• Parasites, Hosts and Diseases
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• v.35 no.3
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• pp.149-154
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• 1997

A storage mite, Tyrophcgus putrescentiae, is recently known to be widely distributed in Korea, being commonly found in house dust, and may, therefore, be allergenically important. The purpose of this study was to develop mass rearing techniques for supplying a large quantity of allergens. The laboratory mouse food powder gave the highest yield, showing 1,251.5-fold increase in number after 10 weeks, and the mixed powder of laboratory mouse food and yeast (1 : 1) also gave same level of the production (1.203 1-fold increase in week 10). Several different combinations of temperature and relative humidity conditions were compared, and the maximum propagation was obtained at $25^{\circ}C$ and 64% RH, showing 960-fold increase in number. When the same amount of culture media was used the size of the culture container did not significantly influence the quantitative yield of T. putrescentice mites.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.30 no.3
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• pp.349-354
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• 1997

Myotibrillar ATPase activity, thermostability and composition of muscle protein were investigated to elucidate biochemical properties regard with rearing period and sex of olive flounder. Myofibrillar ATPase activity of male olive flounder reared for 6, 12 and 20 months was stronger than that of female one. $Mg^{2+}\;(+Ca^{2+})-ATPase$ activity of both female and male fish decreased with the elapse of rearing period, and the activity of male was higher than that of female far beyond the rearing periods. The high correlationship between the weight gain and myofibrillar ATPase activity was observed. The thor mostability of male myofibrillar protein was higher than that of female. Subunit composition of the myofibrillar and sarcoplasmic protein did not show difference between the both sex of the fish.

• Journal of Marine Life Science
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• v.7 no.2
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• pp.213-220
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• 2022

This study was conducted to investigate the effect of environmental factors such as water temperature and rearing density on the survival and growth of Litopenaeus vannamei under low salinity conditions. Overall, in the higher water temperature, the higher survival rate comes out and in the lower rearing density, the higher the survival rate does. In a study on feed efficiency, weight gain (WG) increased significantly as water temperature increased, and weight gain according to rearing density significantly decreased as rearing density increased. The growth rate of L. vannamei was faster when the water temperature was higher (water temperature 31℃) under low salinity conditions. In addition, in the evaluation of the growth rate according to the rearing density, it was confirmed that the growth rate was accelerated at a low rearinging density. It is believed that the results of this study will be usefully applied to the determination of the optimal rearinging density and breeding water temperature of L. vannamei in low salinity condition.

• Journal of the Korea Organic Resources Recycling Association
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• v.15 no.4
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• pp.93-99
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• 2007

Vertical distribution of tiger worm(Eisenia fetida) population in the earthworm rearing bed was investigated with feeding paper mill sludge. More than 50% of larva and adult population of Eisenia fetida lived within the depth of 5 cm from the surface of rearing bed. And more than 96% of the population of larva, adult and cocoon lived within the depth of 20 cm. Percental vertical distribution of Eisenia fetida population in the rearing bed was not much influenced by the changes in the height of rearing bed or density of earthworm population.

• Journal of Aquaculture
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• v.10 no.2
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• pp.97-103
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• 1997

Larval growth of the oyster, Crassostrea nippona, was investigated at the different conditions such as water volume, depth of culture vessel and initiative feeding time at $23^{\circ}C$. As a result, morphological changes were occurred during the early larval growth. That is, shell length was higher than shell height at the time of D-shaped larvae. Later, the length became equal to the hight when their shell length reached $127\mum$and then shell height increased rapidly. Some of pediveliger larvae with the size of $360\mum\;in\;shell\;length\;and\;385\mum$ in shell height began to temporarily settle on the substrate after 18 days. The result also indicated that the depth of culture vessel turned out to be an important factor rather than water volume for the larval growth. The fist feeding time of oyster larvae appeared to be the first day after fertilization.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.23 no.4
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• pp.334-338
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• 1990

The approximate compositions and the taste compounds of tilapia, Oreochromis nitoticus, cultured in freshwater and seawater for six months, were analyzed. As for the approximate compositions, there were little differences in moisture and protein contents of tilapia cultured in seawater and freshwater, but somewhat higher lipids and ash than that cultured in freshwater. Also, no significant differences in the content of free amino acids, nucleoli-des, betaine, TMAO, and total creatinine were observed between both groups.

• The Korean Journal of Malacology
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• v.27 no.4
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• pp.323-330
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• 2011

We have developed a polyculture container which is preferable for rearing of abalones and sea cucumbers in East Sea. To test the rearing capacity of the polyculture container, 50, 75 and 100 sea cucumbers ranging from the body length of 7-9 cm were cultured in three containers including 500 abalones with the shell length of about 5 cm, respectively. It was revealed that preferable density for sea cucumbers was 52-72 individuals in the polyculture container. Glutamate oxaloacetate transaminase and glutamate pyruvate transaminase were analyzed with Reflotron kit to investigate the health degree of abalones in two polyculture containers including 300 and 500 abalones with the shell length of about 5 cm. Glutamate oxaloacetate transaminase has been an important tool to know myocardial infarction, disease of liver, and destruction of muscle. Next experiment was conducted to determine the effects on growth of abalones and sea cucumbers in polyculture container. Experimental findings, RNA/DHA ratio, DNA and RNA contents (ug/mg) were not significantly different among all groups. The results imply that the method of polyculture can be rearing with sea cucumber without growth retardation of abalone. Production ability between polyculture container and the container used in south sea were carried out using suspended culture method during 8months. It was revealed that abalones and sea cucumbers are faster growing in polyculture container than in container used in south sea. Therefore, polyculture container is considered more appropriate for the abalones and sea cucumbers culture in East Sea.

• Journal of the korean veterinary medical association
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• v.41 no.5
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• pp.433-438
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• 2005

최근 농림부에서는 축산물 위생 및 안전성을 확보하기 위하여 도축장, 우유 ${\cdot}$ 육가공장, 배합사료공장에 이어 사육단계에서도 HACCP(위해요소중점관리제도)도입을 단계적으로 추진하겠다고 발표한 바 있다. 특히 사육농장에서 안전한 축산물을 생산하는데 해로운 영향을 미칠 수 있는 각종 위해요소를 파악, 이를 사전에 차단하거나 중점 관리하는 사육단계의 HACCP를 2006년 돼지농장을 시작으로 2007년 젖소, 2008년 한육우, 2009년 산란계, 2010년 육계공장까지 단계적으로 확대 도입할 계획이다. 따라서 본 고에서는 최근 일본에서 제정한 가축의 생산단계인 농장에서의 위생관리지침서의 주요 내용을 소개하고자 한다

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1999.07a
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• pp.46-51
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• 1999

최근 우리나라의 젓소 및 한우의 사육두수는 계속 증가 추세에 있으며 젖소와 비육우는 1996년 현재 약 340만여 두가 사육되고 있다. 반면 사육농가는 계속 줄어들어 호당 사육두수가 꾸준히 증가하고 있음에도 북구하고, 아직은 축산 선진국에 비하여 규모가 영세한 탓에 많은 문제점을 안고 있으며, 그 중 조사료의 자급이 가장 큰 문제점으로 제기되고 있다. (중략)

• Journal of Sericultural and Entomological Science
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• v.34 no.2
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• pp.67-70
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• 1992

누에는 식식성 곤충중에서도 단식성 또는 협식성의 곤충으로 널리 알려져 오랜 세월동안 뽕잎만을 먹고살아 왔다. 이 누에를 뽕 이외의 식물로 사육해 보려는 시도는 꽤 오래 전부터 실시되어 누에가 먹고 어느 정도 성장할 수 있는 식물로는 구지뽕나무, 닥나무, 민들레, 왕고들빼기, 씀바귀 등 10여 종류가 넘게 보고되어 있다. 그러나 이들의 사육성적이나 얻어진 고치는 뽕을 먹여 사육한 성적과는 비교도 안 되는 현저히 뒤떨어지는 것이었고 실용적인 의미에서 뽕을 능가하는 식물은 찾아볼 수 없다.(중략)