Feeding habits of two skate species, Raja miraletus Linnaeus, 1758 and Dipturus oxyrinchus (Linnaeus, 1758) (Chondrichthyes, Rajidae), around the Gökçeada Island (Northern Aegean Sea)

Year 2023, Volume: 40 Issue: 2, 110 - 117, 15.06.2023

Koray Cabbar Cahide Çiğdem Yığın

https://doi.org/10.12714/egejfas.40.2.04

Abstract

This study investigated the feeding habits of Raja miraletus Linnaeus, 1758 and Dipturus oxyrinchus (Linnaeus, 1758). For the purpose of this study, the specimens were obtained monthly from the commercial trawlers operating around the Gökçeada Island in the Northern Aegean Sea between February 2019 and February 2020. A total of 29 (24 female and 5 male) brown rays (Raja miraletus) and 36 (20 female and 16 male) longnosed skates (Dipturus oxyrinchus) were captured. The total lengths of the R. miraletus specimens ranged between 24.0 cm and 53.9 cm, while the D. oxyrinchus specimens measured between 17.1 cm and 85.0 cm. Total length-weight relationships of R. miraletus and D. oxyrinchus specimens, respectively; W=0.0002TL3.92 (R2=0.97) and W=0.0007TL3.43 (R2=0.97) were calculated. The analysis of the stomach content of the specimens showed that crustacea were the primary and the most important prey group for R. miraletus (IRI% = 67.09), followed by teleosts (IRI% = 1.00) and cephalopods (IRI% = 0.45). The D. oxyrinchus specimens were determined to primarily feed on crustacea (IRI% = 74.3), followed by teleosts (IRI% = 6.50) and nematoda (IRI% = 0.40).

Keywords

Feeding habits, Raja miraletus, Dipturus oxyrinchus, Gökçeada Island, Northern Aegean Sea

Supporting Institution

Scientific and Technological Research Council of Türkiye

Project Number

119Y060

Gökçeada (Kuzey Ege Denizi) çevresindeki iki vatoz türünün, Raja miraletus Linnaeus, 1758 ve Dipturus oxyrinchus (Linnaeus, 1758) (Chondrichthyes, Rajidae) beslenme alışkanlıkları

Abstract

Bu çalışmada Raja miraletus Linnaeus, 1758 ve Dipturus oxyrinchus'un (Linnaeus, 1758) beslenme alışkanlıkları incelenmiştir. Bu çalışmanın amacı doğrultusunda, Şubat 2019-Şubat 2020 tarihleri arasında Kuzey Ege'de Gökçeada ve çevresinde faaliyet gösteren ticari trol teknelerinden aylık olarak numuneler alınmıştır. Toplam 29 (24 dişi ve 5 erkek) kahverengi vatoz (Raja miraletus) ve 36 (20 dişi ve 16 erkek) sivriburun vatoz (Dipturus oxyrinchus) avlandı. R. miraletus örneklerinin total boyları 24,0 cm ile 53,9 cm arasında, D. oxyrinchus örneklerinin ise 17,1 cm ile 85,0 cm aralığında ölçülmüştür. R. miraletus ve D. oxyrinchus örneklerinin toplam boy-ağırlık ilişkileri sırasıyla; W=0,0002TL3,92 (R2=0,97) ve W=0,0007TL3,43 (R2=0,97) olarak hesaplanmıştır. Örneklerin mide içeriği analizi, kabukluların R. miraletus (%IRI = 67.09) için birincil ve en önemli av grubu olduğunu, onları kemikli balıklar (%IRI = 1.00) ve kafadan bacaklılar (%IRI = 0,45) takip ettiğini göstermiştir. D. oxyrinchus örneklerinin ise başlıca kabuklularla (%IRI = 74,3), ardından kemikli balıklarla (%IRI = 6,50) ve nematoda (%IRI = 0,40) beslendiği belirlenmiştir.

Keywords

Beslenme alışkanlıkları, Raja miraletus, Dipturus oxyrinchus, Gökçeada, Kuzey Ege Denizi

Project Number

119Y060

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