Abstract
Breeding of longnose emperor Lethrinus elongatus was studied on the basis of a year's sampling data from the commercial fishery of Jeddah (Red Sea). Six maturity stages were assigned to gonad development, based on visual inspection and ova diameter measurements. The spawning season extends about four months, from May to August, when water temperatures are around 30°C. Large variations in ova diameter within the ripe ovaries suggested multiple spawning. Length at 50% maturity (L60) attained during the third year of life was 22.9 and 23.5 cm for males and females, respectively. The predominance of females at earlier ages and males in older age groups suggests sex reversal during the fifth year of life.
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