Holding tanks 10-t concrete and hiding places PVC pipes, concrete hollow blocks,
and coconut palms were disinfected with 200 ppm formalin and rinsed. In the holding .
tanks, the juveniles were first fed daily with chopped by-catch andror Acetes at 5–10%
of the biomass. Some batches were weaned to formulated pelleted diet at 3–5% of the
biomass by mixing by-catch and pellets 75:25% by weight for 9 days. Then a mixture
of 50:50% for 6 days, 25:75% for 10 days, and an all pellet diet was fed afterwards.
Salinity was lowered gradually over 3 weeks to 10 ppt to discourage marine parasites
and bacteria.
Fish infected with leeches Piscicola sp. and nematodes were bathed in 50–100 ppm
formalin for 1 h repeatedly for 4 days. Since not all leeches and worms were removed
with formalin, the rest were eradicated manually. Fish with skin lesions were bathed in
10–20 ppm oxytetracycline repeatedly for 5 days.