PIMRIS Regional Repositry
close this section of the library Clam fisheries

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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 Fishing pressure on the resource of the elongated giant clam, Tridacna maxima, in Tonga (In Fisheries Research Bulletin of Tonga, Volume 3, 1995)
Author(s): Kava, V., Udagawa, K., Ikenoue, H.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1995
Notes: pp. 11-17
ASFA Keywords: Clam fisheries, Fishery statistics, Fishery data, Fishery management
Country Collection: Tonga
Abstract: The size distribution of T. maxima landed at Vuna Wharf fish market indicated that the stock of T. maxima was subjected to stronger fishing pressure in 1992-94 than in 1979. The stock of clams larger than 100mm SL has decreased to such a low level that the catch of larger clams cannot be increased by intensifying fising effort.

View the PDF document Giant clam fishing off Tongatapu Island (In Fisheries Research Bulletin of Tonga, Volume 2, 1994)
Author(s): Kava, V., Udagawa, K.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1994
Notes: pp. 43-46
ASFA Keywords: Clam fisheries, Resource management, Fishery data
Country Collection: Tonga
Abstract: It has long been said that resource management measures should be introduced to prevent depletion of giant clam resources casued by overfishing (Mckoy, 1980; Munro, 1993). However, scientifically justifiable management measures have not been established yet.

View the PDF document Giant clam marketing in Tonga (In Fisheries Research Bulletin of Tonga, Volume 5, 1996)
Author(s): Fa'anunu, 'U., Loto'ahea, T., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1996
Notes: pp. 69-75
ASFA Keywords: Clam fisheries, Clam culture, Market research, Marketing
Country Collection: Tonga
Abstract: In order to support the giant clam stock enhancement program in Tonga, and to earn foreign currency, several markets for the cultured giant clams were investigated. Only the aquarium market was found suitable for the current production level and growth rate of the clams.

View the PDF document Marketing trial of cultured giant clam, Tridacna gigas, in Tonga (In Fisheries Research Bulletin of Tonga, Volume 4, 1995)
Author(s): Fa'anunu, 'U., Paongo, 'O., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1995
Notes: pp. 7-13
ASFA Keywords: Clam fisheries, Clam culture, Marketing
Country Collection: Tonga
Abstract: A marketing trial of the cultured giant clam, Tridacna gigas, was carried out in October 1994. The clams were sold at T$1.00 - T$4.00 per piece depending on their size. All the clams on sale were 4-year old and still immature with no development of gonads.

View the PDF document Ocean culture of giant clam in Tonga: An aspect of managing giant clam resources (In Fisheries Research Bulletin of Tonga, Volume 4, 1995)
Author(s): Loto'ahea, T., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1995
Notes: pp. 25-30
ASFA Keywords: Clam fisheries, Clam culture, Fishery management
Country Collection: Tonga
Abstract: A series of surveys were conducted to ascertain the present situation of giant clam resources in Tonga. Tridacna derasa was found to be the most exploited species. In order to enhance the T. derasa resource, the ministry's hatchery is producing annually 50,000 seed clams for future release.

View the PDF document Present status of giant clam culture in Tonga (In Fisheries Research Bulletin of Tonga, Volume 5, 1996)
Author(s): Loto'ahea, T., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1996
Notes: pp. 59-68
ASFA Keywords: Clam culture, Clam fisheries, Stock assessment, Fishery management
Country Collection: Tonga
Abstract: In recent years, giant clam culture methods have been improved in Tonga as well as in many other countries. The appropriate number of giant clam productinos in the hatchery were sought with the aim of enhancing the giant clam resources in the wild.

View the PDF document Results of the field surveys on giant clam stock in the Tongatapu Island group (In Fisheries Research Bulletin of Tonga, Volume 3, 1995)
Author(s): Tu'avao, T., Loto'ahea, T., Udagawa, K., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Date: 1995
Notes: pp. 1-10
ASFA Keywords: Clam fisheries, Surveys, Fishery data, Fisheries development, Stock assessment
Country Collection: Tonga
Abstract: A series of surveys was conducted on the giant clam stocks in the Tongatapu Island group by the towing, free swimming, transect line and scuba diving methods. The density of T. maxima was high at Ha'atafu and Hakauiki Reef. The giant clam stock seems to have greatly decreased around Hakau Mamao Reef since 1979.

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