz arasında, Gorganroud nehrinde ise Mart-Haziran arasında gerçekleşmekte ve her iki nehirde de Mayıs ayında pik yapmaktadır. Mutlak fekondite, Siahroud nehrinde 1.674– 38.340 arasında değişmekle birlikte ortalama 8,426.25 yumurta iken, Gorganroud nehrinde 623–17.263 arasında değişme göstermekte ve ortalama 4.214,70 yumurta olarak bulunmuştur. Relatif fekondite ise Siahroud nehrinde 23,28–598,86 yumurta/g arasında değişerek vücut ağırlığının ortalama 211,68 yumurta/g olurken Gorganroud nehrinde 12,11-696,38 yumurta/g arasında değişerek vücut ağırlığının ortalama 111,60 yumurta/g olarak hesaplanmıştır. Ortalama yumurta çapı Siahroud’da 1,40±0,14mm, Gorganroud’da 1,27±0,27 mm olarak ölçülmüştür. Elde edilen sonuçlara göre, tatlısu kolyozunun yaşam özelliklerine ait durumlar nehirler arasında önemli derece farklı bulunmuştur. Farklılıkların habitat özelliklerinden kaynaklanmış olduğu düşünülmüştür.

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Turkish Journal of Fisheries and Aquatic Sciences-Cover
  • ISSN: 1303-2712
  • Başlangıç: 2015
  • Yayıncı: Su Ürünleri Merkez Araştırma Enstitüsü - Trabzon
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