PIMRIS Regional Repositry
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close this section of the library Breeding seasons

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View the PDF document Breeding season of the Tongan shellfish 3. Elongated giant clam (kukukuku), Tridacna maxima (In Fisheries Research Bulletin of Tonga, Volume 3, 1995)
Author(s): Manu, N., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1995
Notes: pp. 25-33
ASFA Keywords: Clam fisheries, Breeding, Breeding seasons
Country Collection: Tonga
Abstract: Monthly samples of T. maxima were taken at Vuna Wharf fish market in Tongatapu Island from April 1992 to March 1993. T. maxima at 40-59mm SL were all male. The ratio of hermaphrodite shells grandually increased from 60mm SL to 140mm SL at which size all shells became hermaphrodite.

View the PDF document Breeding season of the Tongan shellfish. 4. Turbans ('Elili), Turbo spp. (In Fisheries Research Bulletin of Tonga, Volume 6, 1996)
Author(s): Manu, N., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1996
Notes: pp. 1-8
ASFA Keywords: Shellfish fishery, Breeding seasons, Fishery development
Country Collection: Tonga
Abstract: Monthly samples of Turbo setosus were taken in the Tongatapu island group from April 1992 to March 1993. The maximum gonad index was observed in April 1992, however, another three peaks also appeared with 3 - 4 months intervals. Spawning of T. setosus seems to occur throughout the year in Tonga.

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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