Size and age at sexual maturity of female Rana porosa porosa in valley bottoms in Machida City, Tokyo, Japan

Dai Togane, Kinji Fukuyama, Noboru Kuramoto

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The body size and age at maturity of female Rana porosa porosa were investigated in two valley bottoms in Tama Hills, Japan. Frogs collected during the breeding season, not showing the male secondary sexual characteristics, were subjected to injection of HCG and were kept with mature males. Individuals that did not ovulate after the dosage were dissected to determine sexes and maturity status on the basis of gonadal morphology. The snout-vent length (SVL) of the smallest mature female was 58.3 mm. The clutch size ranged from 1465 to 2726, and showed a significant positive correlation with SVL. The one-year-old age group of females included both mature and immature individuals, whereas two- and three-year-old females were invariably mature.

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalCurrent Herpetology
Issue number2
Publication statusPublished - 2009 Dec



  • Clutch size
  • Maturity age
  • Maturity size
  • Rana porosa porosa
  • Snoutvent length

ASJC Scopus subject areas

  • Animal Science and Zoology

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