Aysun GÜMÜŞ, Ayşe VAN, Mustafa ZENGİN, Serdar SÜER

Güney Karadeniz kıyılarında dağılım gösteren üç küçük yem balığının otolit yapısı ve bazı ekolojik özelliklerine dair bilgiler

Bu çalışmada, üç küçük yem balığının mide içeriği çalışmalarına bilgi sağlamak için otolitlerinin tanımlanmasını ve bu türler hakkında halihazırda sınırlı olan biyolojik ve ekolojik bulgulara katkı sağlamak amaçlanmıştır. Hedef kompozisyonunda bol miktarda bulunan araştırma materyallerini toplamak için Kızılırmak-Yeşilırmak ve Melet Nehirleri şelf alanları boyunca mevsimsel deneysel dip trol surveyleri yürütülmüştür. Örneklemin, vücut boyutuna ait ölçümleri, bollukları, derinlik, mevsim ve lokalite bilgileri daha sonraki değerlendirmeler için kaydedilmiştir. Otolit şekilleri Aphia minuta için ‘diskoidal oval, Pomatoschistus marmoratus için ‘diskoidal’ ve Arnoglossus kessleri için ‘kare’ olarak tanımlanmıştır. Sığ kıyı suları boyunca (0-30 m) bol miktarda bulunan Aphia minuta türünün ortalama boy ve ağırlık değerleri, lokaliteler ve örneklendiği mevsimler arasında önemli ölçüde farklılık gösterirken, derinlikler arasında fark bulunmamıştır. Dağılımı derinlikler ile mevsimler arasında anlamlı farklılık gösteren Pomatoschistus marmoratus, 30-60 m derinlik aralığında yoğun bir dağılım göstermektedir. Arnoglossus kessleri en fazla 0-30 m derinlik aralığında yoğundur ve 60 m üzerinde ise örneğe rastlanmamıştır. Bu türün ortalama boy ve ağırlık değerleri sadece mevsimler arasında önemli ölçüde farklı ancak derinlikler ve lokaliteler arasında ise benzerdir.

Anahtar Kelimeler:

Aphia minuta, Pomatoschistus marmoratus, Arnoglossus kessleri, bolluk, Karadeniz

Evidence on Otolith Structure and some Ecological Features of Three Small Foraging Species along the Southern Black Sea Coast

In this study, we aimed to describe otoliths to provide information about the stomach contents of three small foraging species and to contribute to the currently limited biological and ecological evidence about the species. Seasonal experimental bottom trawl surveys were conducted along the shelf areas of the Kızılırmak-Yeşilırmak and Melet Rivers to collect investigation materials which were abundant in the bycatch composition of the target catch. The information about body size measurements, abundance values, depth, season, and locality of samplings was recorded for further evaluations. Otolith shapes were defined as discoidal to ovate for the Aphia minuta, discoidal for the Pomatoschistus marmoratus, and square for the Arnoglossus kessleri. The mean length and weight values of the Aphia minuta, which was abundant along shallow coastal waters (0-30 m), were significantly different between localities and sampling season, but no difference was found between depth ranges. Pomatoschistus marmoratus, whose distribution varied significantly between depths and seasons had dense distributions along with the depth range of 30-60 m. Arnoglossus kessleri was most abundant along with the depth range of 0-30 m and had no samples in depths of over 60 m. It was found that the mean values of length and weight of this species were only significantly different among seasons but similar over the depth ranges and localities.

Keywords:

Aphia minuta, Pomatoschistus marmoratus, Arnoglossus kessleri, abundance, Black Sea.,

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