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1 December 2009 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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Abstract

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.

© 2009 by The Herpetological Society of Japan
Dai Togane, Kinji Fukuyama, and Noboru Kuramoto "Size and Age at Sexual Maturity of Female Rana Porosa Porosa in Valley Bottoms in Machida City, Tokyo, Japan," Current Herpetology 28(2), 71-77, (1 December 2009). https://doi.org/10.3105/018.028.0204
Accepted: 1 November 2009; Published: 1 December 2009
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KEYWORDS
clutch size
Maturity age
maturity size
Rana porosa porosa
Snoutvent length
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