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SIZE AT SEXUAL MATURITY, REPRODUCTIVE OUTPUT, AND SEASONAL REPRODUCTION OF PHILOCHERAS TRISPINOSUS (DECAPODA) IN PORT ERIN BAY, ISLE OF MAN

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ABSTRACT Aspects of the reproductive biology of the crangonid shrimp Philocheras trispinosus were studied. Size of female maturity was determined from the proportions of ovigerous females and of females with maturing ovaries. The size at which 50% of females are mature is estimated (±95% confidence intervals) as 3.69 ± 0.56-mm carapace length. Brood weight and fecundity were related isometrically with female body size. Based on dry weight, the reproductive output (mass of incubating eggs/mass of female) averaged 0.24. The main spawning season (percentage ovigerous > 50%), from March-August, was reflected by monthly values of the gonad index >9. The ovarian dry weight of females with eggs near to hatching was nearly fivefold higher than for those with newly laid eggs, and the ovarian dry weight was significantly different between each egg stage. This indicates that ovarian maturation occurs during incubation, suggesting that females were potentially consecutive breeders, capable of multiple spawning within a single reproductive season.

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/content/journals/10.1163/193724099x00051
1999-01-01
2016-12-04

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