Abstract
AbstractWe examined the effect of photoperiod on growth and feed efficiency of fingerling walleyes Sander vitreus cultured in a water reuse aquaculture system in northern Illinois from fall to late winter. We evaluated three photoperiod regimens over 24‐h days: continuous light (24 h), 18‐h light, and 12‐h light. Twelve, 0.55‐m3 tanks (four/treatment) were each stocked with 100 feed‐trained walleyes (10.9 kg/m3; 196–203 mm total length, 61–66 g in weight). Survival over the 131‐d culture interval was greater than 98.8% in all photoperiod treatments. All measures of growth were significantly slower and feeding efficiency was lower for fish in the 12 h of light treatment than for the 24‐h and 18‐h light treatments. Differences in performance between the 24‐h and 18‐h treatments were not significant, but all measures of growth and feed efficiency were higher for fish in continuous light than in the 18‐h group. The findings support use of continuous, in‐tank lighting for intensive culture of fingerlings walleye.
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