[
    {
        "id": 210233,
        "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-1984",
        "page_number": 204,
        "title": "RAS-1984",
        "content_text": "183\n\nmarsh, which has been enclosed by bunds to form kei wais, (iv) a shallow channel running parallel to the outer bund; (v) a zone of mangrove plants some 15-25 m. wide with Kandelia candel, Avicennia marina and Aegiceras corniculatum as the commonest species, (vi) Deep Bay, which forms part of the estuary of the Pearl River and also receives water from the Sham Chun River and smaller streams. At intervals channels run through the mangrove zone to join channel (iv) beside the outer bund to Deep Bay; water moves along these channels during the rise and fall of the tide and thus the kei wais are filled.\n\nWithin the kei wais are small, irregularly shaped, muddy islands. Essentially all of our results were obtained from Mai Po kei wai No. 7 (total area ca 9.3 ha, area of islands 5.6 ha, area of open water 3.7 ha). This kei wai is 820 × 120 metres with its shorter sides parallel to the shoreline. It is surrounded by a bund which, on the seaward side, is pierced by a sluicegate with a concrete frame. The frame is about 2 m. wide and is usually closed by a gate consisting of heavy wooden planks, placed horizontally, which can be raised or lowered in slots in the concrete frame (Plates 7-9). The sluicegate is essential to the operation of the kei wai because it enables the operator to control exchange of water between the kei wai and the adjoining estuary. The kei wai, like others in the neighbourhood, was held on lease renewable every seven years.\n\nSource of Future Produce\n\nAs already mentioned, an important source of future produce is the adjoining estuary: fry and larvae are carried on the high tide through the open sluicegate into the kei wai where they are \"trapped\" when the gate is closed. Species entering in this way include marine fish, shrimps and crabs. In addition, the source of produce is supplemented and diversified by the operator, who may add fry of tilapia (Sarotherodon mossambicus, syn. Tilapia mossambica) and the brackish-water striped mullet (or grey mullet, Mugil cephalus). Small oysters (Crassostrea gigas) are bought from local fishermen and used to stock oyster beds set up in the vicinity of the sluicegate; their growth period is 1.5 to 3 years.\n\nThe basis of production of the kei wai is the usual two food",
        "txt_file_path": "txt/dfo323lmgvd/RAS-1984.txt",
        "external_url": "https://digitalrepository.lib.hku.hk/catalog/5h73wh572",
        "rank": 0
    },
    {
        "id": 210235,
        "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-1984",
        "page_number": 206,
        "title": "RAS-1984",
        "content_text": "185\n\n1900 h., at high tide, the wooden planks of the gate are removed and water from the estuary allowed to enter, when the water level is close to the maximum the gate is closed. At about 0100 h. next day, when the tide is falling, the gate is opened again, water flows out and the produce is trapped in a net secured across the sluice. Only a small proportion of the water is allowed to run out, and it is replaced on the next high tide.\n\nBy contrast, the fish harvest requires a large difference between high and low tide, and more than 90% of the water is run out. Consequently, large areas of the muddy bottom are exposed and the water is restricted to a pool in the vicinity of the gateway with shallow channels running back toward the landward end of the kei wai: Plates 10-14 show the situation. Actual collection of produce is done in several ways: (i) by trapping fish, shrimps etc. in a net secured across the sluice; (ii) by floating a sampan on the pool in the vicinity of the gateway and having the operator throw a large hand net and haul in the produce; prior to this procedure temporary netting fences are erected to prevent the animals from escaping along the shallow channels mentioned above; (iii) eels are collected by probing with a stout multi-pronged fork into the mud around the pool; (iv) oysters may be harvested if they are large enough. A list of the main economic produce is as follows:\n\nFish\n\nJapanese sea-perch (Lateolabrax japonicus)\n\nBlind sea-bass (Lates calcarifer)\n\nYellow-fin sea bream (Mylio latus)\n\nBlack sea bream (Mylio macrocephalus)\n\nTiger fish (Terapon sp.)\n\nArgus fish (Scatophagus argus)\n\nStriped mullet (Mugil cephalus)\n\nTilapia (Sarotherodon mossambicus)\n\nEel (Anguilla japonica)\n\nEel (Muraenesox sp.)\n\nShrimps\n\nMetapenaeus monoceros\n\nPenaeus penicillatus\n\nPenaeus orientalis\n\nPenaeus monodon\n\nPandalus sp.\n\nCrab\n\nSerrated crab (Scylla serrata)\n\nOyster\n\n(Crassostrea gigas)\n\nIn addition, the red seaweed Ceramium sp. grows extensively in",
        "txt_file_path": "txt/dfo323lmgvd/RAS-1984.txt",
        "external_url": "https://digitalrepository.lib.hku.hk/catalog/5h73wh572",
        "rank": 0
    },
    {
        "id": 210246,
        "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-1984",
        "page_number": 217,
        "title": "RAS-1984",
        "content_text": "196\n\nY.H. CHEUNG, K.Y. TAI, S.W. TSAO AND L.B. THROWER\n\nitems of diet for the higher trophic levels include phytoplankton, periphyton, polychaetes (eg. Nereis) and miscellaneous other invertebrates such as chironomid larvae, crustacean larvae, copepods (eg. Tigriopus japonicus), amphipods and isopods. The percentage composition of the gut contents of a range of animals is given in Table 5.\n\nTable 4. Characteristics of the bacterial colonies isolated from surface of mangrove leaves (Kandelia candel) after various periods of immersion in kei wai\n\n  \n    Period of immersion (days)\n    8\n    14\n    21\n    43\n  \n  \n    Character\n    \n    \n    \n    \n  \n  \n    Gram stain (+)\n    40*\n    30\n    67\n    60\n  \n  \n    Gram stain (-)\n    60\n    70\n    33\n    40\n  \n  \n    Rod\n    80\n    90\n    100\n    100\n  \n  \n    Coccus\n    20\n    10\n    0\n    0\n  \n  \n    Pigment\n    \n    \n    \n    \n  \n  \n    White\n    25\n    67\n    40\n    75\n  \n  \n    Yellow\n    22\n    Orange\n    0\n    0\n  \n  \n    Pink\n    11\n    Grey\n    0\n    0\n  \n  \n    Transparent\n    0\n    MooMoo\n    0\n    20\n  \n  \n    \n    \n    0\n    40\n    \n  \n  \n    Biochemical character\n    \n    \n    \n    \n  \n  \n    Glucose fermentation\n    25\n    \n    \n    \n  \n  \n    Starch hydrolysis\n    50\n    \n    \n    \n  \n  \n    Proteolysis\n    25\n    \n    \n    \n  \n  \n    Lipid hydrolysis\n    \n    \n    \n    \n  \n  \n    Cellulolysis\n    KAKKA\n    64\n    55\n    36\n  \n  \n    \n    20\n    75\n    63\n    50\n  \n  \n    \n    73\n    80\n    82\n    88\n  \n  \n    \n    30\n    30\n    70\n    22\n  \n  \n    \n    075\n    44\n    \n    \n  \n\n* Percentage of isolates possessing each character\n\nThe results show the importance of detritus of plant origin (plant fragments) in the diet of these animals. It was most important in the case of invertebrates where it accounted for 22-40% of the gut contents, but made up 30% of the gut content of striped mullet (Mugil cephalus). Moreover, other undefined detrital material (sediments and inorganic particles) also made up a large",
        "txt_file_path": "txt/dfo323lmgvd/RAS-1984.txt",
        "external_url": "https://digitalrepository.lib.hku.hk/catalog/5h73wh572",
        "rank": 0
    }
]