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염화아연 (ZnCl2) 만성노출에 따른 북방전복, Haliotis discus hannai의 조직학적 지표 변화
손맹현,김병학,김수지,이정식 한국패류학회 2015 The Korean Journal of Malacology Vol.31 No.3
This study was conducted to find out concentration of trace metal, survival rate, falling rate and structural changes of abalone, Haliotis discus hannai exposed to zinc chloride. Experimental groups were composed of one control condition and four exposure conditions (0.3, 0.8, 1.3, 1.8 ZnCl2 mg/L). The accumulation of trace metal (zinc) in abalone was significantly increased all exposure group. Though the exposure groups had lower survival rate than the control group, higher falling rate than the control group. Histopathological changes in the foot, gill and hepatopancreas of abalone revealed obvious with exposure group than control group.
회전원판을 이용한 해수 순환여과 시스템에서 암모니아 부하율에 따른 암모니아 제거율
손맹현(Maeng Hyun Son),전임기(Im Gi Jeon),조기채(Kee Chae Cho),김광수(Kang Soo Kim) 한국수산과학회 2000 한국수산과학회지 Vol.33 No.4
A series of experiments was conducted to investigate the relationship between ammoia removal rates and ammonia loading rates in seawater filtering system using rotating biological contactor (RBC). In this experiment, RBC system was consisted of rotating polyvinyl film disks, which provided 12㎡ of total effective surface area in 0.075㎥ of volume. NH₄Cl was added by 10∼150g as a ammonia nitrogen source to determine ammonia removal rate in RBC system. Relationship between time required for ammonia removal (y: hour) and nitrogen inputted (x: NH₄-N ㎎/ℓ) in RBC system was as followed: y=3.51+7.76 lnx (r²=0.936). At ammonia concentration 2㎎/ℓ, it took 10 hours for removal of ammonia in the RBC system. However, at ammonia concentration of 5 and 16.5㎎/ℓ, it took 16 and 27 hours, respectively. There was a decreasing tencency of an increasing ammonia in the rearing water. Finally, the ammonia removal rate in the RBC system increased with the rise of total ammonia concentration up to 16.5㎎/ℓ.
손맹현 ( Son Maeng Hyeon ),전임기 ( Jeon Im Gi ) 한국수산과학회 2003 한국수산과학회지 Vol.36 No.5
N/A This study was to survey proper condition of nitrate removal by hydraulic retention time (HRT) and measured growth of black rockfish (Sebastes schlegeli) and giant croaker (Nibea japonica) in the seawater recirculating culture system designed for nitrate removal. Nitrate conversion to nitrogen at 8 hr-HRT was higher than 16 hr-HRT, amounting to 32.2 g/㎥/day in the seawater recirculating culture system. The removal efficiency of nitrate improved when dissolved oxygen was situated less than 0.5 mg/L. Daily growth rate (DGR) and feed efficiency (FE) of S. schlegeli with mean body weight of 108 g in 8 hr-HRT were significantly higher values than those in 4 hr-HRT (P<0.05). The DGR and FE of N. japonica with mean body weight of 12 g in added carbon system showed not differing in the values from N. japonica in control system (P>0.05).
조피볼락 해상가두리 양식업의 지역별, 규모별 경제성 분석
손맹현 ( Maeng Hyun Son ),박우민 ( Min Woo Park ),임한규 ( Han Kyu Lim ) 한국수산경영학회 2014 수산경영론집 Vol.45 No.1
This study is aimed to analyze the economic performance of black rockfish aquaculture by standardizing cost structures by region and farming size. The result of survey on farming and sale condition in each region, stocking density, survival rate, juvenile price, and unit production was the highest at Yeosu and Tongyeong, Heuksando showed the lowest. While rearing period was the longest at Tongyeong, the shortest region was Yeosu and Wando. In farming cost structure by region, amount of feeing was the highest at Tongyeong and Yeosu, and the lowest was Heuksando. Cost of medicine was high in Wando and Taean region, Yeosu and Hecksando was low. In case of farm size, feed cost ratio was high in the order of medium(0.75ha), small(0.25ha) and large(1.25ha) size. Standard production cost at every farm size of Heuksando showed the lowest among these regions. Taean and Yeosu was middle, and Tongyeong and Wando was the highest. According to the income, profit rate and investment return of farm size in all regions, as the bigger farm size, the higher income and profit rate was revealed. However, in case of Wando, Taean, and Heuksando which regions has high investment return, medium farm size was higher than large size. The result of economic analysis according to various factors, economic feasibility of black rockfish aquaculture in marine floating cage was showed significant changes by rearing and market condition.
손맹현 ( Maeng Hyun Son ),박민우 ( Min Woo Park ),김병학 ( Byeong Hak Kim ),이시우 ( Si Woo Lee ) 한국수산경영학회 2015 수산경영론집 Vol.46 No.1
This study is aimed comparative analysis for business performance of land-based ezo abalone (Haliotis discus hannai) seed farms by standardizing cost structures by region and farming size. The result of survey on average farming incomes by region showed that farming incomes in Haenam and Jindo regions were much higher than those in other regions. Followed by Wando region, incomes in other regions were analyzed to be relatively lower. It is shown that farming incomes became higher as farm size increased. Farming incomes per unit size which were modified from farming incomes by region were highest in Jindo region, followed by East sea region, Wando and Haenam regions. Incomes in Jeju and Yeosu regions were analyzed to be relatively lower. Results on farming incomes per unit size (m2) showed that both farming incomes and profits became higher as size increased. It implies that a scale effectiveness might exist in case of land-based abalone culture system. Impacts of major factors on farming profits and returns on investment in abalone seed aquaculture are summarized as follow. First, only if the survival rate increased by 10% with improvement of component ratio, variable effects became largest. In variable effects of other factors, a variation in Jindo region was largest and on the other hand, a variation in Yeosu region was shown to be smallest.