PIMRIS Regional Repositry
close this section of the library Shellfish fisheries

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View the PDF document Breeding season of Tongan shellfish. 1. Venus clam (To'o), Gafrarium spp. (In Fisheries Research Bulletin of Tonga, Volume 1, 1994)
Author(s): Sone, S.
Publisher: Tonga Ministry of Fisheries
Place: Nuku'alofa (Tonga)
Date: 1994
Notes: pp. 13-19
ASFA Keywords: Shellfish fisheries, Breeding seasons
Country Collection: Tonga
Abstract: Monthly samples of venus clams, Gafrarium pectinatum and G. tumidum, were taken at Vuna fish market in Nuku'alofa throughout the year. Examination of gonadal maturation condition of the samples showed that the spawning of G. pectinatum occurs throughout the year while that of G. tumidum occurs only in summer months from November to March.

View the PDF document Breeding season of Tongan shellfish. 2. Ark clams (Kaloa'a), Anadara spp. (In Fisheries Research Bulletin of Tonga, Volume 2, 1994)
Author(s): Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1994
Notes: pp. 19-26
ASFA Keywords: Breeding seasons, Shellfish fisheries, Mollusc fisheries
Country Collection: Tonga
Abstract: By examination of sex ratio of A. antiquata and A. maculosa of various size groups, it has been shown that the former species performs sex inversion from male to female at the size range between 45mm and 60mm in shell length. The latter species does not seem to perform such sex inversion.

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