Title of article :
Growth, mortality and spawning season of the spangled emperor (Lethrinus nebulosus Forsskal, 1775)in coastal waters of Hormozgan Provincein the Persian Gulf and Oman Sea
Author/Authors :
Taghavi Motlagh ، S.A نويسنده Iranian Fisheries Research Organization, P.O.Box: 14155-6116 Tehran, Iran , , Vahabnezhad ، A نويسنده Faculty of Marine Science and Natural Resources, Tarbiat Modarres University, P.O.Box: 14115-356 Noor, Iran , , Seyfabadi ، S.J نويسنده - Faculty of Marine Science and Natural Resources, Tarbiat Modarres University, P.O.Box: 14115-356 Noor, Iran , , Ghodrati Shojaei ، M نويسنده Persian Gulf and Oman Sea Ecologiy Research Center, P.O.Box: 1597, Bandar Abbas, Iran , , Hakimelahi ، M نويسنده Hormouzgan University, P.O.Box: 3995, Bandar Abbas, Iran ,
Abstract :
nebulosus) were studied in coastal waters of Hormouzgan province. The monthly calculated mean values of gonadosomatic index (GSI) of females were indicate to increase from February, reach the highest in March and decline in June. The spawning season peak of L. nebulosus occurred in March. The Von Bertalanffy growth parameters, L?, K and t0 were estimated as, 67.2cm, 0.16.year-1 and -1.161 year, respectively. The relationship between weight and length (Fork Length) can be expressed as W=0.051 L2.722, which indicates that Spangled Emperor has negative alometric growth.
Using length converted catch curve, total mortality (Z) was estimated as 1.13 year-1 and natural mortality was estimated using Paulyʹs equation, as 0.57 per year. Finally, the fishing mortality (F) was 0.56, which gives an exploitation rate (E) of 0.50.
