Karadeniz’de İstavrit (Trachurus mediterraneus Steindachner, 1868) Balığı Otolitlerinin Yaş, Bazı Halka Karakterleri ve Morfometrik Analizleri

Öz

Bu çalışmada Karadeniz için önemli bir tür olan istavrit (Trachurus mediterraneus) balığında farklı yaşlara sahip (0-5 yaş) otolitlere örnekler verilerek, türün otolit morfolojisi ve bazı halka yapısı özellikleri irdelenmiştir. Ordu-Rize arası ticari avcılığın yoğun olarak yapıldığı bölgelerden elde edilen örneklerden sağlanan 4265 adet otolit üzerinde çalışma gerçekleştirilmiştir. Otolitlerde şekil analizleri yapılarak F_F, R_D, A_R değerleri hesaplanmıştır. Morfolojik özelliklerine göre 4 farklı otolit tipi kaydedilmiştir. Nispeten yorumlanması güç bir otolit yapısına sahip olan istavrit de yaş tahmini çalışmalarında dikkat edilmesi gereken yalancı halka, larval dönem halkaları ve benzer oluşumlar belirlenmiştir. Bunun yanı sıra farklı tipte otolitler ve yapısal bozukluk gösteren bazı otolitler fotoğraflarla sunulmuştur.

Anahtar Kelimeler

• İstavrit,otolit,Trachurus mediterraneus,Karadeniz

Age and Some Ring Characteristics and Morphometric Analyses of Mediterranean Horse Mackerel’s Otoliths (Trachurus mediterraneus Steindachner, 1868) in The Black Sea

Abstract

Anahtar Kelimeler: İstavrit, otolit, Trachurus mediterraneus, Karadeniz

 

Mediterranean Horse Mackerel (Trachurus mediterraneus), one of the important species for Black Sea, was investigated in order to illustrate different aged otoliths’ (0-5) morphology and some ring characters. This research was carried out with 4265 otoliths which were sampled from the regions have an intensive commercial fishing between Ordu and Rize. It was conducted otolith shape analyses F_F, R_D, A_R. Four different otolith types according to their morphological features were fixed. Mediterranean Horse Mackerel has a complicated otolith structure that is relatively difficult to interpret the age, for this reason false ring, larval stage rings and similar formations were considered. Besides, different type of otoliths and some structural defected ones were presented with photographs.

 

Keywords

• Mediterranean horse mackerel,otolith,Trachurus mediterraneus,Black Sea

Kaynakça

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