Species diversity and dominancy indexes in Izmir Bay (Aegean Sea) purse seine fishery
Makaleler > Tam Makale · 2020
Yazarlar: Şenbahar, Ahmet Mert, Güleç, Özlem, Zafer TOSUNOĞLU
DergiPark (Istanbul University), Uluslararası, 2020
Özet
Purse seine fishery is known with its importance in Aegean Sea to catch pelagic species. In this study, t o 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.