Species Composition, Diversity and Length Frequency of By-Catch Sharks from the Syrian Coast
Hasan ALKUSAIRY1*,Adib SAAD1
Citation : Hasan ALKUSAIRY,Adib SAAD, Species Composition, Diversity and Length Frequency of By-Catch Sharks from the Syrian Coast International Journal of Research Studies in Zoology 2018, 4(1) : 11-21
This study examines the species diversity, abundance, length structure, sex ratio and possible nursery of caught sharks and from Syrian marine waters during the period from November 2014 to October 2016. A total of 17 species were recorded belonging to 11 families. The most abundant family was the Squalidae, contributing 28.33% to the total number of recorded shark species. The species Galeus melastomus was the most abundant 26.85%. The two families Hexanchidae and Carcharhinidae contributed 88.59% of the total weight of species, the most weight species was Hexanchus griseus 47.02%. The diversity index H, qualitative richness factor D and evenness factor J means ± S.D. were 1.70 ± 0.22, 1.88 ± 0.35 and 0.67 ± 0.08 respectively. The seasonally variation of the H and D means showed a high values in spring, while J mean showed a high value in winter. There were three abundant species and five common species off the Syrian coast. Many species comprised a high proportion of juveniles. Length structure analysis showed that sustainable populations for many species, which probably established in the Syrian marine waters, this region could be considered as a possible nursery area for many species.