Species diversity and dominancy indexes in Izmir Bay (Aegean Sea) purse seine fishery
Articles > Article · 2020
Authors: Ahmet Mert Şenbahar, Özlem Güleç, Zafer TOSUNOĞLU
Ege Journal of Fisheries and Aquatic Sciences, Refereed Journals of Other Institutions, International, Scopus, 2020, vol 37, pp 353-356
Summary
Purse seine fishery is known with its importance in Aegean Sea to catch pelagic species. In this study, to determine the diversity index values of species caught by purse seine, all samplings were carried out between September 2, 2017, and April 6, 2018 in Izmir Bay. As a result, a total of 17 fish species (Osteichthyes) belonging to 11 families and also 2 species from invertebrates (Cephalopoda and Arthropoda) were determined. Bony fishes and invertebrates consist of 99.9% and 0.1% of the total biomass, respectively. Sardina pilchardus was the most dominated species that occupied as 80.2% of the overall bony fishes followed by Engraulis encrasicolus (14.6%) and Sardinella aurita (1.5%). Diversity index values of species were found-1.026 by Shannon-Weaver and 0.63 by Simpsons, respectively. The highest dominancy was found for S. pilchardus with 71.1%. Overall final results indicate that the diversity of species in Izmir Bay purse seine fishery is very low and also S. pilchardus is the most over-dominant species.