Spawning habitat selection and suitability for Japanese dace, Tribolodon hakonensis |
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Authors: | Yukinori Shirotori Motoyoshi Yamaguchi Kazumasa Ikuta Mayumi Murakami Hiroshi Hakoyama |
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Institution: | (1) Department of Education, Miyagi University of Education, Sendai 980-0845, Japan;(2) National Research Institute of Fisheries Science, Ueda 386-0031, Japan |
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Abstract: | We have investigated the effects of three current velocities and three substrate sizes (gravel to cobble) on the spawning behavior of Japanese dace, Tribolodon hakonensis, in spawning-induction and habitat-selection experiments. In the spawning-induction experiment under laboratory conditions the number of females induced to spawn was significantly fewer at low current velocity (ca. 5 cm s–1) than at medium (ca. 30 cm s–1) or high (ca. 50 cm s–1) current velocity. Females spawned independently of substrate size in the experimental tank, and did not bury their eggs in the substrate bed. In the habitat-selection experiment under field conditions, females selected the substrate microhabitat and spawned more frequently at a site with medium substrate size (very coarse gravel; major axis ca. 40 mm) than at sites with small (fine gravel; ca. 8 mm) or large (cobble; ca. 70 mm) substrate size. We conclude that Japanese dace select spawning sites at least partly on the basis of current velocity and substrate size, which affects the survival rate of eggs. |
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Keywords: | Tribolodon hakonensis Habitat selection Spawning habitat Current velocity Gravel size |
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