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THE PRESENT AND FUTURE OF MARINE-FISH CULTURE IN KOREA WITH EMPHASIS ON DIETARY REGIME
김규일 濟州大學校 農科大學 動物科學硏究所 1995 動物科學論叢 Vol.10 No.1
The present situation and future perspectives of marine-fish culture in Korea were discussed with emphasis on feeding systems. An increased living standard with industrialization over the last few decades has increased demands for highquality fish, and opened a door for a new industry, aquaculture that was considered to be the only alternative to Ocean fisheries production that was also decreasing over the same period. Flounder production through aquaculture has increased more than 20 times over the last five years. Fish farmers were not prepared technologically for the level of production and consumption did not follow the increased production. As a consequence, production costs remained high and market price for products decreased, and thus many farmers suffered in recent years. To improve marine-fish production and increase profit, we need to improve feed technology including larval feeding, search for a variety of culture species that are more suitable for our culture conditions, develop a new species by using recombinant-DNA technology and improve management and product-marketing systems. Demands for high-quality fish are expected to increase in the future. The only way to meet these increased demands is to increase production through aquaculture. Therefore, we should develop cost-effective marine finfish culture systems, e.g., reduced feed costs, preventive measures for diseases, low-cost facilities and their maintenance, etc.
알팔파 , 김 또는 솔잎 분말을 함유한 사료의 급여가 쥐의 성별 맹장 크기 , 맹장 요소분해 효소 활성 및 혈청 요소수준에 미치는 영향
김규일,이종언 한국축산학회 1997 한국축산학회지 Vol.39 No.4
A study was conducted to investigate the effect of feeding diets containing alfalfa, nori or pine-needle meal on cecal size and cecal unease activity in male and female rats. Six male and six female Sprague Dawley rats (initial mean weight, 92 g) were assigned to each of the following diets : a control diet or diets containing 10% alfalfa, nori or pine-needle meal. All the diets contained 5% corn oil and 5% lard. After a 4-week feeding period, rats were killed and cecal contents and blood samples were collected. Rats fed the control or nori meal diet had higher (P$lt;.01) average daily feed intake(ADFI) and average daily gain (ADG) and lower feed/gain ratio (F/G) than rats fed diets containing alfalfa and pineneedle meals. Male rats showed much higher (P$lt;.01) average daily gain, and lower (P$lt;.01) F/G than females. Ammonia concentration (μ㏖ ammonia per g collected contents) in the cecum (blank or before incubation) was higher (P$lt;.05) in the control than in the other groups. Urease activity in a g of cecal contents of rats fed diets containing nori or pine-needle meal was much lower (P$lt;.01) than that of rats fed the control or alfalfa meal diet, but was not different between sexes. However, total urease activity in the contents was not significantly different between the dietary treatments. Interestingly, male rats showed higher (P$lt;.01) total urease activity in the contents but lower (P$lt;.01) plasma urea concentration than did female rats. Results of our study indicated that dietary nori or pine-needle meal increases cecal size and decreases cecal urease activity perhaps due to soluble fiber present in the ingredients. The higher total urease activity in the cecal contents of male than that of female rats is interesting, but its mechanism is yet to be studied. The effect of sex on blood urea concentration is considered due to different amounts of protein intake per unit body weight.
김규일 한국영양사료학회 1985 韓國營養飼料學會誌 Vol.9 No.1
The minimum amount of dietary protein required to produce adequate growth of several fish species has been reported. The protein requirement of all species with the exception of channel catfish(32 to 36%) were reported to be greater than 40%. The requirement can vary, depending on species, sizes, feeding conditions and energy sources in the diet. For example, rainbow trout fed diets, which varied protein (casein supplemented with arginine and methionine, and 2% gelatin) at the expense of a mixture of dispensable amino acids, required approximately 24% protein for optimun growth. This result indicates that the total protein requirement of trout(40%) has two components: that required directly for protein synthesis(60%) and that needed for energy(40%). A single major component in most fish diets is fish meal. Because of the high price of fish meal, alternative protein sources have been searched. Same plant proteins and animal by-products can be used as partial substitutes for fish meal. However, much more research is needed to expand the use of alternative protein sources for fish diets.