Türkiye'nin Akdeniz Kıyılarında Nadir Görülen Echeneis naucrates'in Son Kaydı

Abstract

Vantuz balığın bir bireyi Taşuçu Körfezi’nde Mayıs 2021 tarihinde 1 m derinlikte, fanyalı ağ ile yakalandı. Meristik parametreler yüzgeç ışını sayımları ile belirlendi. Metrik parametreler bireyin fotoğrafları üzerinden ölçüldü. Antalya Körfezi'ndeki son kayıt hariç, bu türün önceki kayıtları Mayıs ayından sonra, genellikle Temmuz ayında hem Akdeniz'de hem de Ege Denizi'nde gerçekleşmiştir. Taşuçu Körfezi’nde yakalanan bireyin biyometrik ölçümleri Ege Denizi ve orta Akdeniz’de (Tunus ve Sicilya suları) yakalananlarla karşılaştırıldığında farklı iken, Hırvatistan’dan bildirilenlere nispeten benzer bulunmuştur. Orta Akdeniz'deki bireylerde daha az önemli olsa da ana ayırıcı parametrelerin anal, pektoral ve dorsal yüzgeç ışınlarının sayısı olduğu tespit edilmiştir. Orta Akdeniz ve Yeni Zelanda'daki bireylerde vantuz disk laminalarının sayısı Türkiye kıyılarındaki bireylere göre daha yüksek (21 disk laminasının tamamı) bulunmuştur. İstatistiksel analizler (Principal Component ve Diskriminant analizleri), Ege Denizi, Orta ve Doğu Akdeniz'deki bireylerin biyometrik özelliklerini ayırt etmede meristik parametrelerin etkili olduğunu ortaya koymuştur. Boy-ağırlık ilişkisi, türün negatif allometrik büyümeye sahip olduğunu göstermiştir.

Keywords

• Vantuz balığı
• biyometri
• Levant Denizi
• Taşucu Körfezi

Recent Occurrence of Rare Echeneis naucrates from the Turkish Mediterranean Coast

Abstract

One specimen of live sharksucker was caught with a bottom trammel net in Taşucu Bay, south-eastern coast of Turkey, at 1 m depth on May, 2021. Meristic parameters were determined by fin ray counts and metric parameters were measured from the photos of the specimen. Excluding the recent record in Antalya Gulf, previous records of this species occurred later than May, generally in July in the Mediterranean Sea as well as in the Aegean Sea. The biometrical measurements were different in Taşucu Bay compared to those caught from the Aegean Sea and the central Mediterranean Sea (Tunisian and Sicilian waters), but relatively similar to those reported from Croatia. Major discriminative variables, albeit less significant in individuals from the central Mediterranean, were the number of anal, pectoral and dorsal fin rays. Numbers of suction disc laminae were higher in individuals from the central Mediterranean Sea and New Zealand than those from the Turkish coasts (all 21 disc laminae). The statistical analyses (Principal Component and Discriminant analyses) affirmed successful use of meristic parameters to differentiate the biometric characteristics of the species from the Aegean Sea, the central and eastern Mediterranean Sea. The length-weight relationship showed that the species had a negative allometric growth.

Keywords

• sharksucker
• biometrics
• Levantine Sea
• Taşucu Bay

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