The growth pattern and reproductive biology of Acanthopagrus latus were studied to derive information required for their management in the south part of Iran, Persian Gulf. Samples collected monthly from October 2014 to September 2015. Parameter values of the Von Bertalanffy growth function fit to length frequency data (males and females combined) were estimated as k = 0.23 per year, L∞ =50.4 cm (LF), t o = −0.7 years. Total, natural and fishing mortality (males and females combined) calculated as Z=0.87 per year, M=0.57 per year and F=0.3 per year, the exploitation rate were estimated for this species as E=0.45 per year. According to collected length data, A. latus exploited below the mean size at which females achieved first sexual maturity (24.4 cm LF). The length-weight relationships of males and females together estimated as, W=0.0939*LF 2.57 and exhibited negative allometric growth. Gonado-somatic index estimation indicated February as a spawning time for this species, with the main spawning period enduring to Jun. In general, parameters values obtained, characterized this species of relatively slow growing and long lived, which should be taken into consideration for sustainable management and exploitation for preventing overexploitation.

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Population parameters were estimated for goatfish (Upeneus sulphureus, Cuvier, 1829) as a small size and abundant species in the Persian Gulf ecosystem. A method of Tropfish R package based on length frequencies analysis was used. A total of 520 fish samples were taken monthly from landing stations in the coastal area of Iranian Waters in the Persian Gulf (Bushehr coasts) from January 2017 to December 2018. The length (FL) of the captured fishes varied from 8.5 to 17 cm with an average (±SD) of 11.20 (±2.24) cm. The values of the von Bertalanffy growth function fit length frequency data for U. sulphureus (combined sex) were estimated, as k = 1.2 per year, L∞ =19.43 cm (LF). Total, natural and fishing mortality calculated, as Z=3.74 per year, M=2.21 per year and F=1.53 per year, respectively. The exploitation ratio (E) was estimated at 0.4. The length-weight relationships of both sexes was estimated as, Log = -1.707+3.00 log (r = 0.92) which exhibited positive isometric growth. According to results, it could be concluded that goatfish (Upeneus sulphreus) is a relatively fast-growing and short-lived species. Although this species is not a direct target of fishermen, its ecological role in the Persian Gulf's food web due to their high abundance and high growth rate is undeniable.