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Effect of Recombinant Bovine Somatotropin on Growth of Olive Flounder, Paralichthys of olivaceus
Rho, Sum-Rho,Kim, Pil-Youn,Lee, Young-Don,Choi, Kwang-Sik,Song, Choon-Bok The Korean Society of Fisheries and Aquatic Scienc 1999 韓國養殖學會誌 Vol.12 No.2
The recombinant bovine somatotropin (rBST) was administered to the oliver flounder, Paralichthys olivaceus, to know the effects and optimal administration frequency and dosage of the hormone. The experiment was conducted with three different treatment groups (A, B and C) designated based on the duration and administration frequency of rBST and one control (D) from April 14, 1996 to March 16, 1997. The fish of hormone treated groups grew 7.86 to 10.07% (47.45 to 60.75 g in weight) better than the control at the end of the experiment (P<0.05). No significant differences in their growth were detected among treatment groups. The distinct growth improvement was recognized four weeks after completion of the first four hormone administration. When considering water temperatures measured from the experimental tanks, the effect of rBST on the flounder was greater during the period showing relatively lower temperature. The survival rates were higher in treatment groups than in the control, revealing 98.3% (A), 98.4% (B), 97.7% (C) and 93.1% (D) during the first stage of culture; 92.7% (A), 91.3% (B), 86.7% (C) and 80.0% (D) during the second stage of culture.
꽃게, Partunus trituberculatus 유생의 가스병 발생에 미치는 산소포화도 및 pH 의 영향
노섬(Sum Rho),강주찬(Ju Chan Kang) 한국어병학회 1995 한국어병학회지 Vol.8 No.2
In order to examine the effects of O2 saturation and pH on gas-bubble disease of blue crab, portunus trituberculatus, zoeal larvae were reared under 5 different concentrations (6.0, 4.0, 3.1, 2.2, and 0.7million cell/cc) of Chlamydomones sp. under natural light for 4days. Observed pH and O2 saturation in the rearing chamber increased drastically from 12 to 18 o`clock with the increasing of Chlamydomones sp. concentrations, but rapidly decreased from 2 to 6 o`clock in the rearing chamber. Gas-bubble disease of zoeal larvae was observed 4hours after starting of experiment at the pH 8.5 and 118% O2 saturated conditions in rearing chamber during the day, and recovered rapidly with the decreasing of pH and O2 saturation at night. Thus, gas-bubble disease of zoeal larvae was repeated with the increased pH(≥8.5) and O2 saturation (≥118%) almost every days. Mortality of zoeal larvae was observed when pH and O2 saturations were reached 8.5 and 118% levels respectively, and deteriorated with the increasing of water temperature, pH and O2 saturation.
盧暹 濟州大學校海洋硏究所 1991 해양과환경연구소 연구논문집 Vol.15 No.-
참전복, Haloitis discus hannai Ino, 浮游幻生의 빛에 대한 반응과 상층에 低鹽分濃度의 成層이 있을때 유생의 浮上에 미치는 영향을 밝히기위한 기초적인 시험을 해면과 실험실에서 실시한 결과는 다음과 같다. 참전복 trochophore 幻生과 孵化後 72시간내의 veliger 유생의 유리실험관속에서의 垂直分布는 빛의 조건과 關係없이 80-90%의 유생의 표층에 群集하였다. 참전복의 부유유생기의 負의 走地性은 유리관 내에서는 底양基로 移行하는 孵化後 72∼90시간부터 소실되기 시작하였다. 浮游幻生의 表層에 群集하려는 負의 走地性에 影響을 주는 上層部의 底 分海水濃度는 유생의 發生段階에 따라 차이가 나타났다. trochophore유생에서는 24.5‰, 孵化後 24-48시간사이의 veliger 유생에서는 30.01‰에서부터 성층을 경계로 兩分되는 경향을 보였으나 72시간째의 veliger 유생은 하층 高 分層의 表層경계면에 群集하는 傾向이 强해졌다. The effects of light and sea water of reduced salinity on vertical distribution of swimming larvae of an abalone, Haliotis discus hannai, were studied in sea and laboratory experiments. Trochophores and veligers were negative geotaxis, and most of them were swarming on the surface without showing phototactic reaction. Veligers lost negative geotactic behavior after 72-90 hours from hatching. Low salimity water on the suface retard surface swarming of the larve. Compared to veligers trochophores were more tolerable to the low salinity. The salinity with affects the geotactic behavior was 24.5‰ and 30.01‰in trochophore veligers respectively.