Abstract
Cavefish, with sensitive lateral lines, can swim freely and locate preys in invisible and complex cave environments, though their eyes are greatly degenerated. Investigations on the morphology and distribution characteristics of their lateral line systems would benefit our understanding of the high-sensitivity mechanism of the fish. In this study, the arrangement and morphology of the lateral lines are described for two species of Sinocyclocheilus: S. macrophthalmus and S. microphthalmus, which live in the karst caves in Guangxi, China. The behavior experiments indicate that the lateral line system of the S. macrophthalmus is more sensitive at a low vibration frequency range from 20 Hz to 70 Hz. The cephalic and trunk lateral line systems both contribute to the efficient object-locating capability. For both of the two species of cavefish, the diameter of the lateral canal nearby the neuromasts is narrower than that nearby the canal pores. This variation can increase the normal pressure to the surface of the cupula, and increase the sensitivity of the canal lateral line system.
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Jiang, Y., Fu, J., Zhang, D. et al. Investigation on the lateral line systems of two cavefish: Sinocyclocheilus Macrophthalmus and S. Microphthalmus (Cypriniformes: Cyprinidae). J Bionic Eng 13, 108–114 (2016). https://doi.org/10.1016/S1672-6529(14)60164-5
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DOI: https://doi.org/10.1016/S1672-6529(14)60164-5