The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Microstructure of Otoliths and Early Growth of River Puffer, Takifugu Obscurus

황복, Takifugu Obscurus의 초기성장과 이석의 미세구조

  • Published : 2003.08.01
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Abstract

Microstructure of otoliths and early growth in total length of laboratory-reared river puffer, Takrifugu obscurus were observed from 1 to 63 days after hatching. The total length of Takifugu obscurus was 3.09${\pm}$0.02 mm, 4.96${\pm}$0.24 mm, 5.39${\pm}$0.42 mm,9.13${\pm}$0.59 mm, 10.78${\pm}$0.96, 16.40${\pm}$2.31 mm, 30.49${\pm}$l.53 mm in 1, 10, 20, 30, 34, 43, 63 days respectively. The mean radius of otoliths was 14.20${\pm}$1.21 $\mu\textrm{m}$ in 1 day, 31.06${\pm}$2.31 $\mu\textrm{m}$ in 10 days,57.19${\pm}$6.19 $\mu\textrm{m}$ in 20 days,127.13${\pm}$13.13 $\mu\textrm{m}$ in 34 days,190.79${\pm}$17.08 $\mu\textrm{m}$ in 43 days and 281.85${\pm}$23.81 $\mu\textrm{m}$ in 63 days after hatching. Growth of otoliths were similar to the growth pattern in total length during 20-63 days after hatching. Hatch mark was distinguished with other growth increments and within a hatch mark two or three increments were observed. The number of growth increments was correlated with the days after hatching between 20 and 63 days after hatching.

실험실에서 황복을 부화 후 1일에서 63일까지 사육하면서 표본을 추출하여 황복의 초기성장과 이석의 미세구조 관찰하였다. 부화 당시 황복의 전장은 3.09$\pm$0.02 mm였으며, 부화 후 10일에 전장 4.96$\pm$0.24 mm, 20일에는 5.39$\pm$0.42 mm, 30일에는 9.13$\pm$0.59 mm로 성장하였고, 부화 후 34일에는 평균 10.78$\pm$0.96 mm로 성장하였으며, 부화 후 43일에는 16.40$\pm$2.31 mm, 부화 후 63일에는 30.49$\pm$1.53 mm로 성장하였다. 부화한 황복 이석의 평균 장반경은 14.20$\pm$1.21 $\mu\textrm{m}$였고, 부화 후 10일째는 31.06$\pm$2.31 $\mu\textrm{m}$, 20일째는 57.19$\pm$6.19 $\mu\textrm{m}$, 34일째는 127.13$\pm$13.13 $\mu\textrm{m}$, 43일째는 190.79$\pm$17.08 $\mu\textrm{m}$, 63일째는 281.85$\pm$23.81 $\mu\textrm{m}$로 부화 후 20일 이후의 이석의 크기변화는 체장의 성장 경향과 유사하였다 황복의 이석에는 다른 성장선들과 구별되는 부화정지선이 형성되어있으며, 부화정지선 형성이전에 2-3개의 미세성장선이 관찰되었다. 부화 후 20일부터 63일까지, 황복의 이석에 형성된 일일성장선의 수와 경과한 일수는 1차 비례관계를 보였으며, 하루에 한 개씩 형성되어지는 것이 확인되었다.

Keywords

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