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참돔 (Pagurus major) 치어용 사료에 있어서의 대두박의 이용성과 적정 단백질${\cdot}$에너지 함량
정관식,JEONG Kwan-Sik 한국양식학회 1992 韓國養殖學會誌 Vol.5 No.1
참돔 치어에 있어서의 식물성단백질원의 이용성의 검토와 유효이용을 꾀하기 위하여, 대두박 및 콘글루텐 밀을 배합한 여러 종류의 실험사료를 제작하여 성장, 사료효율 및 어체성분에 미치는 영향을 조사하였다. 그 결과 사료중의 조단백질 및 조지폐함량이 각각 $47{\%}\;,20{\%}$ 구에서 뛰어난 성장 및 사료효율을 나타내었으며, 어분의 $20{\%}$를 대두박으로 대체하여도 성장 및 사료효율에는 아무튼 간제가 없는 것으로 판단되었다. 그리고, 원료대두박의 Ex 처리유무 및 사료의 제조법의 차이에 의한 영양가개선을 인정할 수 없었다. To test the availability of soybean meal as a protein source and to increase its effectiveness in the diets for the fingerlings of red seabream, some feeding trials were conducted. Two different types of diet, steam pellet and soft dry pellet, contained various levels of soybean meal, were used. The growth, feed efficiencies, and body compositions were examined after the feeding trials. Results of the experiments suggested that dietary protein level could be reduced from $52{\%}$ to $47{\%}$ by elevating dietary energy level from $13{\%}$ to $21{\%}$ with lipid. The best results of growth and feed efficiencies were achieved by the diet that containing $47{\%}$ of crude protein and $20{\%}$ of crude lipids. The growths and feed efficiencies showed no difference when $20{\%}$ of fish meal in the experimental diet were substituted by soybean meal. Therefore, $20{\%}$ of fish meal could be substituted by soybean meal without reducing growth rates or feed efficiencies of fingerling red sea bream.
넙치용 고효율 습사료 개발의 관한 연구 Ⅱ. 시판분말배합사료의 이용성 평가
정관식(Kwan Sik JEONG),지승철(Seung Cheol JI) 전남대학교 수산과학연구소 1998 수산과학연구소논문집 Vol.7 No.-
The feeding trials were conducted to investigate availability of five different commercial compound meal (CCM) supplemented to a moist pellet (MP) containing raw fish used in practical aquaculture places; qualities of different CCMs used commely in present mariculture were evaluated through these feeding trials. The 9-week feeding trial was conducted to investigate the effects of MPs containing five different CCMs for flounder on growth and body composition of fish. The 19g juvenile flounder grew to 72.1~87.8g after 9-week. Percent weight gain of fish fed various CCM MPs ranged from 281.5% to 357.3%; The MP containing CCM of A Co. produced significantly greater weight gain than the other diet (B, C, D and E Co.). Feed efficiency values were highest (81.1%) in the MP containing CCM of A Co. and followed by the MP (79.4%) containing CCM of B Co. and then, MPs (67.6~72.5%) from the other company. In total feed comsumption, fish fed MPs containing CCM of A Co. had also the greatest consumption; therefore, the CCM of A Co. considered as having a remarkable feed attractability. According to the result of this study, the CCM of A Co. produced greater weight gain, feed efficiency and feed consumption than the other company’s CCMs.
넙치용 고효율 습사료 개발에 관한 연구 Ⅰ. 생사료 원료별 이용성 평가
정관식(Kwan Sik JEONG),지승철(Seung Cheol JI) 전남대학교 수산과학연구소 1998 수산과학연구소논문집 Vol.7 No.-
The frozen raw fish diet used in Moist pellet (MP) mainly derived from most available fishes like sardine, mackerel, horse mackerel, anchovy and convenias. In this experiment, the quality of these fishes were compared. 9-week feeding trials were conducted to investigate the effect of dietary five frozen raw fishes as ingredients of FRFDs on growth and feed efficiency of flounder. Percent weight gain of flounder fed the MPs containing horse mackerel and convenias had highest and lowest value, respectively. And also, MPs containing horse mackerel produced significantly greater feed efficiency than MPs containing raw fish from convenias : MP with convenias produced significantly lowest feed efficiency in flounder. According to the growth results in flounder, MPs containing the horse mackerel and mackerel produced higher weight gain and feed efficiency; therfore, horse mackerel and mackerel revealed superior ingredients as FRFDs with high availability. However, the other fish species also produced no significantly reduced growth. Before we select a ingredient of FRRD just with a growth result, we should also consider the other aspects like a self-pollution problem from a FRFD; because extracts from anchovy and sardine normally polluted around aquaculture places, there fish species carefully should be used in aquaculture.
넙치 변태기에 있어 저수온 스트레스가 갑상선 호르몬과 백화현상에 미치는 영향
유진형 ( Jin Hyung Yoo ),정관식 ( Kwan Sik Jeong ),( Toshio Takeuchi ) 한국수산과학회 2003 한국수산과학회지 Vol.36 No.1
Flounder (Paralichthys olivaceus) fish goes through metamorphosis in the larvae phase. In this phase, it secretes much thyroid hormone to control metamorphosis. Sharp change in the environment and nutrition deflciency may cause stress in the metamorphosis phase. It leads to interfering with the development of thyroid hormone and finally inhibits the normal growth of larvae. In this study, the correlation between the change in thyroid hormones and the albinism appearance was examined by growing them with low temperature (13˚C) stress over the premetamorphosis stages (stage D~F) of flounder metamorphosis. Albumin rate was 51% in the low temperature groups and 25% in the control group. T_4 and T_3 of the control group tended to increase from stage F as larvae grew. T_4 increased 2 times compared to the control group as 72 ng/g at stage H, the increasing phase of water temperature, in the low temperature group. T_3 increased 8 times compared to the control group as 2.9 ng/g at stage E, the decreasing phase of water temperature, Therefore, it is judged that the albinism appearance of flounder is caused from the sharp increase in T_3 by the imappropriate secretion of thyroid hormone.
점농어, Lateolabrax sp. 소화관의 내부 형태 및 조직화학적 특징
이정식(Jung Sick LEE),정관식(Kwan Sik JEONG),허성회(Sung Hoi HUH) 전남대학교 수산과학연구소 1998 수산과학연구소논문집 Vol.7 No.-
The digestive tract of the spotted sea bass, Lateolabrax sp. composed of esophagus, stomach, intestine and seventeen or eighteen pyloric caeca. The relative length of gut (RLG), that is length of digestive tract to standard length, is 0.79 (n=10). Esophagus have a undeveloped submucosa and well developed muscularis mucosae. In the stomach, muscularis consists of longitudinal and circular muscle layer, and submucosa and muscularis mucosae are well developed. In the body stomach, microvilli are observed in the epithelial layer. Mucosal epithelium of the pyloric caeca and intestine composed of columnar epithelium with developed microvilli in the apical portion. Intestine have a advanced striated border and more abundant goblet cells than the pyloric caeca. Intestine is divided into the anterior, mid and posterior part by the external and histological features. The anterior intestine have a more abundant goblet cells than the other part of the intestine. The mid intestine have a advanced submucosa and more abundant absorptive cells than the other part of the intestine. And the posterior intestine have a advanced mucosal folds and muscularis.