Abstract
Abstract The growth and reproductive biology of the freshwater shrimp Exopalaemon modestus were studied in Young-am Lake, Korea, from January to December 1999. Female maturity was determined by the size of ovigerous females and of females with maturing ovary. The size at which 50% of females are mature is estimated as 11.55 ± 1.95 mm carapace length. Brood size was isometric functions of female body size. Based on dry weight, the reproductive output (mass of incubating eggs/mass of female) averaged 0.17. Ovigerous females occurred in May–September. Higher gonad index was observed from May–June (percentage ovigerous > 50%). Significant difference in ovarian weight between females with noneyed eggs and eyed-egg stage was found. This indicates that ovarian maturation occurs during the incubation time, suggesting that females were potentially consecutive breeders, capable of multiple spawning during a reproductive season. Spawning by a single female seems to occur consecutively in a single reproductive period...
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