Early Life History of Rhodeus Fish (R. uyekii and R. ocellatus) in the Nakdong River Water System
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초록
The purpose of this study is to investigate the early life history of the Rhodeus fish, Rhodeus uyekii and R. oc-ellatus, in the Nakdong River to use as the preliminary data for the systematic study. The embryos used in the study were ferti-lized eggs (embryo) and larvae after artificial fertilization. The long diameter of the eggs of the R. uyekii was 3.39-3.97 mm (average 3.68±0.41 mm, n=30) and the short diameter was 1.36-1.55 mm (average 1.45±0.13 mm, n=30). The long diameter of the eggs of the R. ocellatus was 2.53-2.71 mm (average 2.62±0.12 mm, n=30) and the short diameter was 1.47-1.60 mm (average 1.53±0.09 mm, n=30). Hatching time was 48 hours for the R. uyekii and 50 hours for the R. ocellatus given that the average water temperature was 21.5℃. The hatched larvae were 4.95-5.00 mm (average 4.98±0.04 mm, n=5) for the R. uyekii and the total length was 3.66-3.69 mm (average 3.67±0.02 mm, n=5) for the R. ocellatus. R. uyekii was found to be 15.5-15.8 mm at total length (average 15.6±0.21 mm, n=5) on the 56 days after hatching with the number of dorsal fins being ⅲ-9, anal fins ⅲ-10, ventral fins ⅲ-5. The R. ocellatus was found to be 15.8-16.0 mm (average 15.9±0.14 mm, n=5) at total length on the 58 days with the number of dorsal fins being ⅲ-11, anal fins ⅲ-12 and ventral fins ⅲ-5 where the number of all fin stalks reached maximum.
Abstract
The purpose of this study is to investigate the early life history of the Rhodeus fish, Rhodeus uyekii and R. oc-ellatus, in the Nakdong River to use as the preliminary data for the systematic study. The embryos used in the study were ferti-lized eggs (embryo) and larvae after artificial fertilization. The long diameter of the eggs of the R. uyekii was 3.39-3.97 mm (average 3.68±0.41 mm, n=30) and the short diameter was 1.36-1.55 mm (average 1.45±0.13 mm, n=30). The long diameter of the eggs of the R. ocellatus was 2.53-2.71 mm (average 2.62±0.12 mm, n=30) and the short diameter was 1.47-1.60 mm (average 1.53±0.09 mm, n=30). Hatching time was 48 hours for the R. uyekii and 50 hours for the R. ocellatus given that the average water temperature was 21.5℃. The hatched larvae were 4.95-5.00 mm (average 4.98±0.04 mm, n=5) for the R. uyekii and the total length was 3.66-3.69 mm (average 3.67±0.02 mm, n=5) for the R. ocellatus. R. uyekii was found to be 15.5-15.8 mm at total length (average 15.6±0.21 mm, n=5) on the 56 days after hatching with the number of dorsal fins being ⅲ-9, anal fins ⅲ-10, ventral fins ⅲ-5. The R. ocellatus was found to be 15.8-16.0 mm (average 15.9±0.14 mm, n=5) at total length on the 58 days with the number of dorsal fins being ⅲ-11, anal fins ⅲ-12 and ventral fins ⅲ-5 where the number of all fin stalks reached maximum.
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