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No Thumbnail AvailableProjectTechnical assistance on oyster and pearl culture in Bangladesh
Fishery Advisory Services
1984Also available in:
No results found.This report covers the result of technical assistance extended to the Government of Bangladesh on the management of a pilot oyster culture farm at Cox Bazar and the establishment of a pearl culture project at Mymensingh. The programme was part of the activities of UNDP/FAO Fishery Advisory services Project (BGD 81/034 and FAO/TCP Pearl Culture Project (BGD/TCP 2308. The services of Mr. R. Pagcatipunan, FAO Edible Oyster and Pearl Culture Expert, was provided for the period from November 5, 1983 to October 4,1984. The Directorate of Fisheries of the Ministry of Fisheries and Livestock as the National Agency provided for the counterparts namely: -
Book (series)Pearl oyster health management: a manual. 2007
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No results found.The pearl oyster industry is a growing multibillion dollar sector of molluscan aquaculture. The end product of pearl farming, the pearl, is unique to this sector. Pearl production is entirely based upon health. The pearl itself is a product of the oyster’s immune defences as a response to soft-tissue irritation. Today, most disease problems are caused by opportunistic pathogens taking advantage of oysters weakened by the stress of handling, including pearl surgery and sub-optimal growi ng conditions. Further development of the industry will inevitably lead to increased risk of disease introduction, spread or emergence. Against such an unwanted future, health management is the critical line of defence. This publication provides guidance on the management of pearl oyster health and reviews pearl oyster mortalities and disease problems that will be useful for designing programmes aimed at reducing the risks from diseases. Part 1 consists of pearl oyster health – the c urrent interest in it and an overview of the cultured marine pearl industry. Part 2 examines pearl oyster health management and consists of seven sections, namely: (a) introduction; (b) general information on husbandry and handling, hatchery production, introductions and transfers; (c) disease diagnostic protocols dealing with field collections of samples, gross external examination, gross internal examination and laboratory protocols; (d) health zonation; (e) disease outbreak protocol s; (f) national strategies on aquatic animal health; and (g) references. Certain countries in the pearl oyster producing regions have acquired a great deal of experience in health management of cultured species. Experiences from Australia, the Cook Islands, Japan, French Polynesia, the Philippines, China, the Persian Gulf and the Red Sea are included in Part 3 which also contains a general review of pearl oyster mortalities and disease problems. -
No Thumbnail AvailableProjectA giant clam stock survey and preliminary investigation of pearl oyster resources in the Tokelau Islands
SOUTH PACIFIC AQUACULTURE DEVELOPMENT PROJECT
1989Also available in:
No results found.A stock survey of the two species of giant clam, Tridacna maxima (fahua nao) and T. squamosa (fahua taka) was carried out between 18 May - 15 June 1989 at the three atolls of Tokelau: Fakaofo, Nukunonu, and Atafu. The field surveys utilised small boats belonging to the Department of Agriculture and Fisheries. The survey team consisted of the author and Fisheries Officer covering all the atolls and Agriculture casual assistants at each atoll. A surface tow method was employed (2 divers, one each side of the boat) to count clams over measured distances. Tows were made around the perimeter of the lagoon reef covering depths up to 12-15m, around patch reefs in the centre of the lagoons, and two tows on the ocean side of each atoll. In addition, reef flat transects were made to determine clam densities over these large shallow areas bordering the lagoon. The following number of tows; reef flat transects were made: Fakaofo - 72;3, Nukunonu - 61;3, Atafu - 35;2. A preliminary investigation was also made to look at the presence of stocks of the black-lipped pearl oyster, Pinctada marqaritifera in the three atoll lagoons. Here, SCUBA was used to make dives from patch reefs or bommies in the lagoon to a maximum depth of 120ft [36m]. Densities of pearl oysters and spiny oysters (Spondylus sp.) were recorded at several depths down to 100 [30m] or 120ft. No live or dead pearl oyster shells were found in any of the atolls. Densities of Spondylus sp. were high at dive sites in Fakaofo lag oon (32–56/m2) but considerably less at Nukunonu (<1/m2) and Atafu (0–4/m2). The densities at Fakaofo indicate potential competition (for food and settlement) with spiny oysters if pearl oyster introduction is attempted. At Atafu specimens of the small species Pinctada maculata were found.
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