Abstract
The effects of artificial water-level manipulations in Lake Biwa, initiated in 1992 to prevent flooding, on cyprinid fish larvae were assessed by measuring and estimating the topographic change in the reed zones. The shallow, litter-accumulated water in those zones was inhabited by larvae of two species, Carassius spp. and Cyprinus carpio. More than 70% (by volume) of these shallow areas in Lake Biwa was estimated to be lost when the water level was artificially lowered by 30cm from June to October 1997. During the low water level period, significantly fewer eggs of these cyprinid fishes were collected in a reed zone than in April and May of the same year, a comparison with a previous study suggesting that spawning of the fishes was inhibited during the period of low water level. The artificial reductions in water level probably resulted in a significant decrease in the volume of shallow water in the lake and may be linked to the drastic decline in these cyprinid fishes.
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Yamamoto, T., Kohmatsu, Y. & Yuma, M. Effects of summer drawdown on cyprinid fish larvae in Lake Biwa, Japan. Limnology 7, 75–82 (2006). https://doi.org/10.1007/s10201-006-0172-2
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DOI: https://doi.org/10.1007/s10201-006-0172-2