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Striped sea bream, Lithognuthus mormyrus L., are hermaphoroditic protandrous fish. Sex ratios are given for length and age classes, indicating the males change sex mainly at lengths between 25.0 and 32.5 cm, in a e classes 4 to 7, with more than 30 % of the population changing sex in age class 6 to 7. Males were afso observed up to a length of 34.5 cm. Length-weight relationship showed no significant difference from isometric growth in winter (b=3.05) and a negative allornetric growth in summer (b = 2.69). The a e composition was established using the Bhattacharya method and additional observations of annuaf rings on scales. Six age classes were obtained from Kagtela Bay (age 3: 21.7 cm, age 4: 26.5 cm, age 5: 28.4 cm, age 6: 30.3 cm, age 7: 31.6 cm, age 8: 33.4 cm) and from Mirna Bay (age 2.5: 19.4 cm, age 3.5: 24.1 cm, age 4.5: 26.9, age 5.5: 29.4 cm, age 6.5: 31.3 cm, age 7.5: 32.8 cm). Von Bertalanffy's growth equation was fitted to these mean length-at-age data resulting in parameter values of L, = 36.2 cm, K = 0.297, to = -0.08 for Kagtela Bay and L, = 37.3 cm, K = 0.262, to = -0.39 for Mirna Bay.

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