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Sex Ratio, Size at Reproductive Maturity, and Reproduction of the Hawaiian Kona Crab, Ranina ranina (Linnaeus) (Brachyura, Gymnopleura, Raninidae)

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Item Summary Fielding, Ann Haley, Samuel R. 2009-09-01T04:07:58Z 2009-09-01T04:07:58Z 1976-04
dc.identifier.citation Fielding A, Haley SR. 1976. Sex ratio, size at reproductive maturity, and reproduction of the Hawaiian Kona crab, Ranina ranina (Linnaeus) (Brachyura, Gymnopleura, Raninidae). Pac Sci 30(2): 131-145.
dc.identifier.issn 0030-8870
dc.description.abstract Sex ratio and size at reproduction of Ranina ranina (Linnaeus) in Hawaii were investigated. A sample of 1596 Kona crabs collected over 1 year in Hawaiian waters was examined to determine sex ratio and size at reproduction. Males constituted 55 percent of the overall samples and a similar proportion in all size classes. Males attain a larger maximum size than do females and have mature spermatozoa when their carapace length exceeds 60 mm. Secondary sexual characteristics in the male develop at a carapace length of about 75 mm. Females are ovigerous from May to September. Most ovarian growth occurs between February and May. In May, at the beginning of the spawning season, the number of eggs ovulated is a function of maternal body size: a 25-percent increase in carapace length is associated with a 200-percent increase in number of eggs ovulated. This is not so later in the spawning season (August-September). Larger females appear to ovulate at least twice each season, with the primary effort going into the first ovulation. The smallest 5-mm size class in which at least 50 percent of the females are ovigerous during the spawning season is 70.0-74.9 mm in carapace length. The mean minimum size of ovigerous females is 86 ± 8 mm in this dimension. The spermatheca in females is open to the outside at carapace lengths exceeding 60 mm. Eighteen crabs with carapace lengths less than 65 mm were captured. Half (31.9 mm-42.6 mm) were white in color and were all immature; the remaining half (43.6 mm-61.1 mm) were the usual orange color and all of these exhibited active gametogenesis. This correlation of color with size may be of significance for reproductive behavior.
dc.language.iso en-US
dc.publisher University of Hawaii Press
dc.title Sex Ratio, Size at Reproductive Maturity, and Reproduction of the Hawaiian Kona Crab, Ranina ranina (Linnaeus) (Brachyura, Gymnopleura, Raninidae)
dc.type Article
dc.type.dcmi Text
Appears in Collections: Pacific Science Volume 30, Number 2, 1976

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