Summary: Chinese sturgeon (Acipenser sinensis Gray) is anadromous species. They were declared as endangered species in China. Vision is an important cue in larval survival to capture prey. Thereafter, we examined the development of the retina structure during ontogenesis, the density of single cones, the ganglion cells and the nuclei of the outer nuclear layer of newly hatched larvae, covering different developmental stages ranging from hatching (13.3-13.6 mm TL) to 180 days post-hatching (dph) (290.7-301.6 mm TL). At hatching, larvae exhibited an undifferentiated retina. The retina of 3 dph (16.0-16.9 mm TL) had single cones (SC) with high density. The rods appeared at 9 dph (24.8-25.5 mm TL), and it is assumed that at this time the visual system was developed completely. However, the larvae did not show apparent retinomotor responses until 25 dph (42.7-44.1 mm TL). The density of single cones (SC) and ganglion cells (G) decreased with proceeding development, while the density of the rods (R) gradually increased. The ratio of nuclei of the outer nuclear layer to ganglion cells (ON/G) per 100 μm increased, and so did the ratio of nuclei of the outer nuclear layer to single cones (ON/SC). The investigation showed that the structure of the retina changed rapidly from 9 to 17 dph, and many became fully functional at 25 dph when retinomotor responses occurred. This is the transitional period of the ontogenetic development of the visual system. These changes in the retina of Chinese sturgeon are adaptive to their feeding requirements, and co-inciding with the ecological shift from surface to benthic habitats.

附件下載：Y.Chai, C.Xie, Q.Wei, et al.The Ontogeny of the Retina of Chinese Sturgeon(Acipenser sinensis). J.Appl.Ichthyol. 2006,22(Suppl.1): 196-201.pdf