The length and weight relationships and feeding ecology of knout goby, Mesogobius batrachocephalus (Pallas, 1814) from Southern Black Sea

Elizabeth Grace Tunka Bengil; Mehmet Aydın

doi:10.12714/egejfas.37.4.12

TR EN

Güney Karadeniz’den kayabalığı Mesogobius batrachocephalus (Pallas, 1814) türünün boy-ağırlık ilişkileri ve beslenme ekolojisi

Öz

Ekolojik olarak çok çeşitlilik gösteren kayabalığı türlerinden, daha önce Gobius batrachocephalus olarak bilinen kayabalığı Mesogobius batrachocephalus (Pallas, 1814) türü Karadeniz endemiği bir türdür. Karadeniz’de türün biyolojik özellikleri üzerine çalışmalar bulunmasına karşın Karadeniz’in Türkiye kıyılarından sadece boy-ağırlık ilişkilerine dair çalışmalar bulunmaktadır. Bu çalışma Karadeniz’de türün boy-ağırlık ilişkisi ve beslenme ekolojisi üzerine olan bilgi eksikliğine katkı sağlamayı hedelemektedir. Toplamda 470 birey toplanmış olup daha önce negatif (-) allometri gösterdiği rapor edilmiş olan kayabalığının bu çalışmada bahar döneminde negatif (-) ve diğer mevsimlerde positif (+) allometri gösterdiği tespit edilmiştir. Besinini krustaseler, teleost balıklar ve
gastropodlar oluşturmaktadır. Göreceli önemlilik indeksi analizine göre tüm bireyler ve erkekler için teleost balıklar ve dişiler için krustaseler ana besin grubunu oluşturmaktadır. Tüm bireyler için trofik seviye 4.34 bulunmuş olup dişilerin erkeklerden daha yüksek trofik seviyeye sahip olduğu gözlemlenmiştir. Yazın her iki cinsiyette sadece teleost balıkları tercih etmelerine karşın diğer mevsimlerde dişiler erkeklerden daha çok krustaseleri tercih etmektedir. Niş genişliği indeks sonuçlarına göre mevsimler karşılaştırıldığında kışın en geniş ve yazın en dar olduğu, dişilerin sonbaharda ve erkeklerin kışın en geniş sonuçlara sahip olduğu bulunmuştur. Sonuç olarak, türün beslenme ekolojisi mevsimsel ve eşeyler arası değişiklik göstermekte ama genel besin grupları aynı kalmaktadır.

Anahtar Kelimeler

The length and weight relationships and feeding ecology of knout goby, Mesogobius batrachocephalus (Pallas, 1814) from Southern Black Sea

Abstract

Among ecologically diverse gobies species, knout goby, Mesogobius batrachocephalus (Pallas, 1814), or previously known as Gobius batrachocephalus, is a Black Sea endemic species. There are studies on this species biological features along the Black Sea but there are only studies on its length and weight relationship along the Turkish coasts of the Black Sea. This study aims to contribute to the lack of knowledge on knout goby length and weight relationship and feeding ecology inhabiting Southern Black Sea. Total of 470 individual of knout goby was collected and it was previously reported that knout goby shows negative (-) allometry though within this study it was found that it only shows negative (-) allometry in spring and positive (+) allometry in other seasons. The diet was composed of crustaceans, teleost fishes and gastropods. According to the relative importance analysis, teleost fishes are the main food item for all and male individuals but for female crustaceans are the main food item. Trophic level results show that for all individuals trophic levels is 4.34, and when sexes are compared females have higher trophic level than males. While both sexes only consume teleost during summer, in other seasons females prefer more crustacean in their diet compared to males. Niche breadth index results indicated that when all individuals diet was compared among seasons in winter the niche breadth was the broader and summer was the narrower, in case of females the broader was fall and for males it was winter. In conclusion, feeding ecology of knout goby changes between seasons and sexes but general prey groups remain the same

Keywords

Supporting Institution

Ordu University

Project Number

Project No. AP-1735

Thanks

This study was supported by Ordu University Research Fund Project No. AP-1735.

References

Ak, O., Kutlu, S. & Aydın, İ. (2009). Length-weight relationship for 16 fish species from the Eastern black Sea, Turkey. Turkish Journal of Fisheries and Aquatic Sciences, 9, 125-128.
Aydın, M., Karadurmuş, U. & Mutlu, C. (2013). The Crab Species of the Middle and East Black Sea (Turkey). The Black Sea Journal of Sciences. 3(9), 1-16.
Çalık, S., & Erdoğan Sağlam, N. (2017). Length-weight relationships of demersal fish species caught by bottom trawl from Eastern Black Sea (Turkey). Cah. Biol. Mar, 58, 485-490.
Demirhan, S.A. & Can, M.F. (2007). Length–weight relationships for seven fish species from the southeastern Black Sea. Journal of Applied Ichthyology, 23(3), 282-283. DOI: 10.1111/j.1439-0426.2007.00835.x
Fischer, W., Schneider, M. & Bauchot M.L. (1987). Méditerranée et Mer Noire (Zone de Pêche 37). Fiches FAO d'identification des espèces pour les besoins de la pêche. Volume 1, 1530 pp.
Freyhof, J. (2011). Diversity and distribution of freshwater gobies from the Mediterranean, the Black and Caspian seas. The Biology of Gobies. Science Publishers, Enfield, NH, 279-288. DOI: 10.1201/b11397-19
Froese, R. & D. Pauly. Editors. (2019). FishBase. Mesogobius batrachocephalus (Pallas, 1814). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=126909 on 2019-02-15
Karachle, P.K. & Stergiou, K.I. (2012). Morphometrics and allometry in fishes. In Morphometrics. InTech.

Details

Primary Language

English

Subjects

Hydrobiology

Journal Section

Research Article

Authors

Elizabeth Grace Tunka Bengil ^*
0000-0002-0071-3786
Türkiye

Mehmet Aydın
0000-0003-1163-6461
Türkiye

Publication Date

December 15, 2020

Submission Date

April 9, 2020

Acceptance Date

June 26, 2020

Published in Issue

Year 2020 Volume: 37 Number: 4

DOI

https://doi.org/10.12714/egejfas.37.4.12

IZ

https://izlik.org/JA82ZM94NH

Cite

RIS / Bibtex

APA

Bengil, E. G. T., & Aydın, M. (2020). The length and weight relationships and feeding ecology of knout goby, Mesogobius batrachocephalus (Pallas, 1814) from Southern Black Sea. Ege Journal of Fisheries and Aquatic Sciences, 37(4), 409-414. https://doi.org/10.12714/egejfas.37.4.12

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THE LENGTH-WEIGHT RELATIONSIPS OF SOME FISH SPECIES ALONG THE TURKISH COASTS OF BLACK SEA

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The first data on the population parameters and morphometry of Mesogobius batrachocephalus (Pallas 1814) (Family: Gobiidae) in the southern Black Sea

Aquatic Research

https://doi.org/10.3153/AR21009