ESTUARINE FISH FARMING
197
FIG. 16. Large Chanos pond in Taiwan. On the left and right there arc the bamboo
frames of the windbreak. There is a stack of rice straw a t the far end of the pond,
a fry pond in the right corner of the large pond and a canal in the foreground.
of producbion of 10 kglhectare during the period from March to November and a lesser rate of 5 kglhectare during the rest of the year.
Tang recommended fertilizer to stimulate the algal pasture, including a mixture of organic and inorganic fertilizer, based on an
analysis of the soils, and a system of pest control to decrease loss of
algal pasture. He recommends as follows :
General pest control of the bottom soils : 12-15 kg/hectare of nicotine,
or 15-18 kglhectare of saponin, or 1 000 kg/hectare of quicklime
(the last seems a very drastic remedy).
To kill undesirable fish use 3 p.p.m. saponin, or 5 p.p.m. rotenone
before the ponds are re-stocked.
To control chironomid larvae: 0.75 p.p.m. of gamma-BHC, or 0.5
p.p.m. of Diazinon, or 0.75 p.p.m. of Sumithion in pond water.
To control polychaete worms : 2 p.p.m. nicotine or 3p.p.m. of “Bayluscide ”.
To control snails : 12-15 kg/hectare of nicotine, or 15-18 kg/hectare
of saponin before the pond is filled with water, or 3 p.p.m. of “Bayluscide ” in the water.
197
FIG. 16. Large Chanos pond in Taiwan. On the left and right there arc the bamboo
frames of the windbreak. There is a stack of rice straw a t the far end of the pond,
a fry pond in the right corner of the large pond and a canal in the foreground.
of producbion of 10 kglhectare during the period from March to November and a lesser rate of 5 kglhectare during the rest of the year.
Tang recommended fertilizer to stimulate the algal pasture, including a mixture of organic and inorganic fertilizer, based on an
analysis of the soils, and a system of pest control to decrease loss of
algal pasture. He recommends as follows :
General pest control of the bottom soils : 12-15 kg/hectare of nicotine,
or 15-18 kglhectare of saponin, or 1 000 kg/hectare of quicklime
(the last seems a very drastic remedy).
To kill undesirable fish use 3 p.p.m. saponin, or 5 p.p.m. rotenone
before the ponds are re-stocked.
To control chironomid larvae: 0.75 p.p.m. of gamma-BHC, or 0.5
p.p.m. of Diazinon, or 0.75 p.p.m. of Sumithion in pond water.
To control polychaete worms : 2 p.p.m. nicotine or 3p.p.m. of “Bayluscide ”.
To control snails : 12-15 kg/hectare of nicotine, or 15-18 kg/hectare
of saponin before the pond is filled with water, or 3 p.p.m. of “Bayluscide ” in the water.