Observations on the distribution of Galeus melastomus and Scyliorhinus canicula (Chondrichthyes, Scyliorhinidae) in the Mediterranean coast of Türkiye (Eastern Mediterranean)

Aydın C. M., Ünlüoğlu A., Tıraşın E. M., Akalın S., Dal İ., Cengiz Ç. C.

International Workshop on Elasmobranches, Hatay, Turkey, 05 July 2024

  • Publication Type: Conference Paper / Unpublished
  • City: Hatay
  • Country: Turkey
  • Dokuz Eylül University Affiliated: Yes

Abstract

This study investigates the biomass variations of two demersal cartilaginous fish, Galeus melastomus and Scyliorhinus canicula, by analysing the data collected from the "MEDITS" experimental bottom trawl surveys conducted in the Turkish Coasts of the Mediterranean Sea (GSA24) in 2017, 2021, 2022, and 2023. The mean biomass of G. melastomus fluctuated between 7.0 and 35.9 kg/km² across the years. The biomass with the minimum recorded value was 0.1 kg/km² in 2017, while the maximum was 135.2 kg/km² in 2023. On the other hand, the average biomass of S. canicula has varied between 1.6 and 9.7 kg/km². The minimum biomass was 0.7 kg/km² in 2023, while the maximum was 30.3 kg/km² in 2017. The biomass values of the two species in the examined area are also compared and discussed with those of other Mediterranean locations.

 

Keywords: Galeus melastomus, Scyliorhinus canicula, biomass, MEDITS, Eastern Mediterranean