Survival and growth of silver perch, Bidyanus bidyanus, a salt-tolerant freshwater species, in inland saline groundwater from Southwestern New South Wales, Australia.

摘要

This study was conducted to determine the effect of saline ground water from inland New South Wales, Australia with or without potassium supplementation on growth and survival of silver perch (Bidyanus bidyanus). Silver perch fingerlings raised in earthen fresh water ponds were transferred to 500 litre experimental tank containing filtered saline ground water (n=40), fresh water (n=40), raw saline ground water (n=40), and raw saline ground water with potassium (10 gm/litre; n=40). Results revealed that there was no significant difference in the survival and absolute growth rate (AGR) of silver perch among the treatments. The survival and AGR of silver perch were 96.1+or-3.9% and 0.39+or-0.07 gm/day, respectively, in raw saline ground water with potassium. The observed feed conversion ratio (FCR) ranged between 1.3-1.8 and was not significantly influenced by either raw saline ground water with or without potassium. Water temperature, dissolved oxygen, pH and total ammonia nitrogen in tanks ranged between 10-16 degrees C, 5.2-6.8 mg/litre, 7.8-8.9 and 0.3-0.9 mg/ml, respectively. It is suggested that the silver perch can survive and grow in the saline ground water in inland areas of Australia..