Material
Goldfish juveniles (80 d old) obtained from the ornamental fish culture farm of Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, India had an initial measurement of 1.67 ± 0.02 g and 55.20 ± 0.02 mm. Fish were released into glass jars (90 × 45 × 45 cm3; 182.25 l capacity) after acclimatising to prevailing laboratory conditions of water temperature (25–27 °C) and pH (7.6–8.0). Studies were conducted at room temperature (24.9–32.8 °C) for 60 days during June to August 2000.