Abstract
Many teleost fishes in lowland fresh waters spawn in ephemeral flooded areas, the bottoms of which are prone to hypoxia. Little is known about how embryos and larvae deal with these potentially hostile environments. This study examines the functional and behavioral ontogeny of one such species, the kissing loach (Parabotia curta). Kissing loach eggs are demersal and adhesive. Hatching occurs at 24.8 ± 0.1 h post-fertilization at 25°C, much earlier than most fish species. The newly hatched larvae are precocious with no functional mouth, fins or eye pigmentation. Swimbladder inflation normally occurs at about 4 days posthatch, even before which the hatched larvae moved immediately toward the water surface to hang from water moss. Experiments with larvae 20 h after hatching showed that they spent significantly less time on the bottom in hypoxic water (2 mg/l) than in normoxic water, and suggest that hypoxia is a major directive factor in eliciting surfacing behavior. For the kissing loach, we have previously reported short-term spawning after the formation of flood areas as well as wide scattering of the spawned eggs in the temporal flooded areas. These traits with the present results of hatching at an early stage and the immediate upward movement of larvae are considered to be effective strategies for using ephemeral, hypoxic flooded areas for reproduction.
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Acknowledgments
We are especially grateful to Dr. Masayoshi Maehata, Lake Biwa Museum, for his guidance on the artificial breeding of kissing loach. We thank Mr. Ichiro Kobayashi, Mr. Yoshiaki Okamoto, Mr. Yusuke Kashiwa, Mr. Yoshio Kanou, Ms. Maria Abe and the members of Okayama Freshwater Fish Society for their assistance during the course of this study. We also thank Dr. Takaaki Shimizu, Ehime Prefectural Chuyo Fisheries Experimental Station, and Mr. Ryota Kawanishi, Graduate School of Science and Engineering, Ehime University, for their helpful information on the loaches. I am grateful to Dr. Katsutoshi Watanabe, Division of Biological Science, Graduate School of Science, Kyoto University, for helpful suggestions for this study. This study was supported by the Japan Society for the Promotion of Science: Grant nos. 204924 (T.A.), 19570057 and 22570065 (T.S.), the municipal offices of Seto and Okayama, and Kirin Brewery Co. Ltd. (Okayama Brewery). T.A. was supported by research fellowships from the Japan Society for the Promotion of Science for young scientists.
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Abe, T., Sakamoto, T. Embryonic development and larval behavior of the kissing loach (Parabotia curta): adaptations to an ephemeral, hypoxic environment. Ichthyol Res 58, 238–244 (2011). https://doi.org/10.1007/s10228-011-0217-3
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DOI: https://doi.org/10.1007/s10228-011-0217-3