テナガエビにおける体サイズの雌雄差と成長

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タイトル別名
  • SEXUAL DIFFERENCES IN BODY SIZE AND GROWTH OF A FRESHWATER PRAWN, MACROBRACHIUM NIPPONENSE, IN CAPTIVITY
  • テナガエビ ニ オケル タイ サイズ ノ シユウサ ト セイチョウ

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Sexual differences in growth rate were examined in the freshwater prawn Macrobrachium nipponense, by rearing field-collected juveniles for more than two years. The mean body length of females was greater than that of males at the first breeding season, by when almost all females had attained sexual maturity. It was hard to explain the sexual difference in body size observed in the natural population (larger mature males than females) in terms of the difference in growth rate during the first year in captivity, and that was attributed to the different age structure of mature individuals, viz., older (two years or over) males than females. The presence of such older males in this species was noted as being unique among freshwater caridean prawns and shrimps, in which males are usually smaller than females and both sexes have an annual life span.

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