수온 및 광주기 조절에 의한 돌돔, Oplegnathus fasciatus의 산란 유도 Induced Spawning of Striped Knife-Jaw, Oplegnathus fasciatus by Manipulating Water Temperature and Photoperiod원문보기
돌돔의 수정란을 조기에 생산하기 위하여 수온과 광주기 조절에 의한 산란을 유도하였다. 실험 I에서는 12월 15일 수온 14.5$^{\circ}C$에서 2월 22일 $21.0^{\circ}C$로 증가시키고 광주기도 10 : 30 L에서 2월 17일 15 : 30 L로 증가시킨 결과 65일 만에 산란이 시작되었으며 총 산란기간은 40일간 이었다. 총산란량은 3,004.4만개, 부상란 수는 2,454.2만개로 부상률은 85.6%이며, 평균 수정률은 77.2%였다. 실험 II에서는 수온만을 실험 I과 같이 상승시킨 결과 산란이 이루어지지 않아 광주기를 15 ; 30 L로 조절한 지 7일만에 산란이 이루어졌으며, 총 산란기간은 40일, 총산란량은 2,128만개, 부상란수는 1,862만개, 평균 수정률은 72.1%였다.
돌돔의 수정란을 조기에 생산하기 위하여 수온과 광주기 조절에 의한 산란을 유도하였다. 실험 I에서는 12월 15일 수온 14.5$^{\circ}C$에서 2월 22일 $21.0^{\circ}C$로 증가시키고 광주기도 10 : 30 L에서 2월 17일 15 : 30 L로 증가시킨 결과 65일 만에 산란이 시작되었으며 총 산란기간은 40일간 이었다. 총산란량은 3,004.4만개, 부상란 수는 2,454.2만개로 부상률은 85.6%이며, 평균 수정률은 77.2%였다. 실험 II에서는 수온만을 실험 I과 같이 상승시킨 결과 산란이 이루어지지 않아 광주기를 15 ; 30 L로 조절한 지 7일만에 산란이 이루어졌으며, 총 산란기간은 40일, 총산란량은 2,128만개, 부상란수는 1,862만개, 평균 수정률은 72.1%였다.
Spawning inducement of striped knife-jaw, Oplegnathus fasciathus, was attempted by two experiments. In experiment I (Exp. I), water temperature was gradually increased from 14.5$^{\circ}C$ in December 15, 1996 to $21.0^{\circ}C.$ in February 22, `997 and then maintained at this...
Spawning inducement of striped knife-jaw, Oplegnathus fasciathus, was attempted by two experiments. In experiment I (Exp. I), water temperature was gradually increased from 14.5$^{\circ}C$ in December 15, 1996 to $21.0^{\circ}C.$ in February 22, `997 and then maintained at this level. Photo-period was also gradually increased from 10.5L/13.5D in December 15, 1996 to 15.5L/8.5D in February 17, 1997, and then maintained at this level. In experiment II (Exp. II), water temperature was increased in the same way from Exp. I. Photoperiod was natural conditions from December 1996 to March 9, 1997, and then suddenly increased to 15.5L/8.5D until the end of experimental period. Spawning of the fish was occurred from February 22 through April 2, 1997 (for 40 days) in Exp. I. Number of total spawned eggs was 30.04 million and fertilization rate was 77.2%. The fish began to spawn at $21.0^{\circ}C.$ and 15.5L/8.5D. It requied 65 days to spawn since the water temperature had increased from $14.5^{\circ}C.$ to $21.0^{\circ}C.$. Spawning of the fish was not occurred until March 9, 1997 in Exp. II. After 7 days, photo-period was suddenly incresed to 15.5L/8.5D and fish were spawned from March 17 through April 4, 1997 (for 20 days). Number of total spawned eggs was 21.28 million and fertilization rate was 72.1%. The fish began to spawn at $21.0^{\circ}C$ and 15.5L/8.5D. It required 65 days to spawning since the water temperature had increased from $14.5^{\circ}C$ to $21.0^{\circ}C$.
Spawning inducement of striped knife-jaw, Oplegnathus fasciathus, was attempted by two experiments. In experiment I (Exp. I), water temperature was gradually increased from 14.5$^{\circ}C$ in December 15, 1996 to $21.0^{\circ}C.$ in February 22, `997 and then maintained at this level. Photo-period was also gradually increased from 10.5L/13.5D in December 15, 1996 to 15.5L/8.5D in February 17, 1997, and then maintained at this level. In experiment II (Exp. II), water temperature was increased in the same way from Exp. I. Photoperiod was natural conditions from December 1996 to March 9, 1997, and then suddenly increased to 15.5L/8.5D until the end of experimental period. Spawning of the fish was occurred from February 22 through April 2, 1997 (for 40 days) in Exp. I. Number of total spawned eggs was 30.04 million and fertilization rate was 77.2%. The fish began to spawn at $21.0^{\circ}C.$ and 15.5L/8.5D. It requied 65 days to spawn since the water temperature had increased from $14.5^{\circ}C.$ to $21.0^{\circ}C.$. Spawning of the fish was not occurred until March 9, 1997 in Exp. II. After 7 days, photo-period was suddenly incresed to 15.5L/8.5D and fish were spawned from March 17 through April 4, 1997 (for 20 days). Number of total spawned eggs was 21.28 million and fertilization rate was 72.1%. The fish began to spawn at $21.0^{\circ}C$ and 15.5L/8.5D. It required 65 days to spawning since the water temperature had increased from $14.5^{\circ}C$ to $21.0^{\circ}C$.
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