Investigating the Fluctuating Asymmetry in the Otolith Characters of Mediterranean Horse Mackerel, Trachurus mediterraneus (Steindachner 1868) Inhabiting Edremit Bay, North Aegean Sea

Year 2018, Volume: 8 Issue: 1, 69 - 78, 15.06.2018

Derya Bostancı , Dilek Türker Serdar Yedier Seda Kontaş Gülşah Kurucu

Abstract

The fluctuating asymmetry values of four
different otolith characters such as otolith size, width, area and perimeter of
Mediterranean horse mackerel, Trachurus
mediterraneus living in Edremit Bay, North Aegean Sea was investigated to
determine whether these species are under environmental stress in their
habitat. In this study, 180 fish samples captured by local fishermen and 360
sagittal otoliths collected from these samples were used. When left and right otolit characters such as length, width,
area and perimeter are examined, a statistical difference (P<0.05)
was found only in the otolith area between the left and right otolith pairs,
and this difference was reflected in the asymmetry of the otolith area. The
fish samples were divided into eight total size groups and the asymmetry of
each size group was evaluated separately and without total length groups.
Otolith area showed the highest asymmetry with 2.8425 value while otolith
perimeter had the lowest asymmetry with 1.5931 value. It was not found that the
fluctuating asymmetry of otolith characters studied in the current study was not correlated with sex of the fish (P>0.05).
When the fluctuating asymmetry of otolith characters in T. mediterraneus evaluates, the result is that the number of
asymmetric individuals is so high that they may be under stress in the living
environment

Keywords

Asymmetry, sagittal otolith, environmental stress, water pollution, Trachurus mediterraneus, North Aegean Sea

Kuzey Ege Denizi Edremit Körfezi'nde Yaşayan Sarı Kuyruk İstavrit, Trachurus mediterraneus (Steindachner 1868)'un Otolit karakterlerinde Dalgalı Asimetrinin İncelenmesi

Abstract

Kuzey Ege Denizi Edremit Körfezi'nde yaşayan Trachurus mediterraneus, sarı kuyruk istavritin otolit boyu,
genişliği, alanı ve çevresi gibi dört farklı otolit karakterinin dalgalı
asimetri değerleri inceleyerek bu türlerin yaşadığı habitatta çevresel kaynaklı
bir stres altında olup olmadığını belirlemek için yapılmıştır. Bu çalışmada
yerel balıkçılar yardımıyla yakalanan 180 adet balık örneği ve bu örneklerden
çıkarılmış toplamda 360 adet sagittal otolit kullanılmıştır. Sol ve sağ otolit
çiftlerinin boyu, genişliği, alanı ve çevresi gibi karakterleri incelendiğinde
bu karakterler arasında sadece otolit alanında istatistiki bir fark belirlenmiş
(P<0.05) olup bu farkta otolit alanının asimetrisine yansımıştır. Balık örnekleri
sekiz total boy grubuna bölünerek her boy grubunun asimetrisi hem ayrı ayrı
hesaplanmış hem de boy grubu olmaksızın değerlendirilmiştir. Otolit alanı
2.8425 değeriyle en fazla asimetri gösterirken otolit çevresi ise 1.5931
değeriyle en az asimetri gösteren karakterler olmuştur. Çalışmada incelenen
otolit karakterlerinin dalgalı asimetrisinin balıkların cinsiyetlerine göre
değişmediği bulunmamıştır (P>0.05). T.
mediterraneus’un otolit karakterlerinin dalgalı asimetrisi
değerlendirildiğinde asimetrik birey sayısının fazla olması nedeniyle yaşadığı
ortamda stres altında olabileceği sonucuna varılmıştır. 

Keywords

Asimetri, Sagittal otolit, Çevresel stres, Su kirliliği, Trachurus mediterraneus, Kuzey Ege Denizi

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