185
1900 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.
By 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:
Fish
Japanese sea-perch (Lateolabrax japonicus)
Blind sea-bass (Lates calcarifer)
Yellow-fin sea bream (Mylio latus)
Black sea bream (Mylio macrocephalus)
Tiger fish (Terapon sp.)
Argus fish (Scatophagus argus)
Striped mullet (Mugil cephalus)
Tilapia (Sarotherodon mossambicus)
Eel (Anguilla japonica)
Eel (Muraenesox sp.)
Shrimps
Metapenaeus monoceros
Penaeus penicillatus
Penaeus orientalis
Penaeus monodon
Pandalus sp.
Crab
Serrated crab (Scylla serrata)
Oyster
(Crassostrea gigas)
In addition, the red seaweed Ceramium sp. grows extensively in
185
1900 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.
By contrast, the fish harvest requires a large differences be- tween high and low tide, and more that 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 tempo- rary netting fences are erected to prevent the animals from escap- ing 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:
Fish
Shrimps
Japanese sea-perch (Lateolabrax japonicus) Metapenaeus
Blind sea-bass (Lates calcarifer)
Yellow-fin sea bream (Mylio latus) Black sea bream (Mylio marcocephalus) Tiger fish (Terapon sp.)
Argus fish (Scatophagus argus) Striped mullet (Mugil cephalus)
Tilapia (Sarotherodon mossambicus)
Eel (Anguilla japonica)
Ecl (Muraenesox sp.)
monoceros Penaeus penicillatus
Penaeus orientalis Penaeus monodon Pandalus sp.
Crab
Serrated crab
(Scylla serrata)
Oyster
(Crassostrea gigas)
In addition the red seaweed Ceramium sp. grows extensively in
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