Production Characteristics of All‐male and Mixed‐sex Giant River Prawns, Macrobrachium rosenbergii, Grown in Earthen Ponds in Kentucky and Mississippi USA

JOURNAL OF THE WORLD AQUACULTURE SOCIETY(2015)

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摘要
Production and population characteristics of monosex male (all-male) giant river prawns, Macrobrachium rosenbergii, were compared with a normal (mixed-sex) population in separate studies in Mississippi and Kentucky (USA) under low and high density stocking conditions, respectively. In Study 1 (Mississippi), juvenile prawns were stocked into eight 0.05-0.06ha ponds at 24,700/ha. The mean stocking weight of all-male was 0.34g and mixed-sex was 0.39g. Prawns were fed 23% crude protein range cubes and harvested after 120d for the all-male prawns and 112d for mixed-sex prawns. In Study 2 (Kentucky), juvenile prawns from each group were stocked into six 0.04ha ponds at 60,000 juveniles per hectare. The mean stocking weight for all-male was 0.38g and for mixed-sex juveniles was 0.34g. Prawns were fed a commercial sinking pellet (33% protein) once daily at a standardized rate and harvested after 105d. In both locations survival of mixed-sex prawns and all-male prawns was not significantly different and the final average weight of all-male prawns was significantly greater than the average weight of mixed-sex prawns. For the study in Kentucky, total production was not significantly different between treatments, whereas in Mississippi total production in the all-male ponds was significantly higher than in the mixed-sex ponds. For both studies, the production size index of all-male prawns was significantly greater than that of mixed-sex prawns. In terms of population structure, in all-male ponds there was a significant increase in orange claw (OC) males compared with the mixed-sex ponds both as a percent of sex and a percent of total population. The increase in OC numbers in all-male populations may be due to a lack of females to stimulate the transition of males to the final, sexually mature, blue claw stage. As target weights increase from 20, 30, and 40g, the all-male populations were increasingly superior in terms of production (kg/ha) of those target sizes. The economic benefit of all-male over mixed-sex populations will be principally based on an examination of tradeoffs that primarily consider the cost difference of juveniles relative to the price differences for different final harvest weights.
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