Abstract:

Silver perch, Bidyanus bidyanus, fingerlings (mean weight 4.6 g) were stocked at a density of 43,000 fish•ha^-1 in a 0.3-ha static, aerated, pond and fed a 35% protein diet at daily rates up to 168 kg•ha^-1 for 14 months. Concentrations of total ammonia-nitrogen rose rapidly in summer and remained above 1.0 mg•l^-1. There was an outbreak of the mycotic disease, epizootic ulcerative syndrome, following a bloom of Microcystis and a rapid rise of pH and un-ionized ammonia-nitrogen to 0.39 mg•l^-1. An estimated 18.1% of fish harvested using a boat-mounted electrofisher had spinal damage and internal hemorrhaging. The overall survival rate was 69.7%, the mean weight 402 g and the food conversion ratio 2:3:1. A production of 12,146 kg•ha^-1 and a daily production rate of 27.8 kg•ha^-1 are the highest yet achieved with silver perch, confirming its potential for intensive culture in ponds with limited water exchange.

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Date 1995/06/01

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