Akın Türker İLKYAZ, Hasan Tuncay KINACIGİL, Gülnur METİN

The use of otolith length and weight measurements in age estimations of three Gobiidae species (Deltentosteus quadrimaculatus, Gobius niger, and Lesueurigobius friesii)

Üç kayabalığı türünün; dört benekli kayabalığı (Deltentosteus quadrimaculatus Valenciennes, 1837), kömürcü kayabalığı (Gobius niger Linnaeus, 1758) ve kayabalığı (Lesueurigobius friesii Malm, 1874), orta Ege Denizi’ndeki otolit boyu ve ağırlığının yaş tahmininde kullanımı araştırılmıştır. Toplamda; 266 adet dört benekli kayabalığı, 283 adet kömürcü kayabalığı ve 124 adet kayabalığı otoliti analiz edilmiştir. Balık yaşı - otolit boyu ve balık yaşı - otolit ağırlığı arasındaki matematiksel ilişki tespit edilmiş, ayrıca buna ek olarak total boy - otolit boyu ve total boy - otolit ağırlığı arasındaki ilişkiler de belirlenmiştir. Balık yaşı - otolith ağırlığı arasındaki ilişkilerin çalışılan türlerin yaş tahmini için en uygun eşitlik olduğu görülmüştür. Dört benekli kayabalığı, kömürcü kayabalığı ve kayabalığı için bu eşitlikler sırası ile t = 0,338W − 0,199, t = 0,147W − 0,085 ve t = 0,400W − 0,619 olarak tespit edilmiştir. Ayrıca bu çalışma, otolitten tür tayinine yardımcı olması için türlere ait otolit çizimlerini de içermektedir. Bu çalışmada sunulan bulgular sadece yaş tahmininde değil, ayrıca balıkla beslenen canlıların avladığı türlerin ve avın boyunun tahmini için de kullanılabilir.

Üç Gobiidae türünün otolit boyu ve ağırlığının yaş tahmininde kullanımı (Deltentosteus quadrimaculatus, Gobius niger ve Lesueurigobius friesii)

Age estimations were made using otolith length and weight measurements from 3 goby species in the central Aegean Sea: the four-spotted goby (Deltentosteus quadrimaculatus Valenciennes, 1837), the black goby (Gobius niger Linnaeus, 1758), and Fries’s goby (Lesueurigobius friesii Malm, 1874). A total of 266 individual four-spotted gobies, 283 black gobies, and 124 Fries’s gobies provided otolith samples for analysis. The relationships between fish age and otolith length and fish age and otolith weight were determined, as were the relationships between total length and otolith length and total length and otolith weight. Results indicated that the relationship between fish age and otolith weight was the most suitable for estimating the age of the studied species. The relationships were estimated at t = 0.338W − 0.199 for the four-spotted goby, t = 0.147W − 0.085 for the black goby, and t = 0.400W − 0.619 for Fries’s goby. The present paper also provides drawings of the species’ otoliths to aid in the identification of the species. This research provides information that can be applied not only for age estimation but also for prey identifi cation and estimation of the size of prey ingested by piscivorous predators.

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