Monthly length-frequency data of green tiger prawns from April 1985 to August 1990 were analyzed to estimate the von Bertalanffy growth curves and related parameters . The mean asymptotic carapace lengths (L ce ) and growth constants (K) over 5 seasons were 36 .6 mm and 1 .6 yr -1 for males and 51 .2 mm and 1 .7 yr-1 for females, respectively. Annual total mortality rates (Z) from 1985/86 to 1989/90 ranged from 2 .7 to 6 .5 yr -1 for males and from 2 .8 to 6 .8 yr1 for females . The mean exploitation rates calculated using the mean natural mortality rates (M) of 2 .5 yr1 for males and 2 .4 yr1 for females showed that the male green tiger prawns in Kuwait waters were under exploited, whereas the catch of females was very close to the sustainable yield . Chi-square tests indicated that the sex ratio was close to one for adults (CL > 26 mm), but significantly favoured males for recruits (CL < 26 mm) . A major recruitment was detected from June/July in all seasons and a minor recruitment in some seasons in August/September . The relative yield-per-recruit (Y' /R) reached the optimum at the length-at-first capture (L a ) of 25 mm CL for males, and increased as L, increased for females . The observed mean L, values were 23 .4 mm for both males and females. The Y'/R under the current exploitation level is close to the maximum sustainable yield for females, but lower for males . More fishing effort could be exerted to exploit males, but doing so may not be biologically or commercially possible with current trawling practices .
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