Melek ÖZPİÇAK, Semra SAYGIN, Nazmi POLAT

Karadeniz Bölgesi’nden Örneklenen Lüfer Balığının, Pomatomus saltatrix (Linnaeus, 1766) Otolit Şekil Analizi

Bu çalışmada Karadeniz Bölgesi’nin Samsun ili açıklarından örneklenmiş olan lüfer balığının Pomatomus saltatrix (Linnaeus, 1766) otolit şekil özellikleri ve otolit şeklinin otolit boyu ile olan ilişkileri araştırılmıştır. Ticari balıkçılardan iki ayrı avcılık sezonu içerisinde toplamda 166 (94♀ ve 72♂) adet örnek alınmıştır. Her bir örneğin sagittal otolitleri çıkarılmış ve analizlerde altı farklı şekil indeksi (şekil faktörü, yuvarlaklık, dairesellik, dikdörtgensellik, ovallik ve en-boy oranı) kullanılmıştır. Otolit şekil özellikleri ile otolit boyu arasındaki ilişkilerin hesaplanması için linear model tercih edilmiştir. İstatistiksel analizlerde paired t-testi, wilcoxon testi, independent t testi gibi testler kullanılmıştır. Yakalanan örneklerin minimum ve maksimum total boy ve ağırlıkları sırasıyla 13,50-24,80 cm ve 22,01-161,19 g arasında değişmektedir. Total boy ve ağırlık bakımından dişi ve erkek bireyler arasında fark yoktur. Dişi ve erkek bireylerin otolit ölçümleri otolit eni, boyu, çevre ve alanı bakımından karşılaştırıldığında herhangi bir farklılık olmadığı belirlenmiştir (P˃0,05). Fakat sağ-sol karşılaştırmalarında otolit eni ve çevresi bakımından farklılıklar saptanmıştır (P˂0,05). Ovallik parametresinin diğer beş parametreye göre otolit boyu ile çok daha kuvvetli bir ilişkiye sahip olduğu belirlenmiştir (r2˃0,590).

Anahtar Kelimeler:

Lüfer, Pomatomus saltatrix, otolit, şekil indeksleri

Otolith Shape Analysis of Bluefish, Pomatomus saltatrix (Linnaeus, 1766) in the Black Sea Region (Samsun, Turkey)

In this study, otolith shape indices and relationships between otolith shape and otolith length of the bluefish species Pomatomus saltatrix (Linnaeus, 1766), which was sampled from the Samsun offshore of the Blacksea Region were investigated. A total of 166 samples (94♀ and 72♂) were taken from commercial fishermen in two different fishing seasons. Sagittal otoliths of each sample were removed and six different shape index (form factor, roundness, circularity, rectengularity, ellipticity and aspect ratio) were used in analyses. The linear model is preferred for calculating the relationships between otolith shape properties and otolith length. Paired t-test, wilcoxon test, independent t test were used for statistical analysis. The minimum and maximum total lengths and weights of the captured samples are between 13.5-24.8 cm and 22.01-161.19 g, respectively. There is no difference between female and male in terms of total length and weight. When otolith dimensions of female and male were compared, there were no differences in terms of Otolith Length, Otolith Breadth, Otolith Perimeter and Otolith Area (P˃0.05). However, according to left and right otoliths comparisons, there were differences in terms of OB and OP (P˂0.05). Ellipticity was found to have a much stronger relationship with otolith length than the other five parameters (r2˃0.590).

Keywords:

Bluefish, Pomatomus saltatrix, Otolith, Shape indices,

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