Abstract
Abstract The influence of illumination and prey contrast on survival, growth, and feeding of larval yellow perch fed Artemia sp. nauplii was tested in an experimental upflow culture system. The treatment with high light level and high prey contrast (205 lux, black background) supported the best survival (mean, 44.2%) and growth (mean total length, 8.9 mm; mean wet weight, 5.0 mg) from hatching to age 14 d. Mean survival was 37.2% when light was low and prey contrast high (75 lux, black background). In the remainder of the tests, survival to age 14 d ranged from 0 to 6.9%. Low light and low prey contrast caused a 1–2 d delay in initial feeding. Visibility of the prey resulting from contrast with the surroundings, rather than light level, accounted for most of the variation in the ability of yellow perch larvae to acquire adequate food.
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