Population biology of the little gulper shark Centrophorus uyato in Lebanese waters

作者：Lteif M^*; Mouawad R; Khalaf G; Lenfant P; Seret B; Verdoit Jarraya M

来源：Journal of Fish Biology, 2017, 91(5): 1491-1509.

DOI：10.1111/jfb.13484

• by-catch
• Centrophoridae
• Chondrichthyes
• distribution
• fisheries management
• reproduction

A total of 38 individuals of the heavily exploited little gulper shark Centrophorus uyato were collected from Lebanese coastal waters using bottom longlines and trammel nets of different meshes at depths ranging from 115 to 600m between May 2013 and February 2014. Their total lengths were between 45 and 94cm and their total mass was from 870 to 6700g. The sex ratio was not significantly different from 1:1, with 20 males and 18 females, but bathymetric sexual segregation occurred. Catch per net setting (CNS) was used as a relative abundance index to detect spatial distribution; trammel nets showed largest CNS ranging from 49 to 545kg per unit effort in the north and south, at depths from 120 to 200m, during spring and summer. The mass-length relationships demonstrated negative allometric growth (b<3) (males: M-T=0.3585L(T)(2071), r(2)=094; females: M-T=0.0239L(T)(2735), r(2)=064). The condition factor as well as the gonado-somatic and hepato-somatic indices of C. uyato in the study area were also calculated. The results are discussed in relation to the distribution, growth and reproduction as well as the management of C. uyato.

• 出版日期2017-11