Some Biological Parameters of the Thin-Lipped Mullet Liza Ramada in Benghazi Coast - Libya
Abstract
Age, mortality rate (fishing and natural mortality), exploitation rate, survivor rate and Yield per
recruit for the species Liza ramada were established in Benghazi coast eastern coast of Libya. four age groups
were determined, the Von Bertalanffy growth equation of all individuals were estimated at 35.4 cm, 0.187 per
year, -1.14 years and 2.4 for L∞, k and t0
,respectively.
Total mortality estimated from linearized catch curve was equal = 0.4 per year, the natural mortality coefficient “M” and the fishing mortality coefficient “F” were estimated at 0.2 and 0.2 year respectively. The exploitation rate “E” was estimated 0.5 and survival rate “Z” was 0.7. Yield per recruit obtained was 46.8 gm at fishing mortality 0.2 and the maximum yield per recruit was 50.1 gm at maximum fishing mortality 0.4 per year.
Total mortality estimated from linearized catch curve was equal = 0.4 per year, the natural mortality coefficient “M” and the fishing mortality coefficient “F” were estimated at 0.2 and 0.2 year respectively. The exploitation rate “E” was estimated 0.5 and survival rate “Z” was 0.7. Yield per recruit obtained was 46.8 gm at fishing mortality 0.2 and the maximum yield per recruit was 50.1 gm at maximum fishing mortality 0.4 per year.
