• 수산경영론집
• /
• 제42권2호
• /
• pp.85-96
• /
• 2011

Oliver flounder population density affect Oliver flounder growth and mortality rate. In laboratory pilot experiment, Oliver flounder growth rate is inversely proportional to stocking density. But previous study has not proved external validity. This study is aimed to analyze the effect of stocking density on the Oliver flounder culture farms in Jeju Island. In order to do this, I selected 13 farms in Jeju island as a sample. In the study, various analytical methods including productivity analysis, regression analysis, statistical analysis were conducted for 13 Oliver flounder culture farms. The result of analysis can be summarized as follows. First, in case of the Oliver flounder culture farms, Bertalanffy equation is not applicable to the Oliver flounder growth. Second, the Oliver flounder stocking density, defined as the surface area of Oliver flounder per $m^2$ of water surface area, is preferred to density definition defined as the weight of Oliver flounder per $m^2$ of water surface area on the Oliver Flounder Culture Farms case. Third, growth rate and production weight on the Oliver flounder culture farms are inversely proportional to stocking density on spearman rank correlation test. When extensive comparable biological and culture condition data become available, analysis model can be easily modified to yield more accurate results.

• 수산경영론집
• /
• 제42권3호
• /
• pp.79-93
• /
• 2011

Water temperature of Oliver flounder farm affects Oliver flounder growth and mortality rate. In laboratory experimental tanks, optimal water temperature was $22.5^{\circ}C$($21{\sim}24^{\circ}C$) and cultivatable water temperature was $12{\sim}28^{\circ}C$. The purpose of this study is to identify applicable and useful water temperature of Oliver flounder farm in case of actual farming. The data applied in the analysis was collected from Jeju island. In the study, various analytical methods including productivity analysis, regression analysis, statistical analysis were conducted for 13 Oliver flounder culture farms. The result of analysis can be summarized as follows : First, growth rate on the Oliver flounder culture farms was related to mean of water temperature, variation of water temperature and low water temperature. Second, survival rate on the Oliver flounder culture farms was related to mean of water temperature. In case of including Oliver flounder stocking density, defined as the surface area of Oliver flounder per $m^2$ of water surface area, survival rate strongly related to mean of water temperature, variation of water temperature, cultivating capability and stocking density. Third, production weight per $m^2$ of water surface area was strongly related to mean of water temperature, low water temperature and cultivating capability. Growth rate and survival rate was analyzed into mediate variable character.

• 수산경영론집
• /
• 제41권1호
• /
• pp.113-128
• /
• 2010

This study is aimed to analyze the economic feasibility of the selective breeding program on the Oliver flounder aquaculture. First of all, in order to evaluate this program, we review the concept and research trend on the selective breeding. The objective of this research is the selective breeding program on the Oliver flounder aquaculture in the Genetics and Breeding Research Center, NFRDI. It was conducted to investigated economic effects of three factors of the selective breeding program on the Oliver flounder aquaculture such as fast growth, disease resistance and increase exports. The results of economic analysis of the selective breeding program on the Oliver flounder aquaculture are as follows; First, there were the significant meaning of the economic effects on the technology of the selective breeding program by fast growth, disease resistance and increase exports. Second, we analyzed in the economic feasibility of the selective breeding program on the Oliver flounder aquaculture from 2004 to 2020, internal rate of return(IRR) was 419%, a benefit-cost ratio was shown to be 24.92, net present value(NPV) was 989,942,464 thousand won, which indicates the economic feasibility of the selective breeding program is very high. Finally, in order to improve the economic feasibility, there is need to be focused on the efficient the selective breeding program on the Oliver flounder aquaculture.

• 수산경영론집
• /
• 제52권1호
• /
• pp.47-63
• /
• 2021

The purpose of this study is to identify the leading price between Jeju and Wando's oliver flounder producer price and to analyze the dynamic effect of the regional producer price using the panel VAR model. In the process of analysis, it was confirmed that there are unit roots in the monthly data of Jeju and Wando's oliver flounder producer price. So, in order to avoid spurious regression, the rate change of producer price which carries out log difference was used in the analysis. As a result of the analysis, first, the panel Granger causality test showed that the influence of the change rate of producer price in oliver flounder in Jeju was slightly larger than that in Wando, but it was found that each region all leads the change rate of the producer price in oliver flounder. Second, the panel VAR estimation showed that the rate change of producer price in Jeju and Wando a month ago had a statistically significant effect on the change rate of producer price of each region. Third, the impulse response analysis indicated that other regions are affected a little more than the same region in case of the occurrence of the impact on the error terms of the change rate of produce price in Jeju and Wando oliver flounder. Fourth, the variance decomposition analysis showed that the change rate of producer price in the two regions was higher explained by Jeju compared to Wando. In conclusion, it is expected that the above results can not only be useful as basic data for the stabilization of oliver flounder producer price and the establishment of policies for easing volatility but can also help the oliver flounder industry operate its business.

• Environmental Analysis Health and Toxicology
• /
• 제17권3호
• /
• pp.219-224
• /
• 2002

This study was carried out to examine the effects of bis (tribytyltin)oxide (TBT), endocrine disrupting compounds (EDCs). on the changes of survival, growth and oxygen consumption rate in the oliver flounder, Paralichthys olivaceus. Oliver Flounders were exposed to sublethal concentration of TBT (0, 1.67, 3.20, 6.30 and 12.50 $\mu\textrm{g}$/L) during 6 weeks. Survival rate was decreased in a concentration and exposure period-dependent way and suddenly the reduction of more than 20% occurred at TBT concentration greater than 3.20 $\mu\textrm{g}$/L. after exposure 6 weeks. Growth rate and feed efficiency significantly decreased at concentration greater than 3.20 $\mu\textrm{g}$/L. Oxygen consumption rate was also decreased in a concentration-dependent way and significantly decreased to 17,48 and 67％ than that of the control at the TBT concentration of 3.20, 6.32 and 12.50 $\mu\textrm{g}$/L, respectively. This study revealed that high TBT concentration ($\geq$3.20 $\mu\textrm{g}$/L) reduced growth and oxygen consumption rates of the juvenile oliver flounder suggesting potential influence on the natural mortality of Paralichthys olivaceus in the coastal areas.

• 한국어병학회지
• /
• 제19권3호
• /
• pp.235-241
• /
• 2006

The effects of various temperature shifts on the kinetics of the humoral antibody response in oliver flounder, Paralichthys olivaceus, immunised with formalin-killed Edwardsiella tarda, were determined by measuring the antibody production in vivo and in vitro. When fish acclimated to a high temperature and immunised at that temperature were transferred to a lower temperature (22℃ to 12℃) at a various times after immunisation, the fish showed a weaker immune response than that achieved when the fish were kept at a high environmental temperature. However, in the converse experiment (12℃ to 22℃), the magnitude of the humoral immune response was recovered independent of the time of the transfer after immunisation at low temperature, even though the peak levels of each transferred group did not reach the level found in the positive control group that was maintained and immunised at a high environmental temperature. Hence, these studies provide some evidence that the potential for antibody production in B cells of oliver flounder immunized at high temperature is not impaired by subsequent exposure to low temperature.

• 수산경영론집
• /
• 제40권3호
• /
• pp.189-205
• /
• 2009

This study is aimed to analyze the economic feasibility comparison of the extruded pellets and moist pellets on the Oliver flounder culture farms in Jeju Island. In order to do this, we selected 2 farms (M and S farms) in Jeju Island as a sample. In the study, various analyses including productivity analysis, cost structure analysis, profitability and economic feasibility analysis by feed type were conducted for two sample farms of Oliver flounder culture. The results of economic analysis by feed type on the Oliver flounder culture can be summarized as follows; First, there were not significant differences in productivity by feed type. Second, results of the profitability analysis on farm M by feed type showed the profitability was estimated to be 15.52% and 9.83% in EP and MP, respectively. In addition, the profitability of farm S was estimated to be 28.37% and 33.72% in EP and MP, respectively. Third, results of the economic analysis on farm M by feed type indicated that an internal rate of return(IRR) was 8% and 7% and a benefit-cost ratio was shown to be 1.64 and 1.11 in EP and MP, respectively. Furthermore, the economic analysis of farm M by feed type showed that an IRR was 19% and 24% and a benefit-cost ratio was calculated to be 1.4 and 1.51 in EP and MP, respectively. In summary, it is especially emphasized that economic valuation is not related to feed types (EP and MP). Finally, in order to improve the economic feasibility, it should be more focused on the efficient business management of the Oliver flounder aquaculture.

• 대한수의학회지
• /
• 제47권3호
• /
• pp.299-302
• /
• 2007

Neoheterobothrium hirame (N. hirame) is a large blood-feed gill-worm infecting the highly prized olive flounder. The present study was reported the occurrence and elimination of Neoheterobothrium infection from young cultured oliver flounder in the western coast of Korea. Flounder (weight 18-25 g, length 10-15 cm) were obtained from a cultured farm at Taean of Korea at May 2006. A lot of flounder died with serious anemia. We isolated N. hirame from the buccal cavity wall of dead flounder. Adult parasites were 5-15 mm in total length, with 4 pairs of clamps on the pedunculated haptor and isthmus region embedded in host tissue, while immature and sub-adults were identified the attachment to the gill filaments, rakers and arches with the clamps. All fish with infection were treated with 8% NaCl-supplemented seawater for 1 and 10 min at $22^{\circ}C$, respectively. The significant reduction in mortality (6.7%) was observed among fish treated with 8% salt water for 10 minutes, when compared with that of non-treatment group (100%).

• 환경생물
• /
• 제31권4호
• /
• pp.353-361
• /
• 2013

해양에서 이산화탄소 증가에 따른 해양산성화가 넙치치어의 성장에 미치는 영향을 조사하기 위하여 현장 메조코즘 실험을 실시하였다. 동해 남부에 위치한 기장군 장안읍의 사질저질에서 실험군(이산화탄소 주입)과 대조군의 실험장비를 설치하여 43일 동안 총 447개체 (실험군 223개체, 대조군 224개체)를 대상으로 실시하였다. 실험군의 pH는 평균 $7.63{\pm}0.13$, 이산화탄소 ($fCO_2$)농도는 평균 $1660{\pm}540$ ${\mu}atm$로 2100년도에 예상되는 수준으로(IPCC 2007) 유지하였으며, 대조구는 현재 기장군 장안읍 해역의 해양환경으로 유지하였다. 실험기간동안 사망률은 실험군과 대조군 사이에서 큰 차이를 나타내지 않았고 시간이 지남에 따라 감소하는 경향을 나타내었다. 넙치치어의 체장과 체중은 대조군에서 더 큰 증가양상을 나타내어, 그 결과 대조군에서 더 큰 성장률(specific growth rate)을 보였다. 결론적으로 본 연구는 해양에서 이산화탄소 농도의 증가는 넙치 치어의 초기 성장에 영향을 줄 수 있는 가능성을 제시하였다.

• 임산에너지
• /
• 제23권2호
• /
• pp.34-43
• /
• 2004

목탄, 목초액 및 목초탄(목탄80/목초액20)의 사료첨가제로서의 이용 가능성을 도출하고자 국내 주요 양식어종인 넙치의 생장 및 체 조성에 미치는 영향을 조사하였다. 무첨가 대조구와 비교하여 목탄, 목초액 및 목초탄 모두 생장 개선효과를 보였다. 사료효율에 있어서는 대조구와 목탄, 목초탄 첨가구는 유의적인 차이가 없었으나, 목초액은 유의적으로 높은 수치를 나타내었다. 또한 혈액성상은 대조구보다 첨가구에서 모두 높았으며, 특히 목초탄 첨가구가 대조구보다 유의적으로 높아 건강한 어류를 생산하였다. 폐사율은 대조구가 가장 높았으며, 목초액 첨가구와 목초탄 첨가구가 가장 낮았다. 한편 회복 소요시간은 모든 첨가구가 대조구보다 빨랐으며, 목초탄 첨가구가 가장 빠른 회복율을 나타내었다. 따라서 목초탄 첨가구는 생장뿐만 아니라 넙치의 건강도와 활력에서 우수한 결과를 나타내어 넙치의 생장과 면역력의 개선을 위해서는 목초액과 목탄이 혼합된 목초탄 첨가가 적절할 것으로 사료된다.