[
    {
        "id": 207382,
        "series_id": 26,
        "series_slug": "histsyn-rashkb-journal-engine",
        "series_title": "RASHKB Journal 皇家亞洲學會香港分會學刊",
        "series_use_hku_proxy": false,
        "document_key": "RAS-1975",
        "page_number": 150,
        "title": "RAS-1975",
        "content_text": "BRIAN MORTON & P. S. WONG\n\npower. There is thus an advantage for an oyster farmer to possess a large family. Usually every member of the family participates in the work. Male members usually handle the more laborious procedures such as the laying of the cultch, the transfer of the oysters from one bed to the other and the harvesting of the oysters for resale. Female members may also participate in this work especially those young and strong enough--but more often they are in charge of separating the oysters from the cultch and the shucking and selling of the oysters. Younger members of the family assist with domestic chores.\n\nIn Deep Bay, the oysters are cultivated in the traditional manner i.e. by bottom-laying (*). This method involves the laying of cultch (*) on the muddy bottom to collect the oyster spat (#). The set oysters are then left to grow for one or two years in the breeding ground (*) before being transferred to the deeper fattening ground (†) for an additional period of one or more years prior to harvesting (#).\n\nElsewhere in the world various materials are used as cultch for the collection of spat. These include stones, shells, bamboo sticks (Cahn, 1950), lime coated roofing tiles or egg-crate fillers, cement dipped wood veneer rings or old fish nets (Needler, 1941; Quayle, 1969) and even sticks of the mangrove, Aegiceras majus (Roughley, 1922). In Hong Kong some ten years ago, rocks and shells (Plate 14; A, B) were most commonly used as cultch. The supply of rock from nearby shores has, however, been virtually exhausted. Consequently stones are now being replaced by concrete tiles (*) (Plate 14; C, D) or concrete posts (Plate 14; E, F). Stones and oyster shells of appropriate size and thickness are still collected and reserved as cultch whenever available. The oyster shells are first cleaned and placed in the sun for weathering prior to being used. Concrete slabs are made artificially at a cost of HK$500/10,000 (in 1974). Old concrete slabs or posts which remain unbroken after the oysters have been detached can be reused. They are cleaned to remove all fouling organisms and then dried in the sun.\n\nThe most important and labour intensive stage in the bottom-laying method of oyster culture is the collection of the spat (**). In Deep Bay oysters spawn from March to September when temperatures are high and salinities are low (Mok, 1973). As a consequence the cultch has to be laid within this period. However,\n\nPage 150\n\nPage 151",
        "txt_file_path": "txt/dfo323lmgvd/RAS-1975.txt",
        "external_url": "https://digitalrepository.lib.hku.hk/catalog/j0995146d",
        "rank": 0
    },
    {
        "id": 207388,
        "series_id": 26,
        "series_slug": "histsyn-rashkb-journal-engine",
        "series_title": "RASHKB Journal 皇家亞洲學會香港分會學刊",
        "series_use_hku_proxy": false,
        "document_key": "RAS-1975",
        "page_number": 156,
        "title": "RAS-1975",
        "content_text": "148\n\nBRIAN MORTON & P. S. WONG\n\nchi, 1966) by the application of anti-fouling paints. Undoubtedly the main disadvantage to this technique is that a large capital investment is required with high maintenance costs and a greater chance of damage and loss during a typhoon. As noted earlier oyster culture in Deep Bay is at present being run on a family basis lacking a large capital investment. The adoption of the more expensive raft method of culture would appear, under present socio-economic conditions, to be impossible. The setting up of a co-operative system by the oyster farmers concerned, together with an extension of the Government loan scheme for fisheries development to the oyster industry could enable the oyster farmers to obtain the necessary finance to improve the industry. With an available source of funds for investment and with further detailed research to determine the modifications required to ensure the success of a programme of modernisation in the special environment of Deep Bay, Hong Kong's oyster industry is not without a future.\n\nLITERATURE CITED\n\nBardach, J. E. and J. H. Ryther, 1968.\n\nThe Status and Potential of Aquaculture. American Institute of Biological Science, Washington, D.C. Vol. I (261pp.), Vol. II (224pp.).\n\nBromhall, J. D., 1958. On the biology and culture of the native oyster of Deep Bay, Hong Kong, Crassostrea sp. Hong Kong University Fisheries Journal, 2; 93-107.\n\nCahn, A. R., 1950. Oyster culture in Japan. The United States Fisheries and Wildlife Services Fisheries Leaflet, 383; 1-80.\n\nFurukawa, Atsushi, 1968. The raft method of oyster culture in Japan. In: Proceedings of the Oyster Culture Workshop (Ed. T. L. Linton). Marine Fisheries Division, Georgia Game and Fish Commission, Brunswick, Georgia, pp. 49-54.\n\nHong Kong Annual Departmental Report by the Director of Agriculture and Fisheries, 1953-54 to 1973-74. The Hong Kong Government.\n\nKnight-Jones, E. W., 1952. Reproduction of oysters in the rivers Crouch and Roach, Essex during 1947, 1948, 1949. Fishery Investigations, London, 18; 1-48.\n\nKorringa, P., 1947. Relations between the moon and periodicity in the breeding of animals. Ecological Monographs, 17; 347-381.\n\nLeung, C., B. S. Morton, K. F. Shortridge and P. S. Wong, 1975. The seasonal incidence of faecal bacteria in the tissues of the commercial oyster Crassostrea gigas Thunberg 1793 correlated with the hydrology of Deep Bay, Hong Kong. Proceedings of the Pacific Science Association Special Symposium in Marine Science, Hong Kong 1973; 114-127.",
        "txt_file_path": "txt/dfo323lmgvd/RAS-1975.txt",
        "external_url": "https://digitalrepository.lib.hku.hk/catalog/j0995146d",
        "rank": 0
    }
]