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Abstract
In a series of studies, growth and chemical composition of yellow perch, Perca flavescens originating from different stocks were compared. Juvenile yellow perch from Lake Mendota, Wisconsin were acquired in each year of four years and compared to stocks from Green Bay, Wisconsin; Pennsylvania; North Carolina; or Nebraska. Quadruplicate groups of each stock were cultured at 16°C, 22°C, or 28°C and fed a standard diet. Weight gain of fish from Lake Mendota at 16°C was significantly lower in three of the four years, and feed conversion ratio was significantly higher (P< 0.05) in two of the four years compared to other fish stocks. At 22°C, weight gain of fish from Pennsylvania was significantly higher than that of fish from Lake Mendota; other differences were not detected. Feed conversion ratio of fish from Lake Mendota cultured at 22°C was significantly higher than that of other stocks in three of the four years. Weight gain of fish from North Carolina was significantly higher than that of fish from Lake Mendota when cultured at 28°C. Feed conversion ratio of fish from Lake Mendota was significantly higher in two of the four years when cultured at 28°C. Whole-body lipid, moisture, and ash concentrations of yellow perch were significantly different; however, there were no clear trends in these data. If yellow perch are grown in stable thermal conditions such as indoor tank culture systems, perch with a proven record of good growth should be considered. If yellow perch are grown in outdoor culture systems, local stocks or those from similar latitudes should be considered because they experience the same thermal conditions.
