The experiment was conducted from 28 July to 23
December 1987 at Ayuthaya Freshwater Fisheries
Station, located approximately 70 km north of
Bangkok, Thailand. Two 250 m2 (10 m x 25 m)
earthen ponds were used for the experiment. Two
cages (2 m x 2 m x 1.2 m), made of bamboo frames
and covered with 1 cm mesh nylon net, were
suspended 20 cm off the bottom near the center of the
pond, where the water depth was maintained at 1 m.
A wooden platform was built to connect the cages to
the pond bank for feeding, sampling and other
services. The cages were covered with black plastic
nets to prevent bird predation and to darken the
growth environment.