Biological Aspect of Golden Grey Mullet, Liza Aurata (risso, 1810) from Bardawel lagoon, Egypt

Abstract

The present study presents biological aspects of golden grey mullet, Liza aurata (risso, 1810) from Bardawil lagoon, Egypt. A total of 1329 specimen's individuals of Liza aurata were collected from different landing sites of Bardawil Lagoon in the period from May 2017 to February 2018. Length-weight relationship, condition factor, age composition, and fish growth were studied. The length and weight ranged from 12.2 to 33.6 (cm) and 13.8 to 340 (g) respectively. The Length-Weight relationship (LWR) was determined according to the power regression model. The length-weight relation of Liza aurata in Bardawil Lagoon was found as W= 0.0071 L3.053 (r2 = 0.9756). The highest value of condition factor of the studied species was recorded in May and declined to lowest level in November. Growth and mortality were evaluated based on age estimation from scale readings of total 605 individuals. The Von Bartalanffy growth function to be Lt = 38.51 [1-e -0.2421(t+1.4222)] and Wt = 491.96 [1-e -0.2421(t+1.4222)] 3.053. The total (Z) and natural (M) mortality rates were found to be 0.8865 and 0.3543 years-1 respectively. The estimated exploitation rate was found to be E = 0.60 indicating that the current fishing pressure on L. aurata suffers from overfishing in the area of study.