The gathering of predators around the sea-cage fish farms in the Aegean Sea


Ceyhan T. , Akyol O. , Demir-Sağlam Y., Şen H. , Özgül A. , Düzbastılar F. O.

Cahiers De Biologie Marine, vol.61, no.4, pp.361-368, 2020 (Journal Indexed in SCI)

  • Publication Type: Article / Article
  • Volume: 61 Issue: 4
  • Publication Date: 2020
  • Doi Number: 10.21411/cbm.a.f8856c42
  • Title of Journal : Cahiers De Biologie Marine
  • Page Numbers: pp.361-368

Abstract

A total of 48 randomly selected fish farms from the coasts of Izmir and Muğla, Aegean Sea, were visited to face-to-face interviewing with fish farmers in the sea-cage fish farms between July 2015 and July 2017. Data were collected concerned mainly the following two aspects in the area: (i) actual problems on the sea-birds and other predators such as sharks, dolphins, monk seals, fishes; (ii) interactions between sea-cages and predator attacks. Around the sea-cage fish farms, 3 sea birds, Phalacrocorax carbo, Egretta alba and Larus michahellis, 2 marine mammals, Tursiops truncatus and Monachus monachus, 3 fish species, Pomatomus saltatrix, Thunnus thynnus and Prionace glauca, and one sea turtle, Caretta caretta, were declared as predators. The cormorant P. carbo had the highest ratio (24.3%) for being seen as a potential problem by fish farmers, followed by T. truncatus, T. thynnus and M. monachus. Great white egret, yellow-legged gull and cormorant were continuously observed by fish farmers. Seasonally, there were significant different incidences of the species (p < 0.05). Monk seal and bluefish were observed continuously, while blue shark had only been appeared during the collecting dead fish around the sea-cage fish farms.