カラシン目洞窟魚Astyanax mexicanusの陰影反応と光受容系の観察

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概要

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• 2010年度神奈川大学総合理学研究所共同研究助成論文Blind cavefish Astyanax mexicanus (order Characiformes) is a cavern river dwellerin the central and eastern parts of Mexico and Texas and, in the mature fish, its retarded eyes are embedded in the deep portion of the cranium. In contrast, its larva and juvenile temporarily have small but seemingly normal eyes. A previous investigator revealed that the cavefish juveniles show “shadow response”, that is, quickly start of the swimming movement toward the surface of the water just after turning off a circumferential light Yoshizawa et al., 2008). In the present study, using colored light, we examined the intensity and stage-dependent differences of the cavefish juveniles’ “shadow response” to light of a specific wavelength by regarding the evoked behavior as functional visual perception. Most of the tested cavefish juveniles at 3-4 days after fertilization strongly responded to blue and green lights. In contrast, red light could induce a significant but weak shadow response in only a small population. By histological observations, we found that ocular structures and optic nerves are still formed in the juveniles, but in adults, even though the mesencephalic structures are not malformed or retarded, the bundles of optic nerves are thin and conglutinated to the soft basal shell of the ventral cranial structure. We also attempted to reveal the auditory properties of blind cavefish, but significant differences were not detected with acoustic stimulation.

• 2011-06-30

著者

• 豊泉 龍児

  理学部応用生物科学科

• 小笠原 強

  理学部応用生物科学科

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• カラシン目洞窟魚Astyanax mexicanusの陰影反応と光受容系の観察

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