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Age and growth of Lithognathus mormyrus Teleostei, Sparidae in Mediterranean waters off Alexandria, Egypt



Age and growth of Lithognathus mormyrus Teleostei, Sparidae in Mediterranean waters off Alexandria, Egypt



Egyptian Journal of Aquatic Research 312: 274-280



Data for length-weight relationship, age, growth and mortality-: were analyzed for Lithognathus mormyrus in the Mediterranean coast off Alexandria waters. Total length ranged between 8 and 25 cm and the gutted weight from 7.2 to 165 gm. The length-weight relationship was determined for males (log a=-1.719, b = 2.769), females (log a= -1.995, b=3.017) and combined sexes (log a= -1.869, b = 2.918). Growth in length was expressed with Von Bertalanffy growth equation. Growth parameters for males were (L infinity =36.01, k= 0.129, to= -0.982), for females (L infinity = 35.07. k = 0.133, to = - 1.527) and for the whole sample (L infinity =37.08, k = 0.127, to = -1.49).Total mortality (Z) was ( 0.675 for males and 0.591 for females), natural mortality (M) was ( 0.398 for males and 0.406 for females).

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