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qing shi ban yu shi wang mo yun dong fan ying de te xing
Pages: 417-421
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  视网膜运动反应视锥青石斑鱼明适应暗适应色素颗粒样体持续光照环境照度潜伏期;
Abstract: The characters of retinomotor response in the retina of banded grouper obtained from seawater in Xiamen and Longhai was inves+igated in 1987. The study included time course of retinomotor response and influence of endogenous rhythmic system on the retinomotor response. The results showed:(1)From light-to-dark adaptation, both elongation of cone myoids and aggregation of REP pigment granules exhibited a latent period of up to 15 minutes, and were completed in 75 minutes in darkness. It was found that elongation of cone myoids and aggregation of REP pigment granules occurred at linear rates of 2.2μm/min and 2.7μm/min respectively. The movements began immediately after dark-to-light transition in both REP and cones, and were completed in 15 min after illumination. The contraction of cone myoids and dispersion of REP pigment granules proceeded at linear rates of 8.9μm/min and 10.8μm/min respectively.(2)Under the period of both constant darkness and constant light, the fish did not show a circadian rhythm in the position of cone cells and REP. This may indicate retinomotor responses were mainly controlled by light, and slightly by an endogenous circadian rhythic system. It might be due to the rock crevice environment at the bottom of neritic zone where the fish lives with very little variation in light intensity and their inactive habit.
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