Abstract
Evaluation of population parameters of Mugil liza caught at Guanabara Bay was conducted using size frequency and biological data. Total length ranged between 22.0 and 81.5 cm. The spawning season occurred between March and August. The size of the first maturity was estimated as 49.8 cm. The estimated growth parameters were L∞= 82.31 cm and K = 0.30 y −1. Instantaneous rate of total and natural mortalities were estimated as 1.02 and 0.56 y −1. The fishing mortality (F = 0.46 y −1) was greater than the optimum (Fopt= 0.28 y −1) and the limit of biological reference point (Flimit= 0.37 y −1). The exploitation rate (E=0.45) was higher than the E0.5= 0.33, suggesting that decreasing the current fishing effort could reduce exploitation within sustainable limits.
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