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      • 유수식 양식장에서 참전복, Haliotis discus hannai의 성장과 수질의 주야변동

        김은희(Eun Hee KIM),곽용구(Yong Gu KWAK),이범성(Bum Sung LEE),최성제(Sung Je CHOI),신종암(Jong Ahm SHIN) 전남대학교 수산과학연구소 1999 수산과학연구소논문집 Vol.8 No.-

        To offer the basic data for the effective rearing management of the ablone, Haliotis discus hannai, diurnal changes of water quality and growth of juvenile(mean initial shell length : 30 ㎜) and adult abalones(mean initial shell length : 60 ㎜) in the indoor running water culture system were studied from July 24th to December 24th, 1988. Growth rates of the juveniles and the adults during the experiment were 37.2 and 11.3%, the weight increments were 10.28 and 24.95 g, and the increase weight ratios 93.6 and 53.9%, respectively. Daily growth rates of the juveniles and the adults were 82.9 and 50.5 ㎛/day. Daily increase weight ratios of the juveniles and the adults were 66.8 and 162.0 ㎎/day. Relationship between shell length and rearing days in the juveniles and the adults were y=0.0992x + 32.641 and y=0.0637x + 67.462. The survival rates of the juveniles and the adults were 98.2 and 99.3%; the mortality was high in August and September when water temperature was high. The water temperature varied from 10.5 to 25.5℃ in the daytime and 8.4 to 25.3℃ in the nighttime during the experiments; the water temperature in both the daytime and nighttime was the highest early in August and in the nighttime the lowest in late December. The specific gravity varied form 1.0217 to 1.0258 in the daytime and 1.0218 to 1.0258 in the nighttime. The pH in the tank of the juvenile abalones and in tank of adult abalones changed from 7.87 to 8.41 and 7.95 to 8.52 in the daytime, and 7.98 to 8.36 and 8.07 to 8.37 in the nighttime, respectively. The dissolved oxygen in the tank of the juveniles and in the tank of the adults fluctuated from 5.76 to 7.52 ㎎/ℓ and 5.36 to 7.54 ㎎/ℓ in the daytime, and 5.40 to 7.46 ㎎/ℓ and 5.03 to 7.48 ㎎/ℓ in the nighttime; the dissolved oxygen in the daytime was higher than in the nighttime. the ammonia-nitrogen in the juvenile tank and in the daytime was higher than in the nighttime. The ammonia-nitrogen in the juvenile tank and in the adult tank varied from 0.455 to 5.280 ㎍-at/ℓ and 0.466 to 7.302 ㎍-at/ℓ in the daytime, and 0.435 to 4.861 ㎍-at/ℓ and 0.218 to 3.362 ㎍-at/ℓ in the nighttime. The nitrate-nitrogen in the juvenile tank and in the adult tank changed from 0.16 to 0.50 ㎍-at/ℓ and 0.22 to 0.76 ㎍-at/ℓ in the daytime, and from 0.14 to 0.39 ㎍-at/ℓ and 0.06 to 0.71 ㎍-at/ℓ in the nighttime. the nitrate-nitrogen in the juvenile tank and in the adult tank changed from 0.70 to 5.57 ㎍-at/ℓ and 0.80 to 6.53 ㎍-at/ℓ in the daytime, and from 0.63 to 7.22 ㎍-at/ℓ and 0.52 to 7.56 ㎍-at/ℓ in the nighttime. The phosphate-phosphorus in the juvenile tank and in the adult tank changed from 0.54 to 1.53 ㎍-at/ℓ and 0.30 to 1.32 ㎍-at/ℓ in the daytime, and from 0.17 to 1.82 ㎍-at/ℓ and 0.59 to 2.10 ㎍-at/ℓ in the nighttime. The silicate in the juvenile tank and in the adult tank varied from 12.79 to 14.87 ㎍-at/ℓ and 9.92 to 14.41 ㎍-at/ℓ in the daytime, and from 9.47 to 15.79 ㎍-at/ℓ and 9.18 to 17.36 ㎍-at/ℓ in the nighttime, respectively.

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