PIMRIS Regional Repositry
close this section of the library Loto'ahea, T.

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View the PDF document Breeding season of Tongan shellfish. 5. Short-spine sea urchin (Tukumisi), Tripneustes gratilla (In Fisheries Research Bulletin of Tonga, Volume 6, 1996)
Author(s): Loto'ahea, T., Sone, S.
Publisher: Ministry of Fisheries, Tonga
Place: Nuku'alofa (Tonga)
Notes: pp. 9-14
ASFA Keywords: Echinoderm fisheries, Breeding, Fishery development
Country Collection: Tonga
Abstract: Monthly samples of the short-spine sea urchin, Tripneustes gratilla, were taken at Vuna fish market in Nukualofa from January to November 1995. The average gonad index of each sample was determined and the seasonal trend was found to follow the seasonal change of sea water temperature with the exception of February and May.

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)
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 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)
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)
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)
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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