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

Year 2019, Volume: 15 Issue: 4, 507 - 516, 16.12.2019

Melek Özpiçak , Semra Saygın , Nazmi Polat

https://doi.org/10.22392/actaquatr.559899

Cited By: 3

Abstract

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

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

Abstract

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). 

Keywords

Lüfer, Pomatomus saltatrix, otolit, şekil indeksleri

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