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Temperature Dependent of Mitotic Interval for Grass Puffer, Takifugu niphobles

  • Ko, Min Gyun (Dept. of Fisheries Biology Center for Risk Assessment of Oceans and Fisheries Living Modified Organisms, Pukyong National University) ;
  • Lee, Hyo Bin (Dept. of Fisheries Biology Center for Risk Assessment of Oceans and Fisheries Living Modified Organisms, Pukyong National University) ;
  • Gil, Hyun Woo (Bio-Monitoring Center) ;
  • Kang, Shin Beom (Dept. of Ocean Physical Education, College of Ocean Science and Technology, Korea Maritime and Ocean University) ;
  • Park, In-Seok (Division of Marine Bioscience, College of Ocean Science and Technology, Korea Maritime and Ocean University) ;
  • Kim, Dong Soo (Dept. of Marine Bio-Materials & Aquaculture, Pukyong National University)
  • Received : 2018.01.11
  • Accepted : 2018.03.25
  • Published : 2018.03.31

Abstract

The objective of this study was to determine the mitotic intervals (${\tau}_0$) of two consecutive cell divisions and synchronous embryonic cleavage in grass puffer, Takifugu niphobles at different water temperatures (18, 20, 22, and $24^{\circ}C$). The color of the fertilized egg was light yellowish. The egg type was demersal and unadhesive. Egg weight was $0.09{\pm}0.002mg$. The sizes of unfertilized eggs were smaller than fertilized eggs in major axis and minor axis at $20^{\circ}C$ (p<0.05). The size of the fertilized egg of $18^{\circ}C$ water temperature group at the blastodisc stage was the smallest (p<0.05), but no significant differences were observed in the other water temperatures group except $18^{\circ}C$ water temperature group (p>0.05). The first cleavage stages at 18, 20, 22, and $24^{\circ}C$ were at 75, 90, 105, and 120 mins, respectively. As water temperature was increased, embryonic development and formation time of the first cleavage furrow were accelerated. There were negative correlation between ${\tau}_0$ and water temperature for grass puffer (Y=-1.225X+70.05, $R^2=0.988$, n=10, where Y was ${\tau}_0$ and X was temperature). This study confirmed that successful hatching of grass puffer was related to water temperature. Chromosome manipulation will be helpful for this species using cleavage frequency and ${\tau}_0$.

Keywords

References

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