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¹ National Institute of Fisheries Science (NIFS), Inland Aquaculture Research Center, Changwon 51688, Korea
² National Institute of Fisheries Science (NIFS), Future Aquaculture Research Center, Jeju 63068, Korea
³ National Institute of Fisheries Science (NIFS), Tidal Flat Research Center, Gunsan 54014, Korea
⁴ Korea Maritime and Ocean University, Division of Marine Bioscience, Busan 49112, Korea DOI : 10.4194/1303-2712-v17_3_14 Viewed : 4042 - Downloaded : 3222 Histological changes in the Korean rose bitterling ( Rhodeus uyekii) organs during the early period of growth were observed in this study. Regarding the retina, this organ was first seen at 5 days post-hatching (DPH) and increased in size up to 53 DPH. The retina consisted of the optic nerve fiber layer (ONFL), ganglion cell layer (GCL), inner plexiform layer (IPL), inner nuclear layer (INL), outer plexiform layer (OPL), outer nuclear layer (ONL), outer limiting membrane (OLM), rod and cone layer (RCL), and epithelial layer (EL). The EL, RCL, OLM, and IPL increased in thickness, whereas the INL remained unchanged and the GCL thinned to 53 DPH. Regarding the kidney, this organ harbors many proximal tubules that appear as hollow ovals or circles upon histological examination of sections. A few small proximal tubules were observed at 5 DPH, and the number and size of proximal tubules increased steadily thereafter. The proximal tubule cells of kidney increased with time, with the minor axes remaining consistently shorter than the major axes throughout this period. With respect to the midgut epithelium, this organ was tightly stretched at 15 DPH, but it became wrinkled and folded by 53 DPH. The tissue density increased with time, and the nuclear height increased continuously from 15 DPH to 53 DPH. With respect to the gill, this organ developed gradually over time, with increases observed in the number and length of gill filaments and the number of gill lamella. These results may provide useful data for the successful breeding and rearing of the Korean rose bitterling. Keywords : Gill, histology, kidney, retina, Rhodeus uyekii