Abstract
The self-feeding abilities of individually reared rainbow trout Oncorhynchus mykiss were investigated under four different light intensities (7×10−2, 1×10°, 5×101, and 7×102 lx). There was no significant effect of light intensity on self-feeder learning ability and food wastage (which did not exceed 0.5%). However, there was high individual variability in the ability irrespective of light intensity. The total number of trigger actuations was significantly higher at 1×10° lx than at 7×10−2 and 5×101 lx. Feeding patterns during the light phase of a day were classified as early or late in relation to the timing of significant peaks in fish feeding, or non-steady. The last pattern was defined when significant peaks were not observed. Under 7×10−2, 1×10°, or 7×102 lx, a non-steady feeding pattern was the most common. Early feeding appeared only under the 1×10° lx regime with the random pattern, while the late pattern was observed under 7×10−2, 5×101, and 7×102 lx. Under 5×101 lx regime half of the fish fed in the afternoon. These results suggest that light intensity can affect the timing of feeding judged from the frequency of pulling bite tags, but does not affect waste or learning period.
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Mizusawa, K., Noble, C., Suzuki, K. et al. Effect of light intensity on self-feeding of rainbow trout Oncorhynchus mykiss reared individually. Fish Sci 73, 1001–1006 (2007). https://doi.org/10.1111/j.1444-2906.2007.01429.x
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DOI: https://doi.org/10.1111/j.1444-2906.2007.01429.x