Otolith Shape Analysis and Otolith Morphometry of Bogue Boops boops (Linnaeus, 1758) in the Aegean Sea and the Marmara Sea

Öz

In the present study, otolith shape indices and some otolith morphometric characteristics in the left and right sagittal otoliths were identified and compared for Boops boops in the Aegean Sea and the Marmara Sea. Otoliths of Boops boops from 244 individuals in the North of Aegean Sea and 188 individuals from the Southwest of Marmara Sea were analyzed during the 2024 fishing season. The total length-otolith dimensions relationships were evaluated, the best fit was obtained between total length and otolith perimeter in the Marmara Sea and Aegean Sea, while the least fit was obtained among total length and otolith area of right otoliths, total length and otolith length of left otoliths in the Aegean Sea and Marmara Sea. Some similarities of Boops boops stocks were found with shape indices and otolith morphometry between the Aegean Sea and Marmara Sea. The otolith area and circularity of the left otolith, roundness and rectangularity of the right otolith, form factor of left and right otolith were significantly different (p<0.05). Principle Component Analysis may explain these differences as arising from variations in the roundness, otolith area and otolith width. Also, Canonical Discriminant Analysis demonstrated significant discrimination of otoliths between the Aegean Sea and the Marmara Sea (p<0.05), and 56.6% of the originally grouped cases were correctly classified. Based on the results of this study, two stocks of Boops boops in the North of Aegean Sea and the Southwest of Marmara Sea might be different. Howewer, more detailed studies are required the determine whether this species constitues the same stock in these areas.

Anahtar Kelimeler

• Otolith shape indices
• Stock discrimination
• Çanakkale Strait
• Otolith dimensions
• Sagittal otolith

Ege Denizi ve Marmara Denizi'ndeki Kupez’in Boops boops (Linnaeus, 1758) Otolit Şekil Analizi ve Otolit Morfometrisi

Öz

Bu çalışmada, Ege Denizi ve Marmara Denizi'nde Boops boops'un otolit şekil indeksleri ile bazı otolit morfometrisi özellikleri sağ ve sol sagittal otolitlerinde tanımlanmış ve karşılaştırılmıştır. 2024 balıkçılık sezonunda Ege Denizi’nin kuzeyinden 244 birey ile Marmara Denizi’nin güneybatısından 188 bireyin otolitleri analiz edilmiştir. Toplam boy-otolit boyutları ilişkileri değerlendirildiğinde, Marmara Denizi ve Ege Denizi'nde toplam boy ile otolit çevresi arasında en iyi uyum sağlanırken, Marmara Denizi ve Ege Denizi'nde toplam boy ile sağ otolitlerin otolit alanı ile toplam boy ile sol otolitlerin otolit boyu arasında en düşük uyum sağlanmıştır. Boops boops stokları arasında Ege Denizi ve Marmara Denizi’nde otolit şekil indeksleri ve otolit morfometrisi açısından bazı benzerlikler bulunmuştur. Sol otolitin alanı ve daireselliği, sağ otolitin yuvarlaklığı ve dikdörtgenselliği, sol ve sağ otolitin form faktörü açısından anlamlı farklılıklar göstermiştir (p<0,05). Temel Bileşen Analizi, bu denizlerdeki farklılıkların yuvarlaklık, otolit alanı ve otolit genişliğinden kaynaklandığını açıklayabilir. Ayrıca, Kanonik Ayırım Analizi, Ege Denizi ile Marmara Denizi arasında otolitlerin anlamlı şekilde ayırt edilebildiğini (p<0,05) ve gruplandırılan örneklerin %56,6'sının doğru şekilde sınıflandırıldığını ortaya koymuştur. Bu çalışmanın sonuçlarına göre, Ege Denizi’nin kuzeyindeki ve Marmara Denizi’nin güneybatısındaki iki Boops boops stoğunun farklı olabileceği düşünülmektedir. Fakat bu türün, bu denizlerde aynı stok olup olmadığının incelenmesini içeren daha ayrıntılı çalışmalar gerekmektedir.

Anahtar Kelimeler

• otolit şekil indeksi
• Stok ayrımı
• Çanakkale Boğazı
• Otolit boyutları
• sagittal otolit

Kaynakça

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