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RISS 인기검색어
- 검색키워드
- 저자 : ( Sung Hwoan Cho ) (검색결과 172 건)
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Economic Analysis of Channel Catfish Production in Ponds
Cho, Sung Hwoan,Richard T . Lovell 한국수산학회 1998 Fisheries and Aquatic Sciences Vol.1 No.2
This study was designed to evaluate the economic analysis of channel catfish production in 1998 based on fish value and total feed cost. Catfish received higher protein feeds with lesser amount based on the dietary protein levels, but received the constant total protein input for all treatments. Weight gain per pond for treatment 1 (28% protein, 100% of satiation) was higher (P$lt;0.10) than for treatment 3 (36% protein, 77.8% of satiation), but not significantly higher than for treatment 2 (32% protein, 87.5% of satiation) at constant DE. At constant DE/P (treatments 4, 2 and 5), weight gain per pond for treatment 5 (36% protein, 77.8% of satiation) was lower (P$lt;0.10) than for treatment 2, but not significantly lower than for treatment 4 (28% protein, 100% of satiation). At constant DE, feed conversion slightly improved as dietary protein level increased from 28% to 32% and feed allowance decreased by 12.5%, but did not improve further as dietary protein level increased from 28% to 36% and feed allowance decreased by 22.2%. At constant DE/P, feed conversion improved as dietary protein level increased from 28% to 32% increased and feed allowance decreased by 12.5%, but did not improve as dietary protein level increased from 28% to 36% and feed allowance decreased by 22.2%. Total feed cost for treatment 1 was slightly, but not significantly higher than for treatments 2 and 3 at constant DE. At constant DE/P, total feed cost for treatment 5 was higher (P$lt;0.O5) than for treatment 2, but not significantly higher than for treatment 4. Total value of fish ($/ha) produced for treatment 1 was highest and lowest was for treatment 5. Return above feed cost was highest for treatment 1 and nearly the same as treatment 2. Return over feed cost for treatments 3 and 4 were slightly lower than for treatments 1 and 2. Economic analysis showed that feeding fish the diet containing 28% protein and 3.08 kcal/g DE to satiation and the diet containing 32% protein and 3.08 kcal/g DE to 87.5% of satiation produced the highest profit to farmer.
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Cho, Sung Hwoan 한국수산학회 1998 Fisheries and Aquatic Sciences Vol.1 No.2
This study was carried out to evaluate the effect of feeding higher protein feeds with lesser amount, but feeding the constant total protein input for all treatments, on water quality and nitrite toxicity in channel catfish ponds. There was no significant difference in survival rate among treatments (P$gt;0.05). Specific growth rate (SGR) for Treatment 1 (28% protein and 100% of satiation) was significantly higher (P$lt;0.05) than for Treatment 3 (36% protein and 87.5% of satiation), but not significantly higher than for Treatment 2 (32% protein and 77.8% of satiation) at constant digestible energy (DE), 3.08 ㎉/g (treatments 1, 2 and 3). At constant DE/P (treatments 4, 2 and 5), no significant difference in SGR was observed among treatments. Feed conversion ratio (FCR) slightly improved or improved as dietary protein level increased from 28% to 32 and feed allowance decreased by 12.5%, but did not improve as dietary protein level increased from 32% to 36% and feed allowance decreased by 22.2%, at constant DE and constant DE/P. There was no significant difference in water quality variables, such as total ammonia nitrogen (TAN), nitrite, chlorophyll a, soluble phosphorous concentrations among treatments, but significant difference in water quality variables over time as amount of feed fed increased (P$lt;0.0001). There was a trend toward increase in TAN and nitrite over time. A strong linear regression was observed between mean total ammonia nitrogen and nitrite for all treatments Y (Nitrite)=0.04 X (TAN)+0.01, R²=0.89. Methemoglobin percent in the blood of catifish was not significantly different among treatments. And its mean value was 7.5%, which was relatively low, so that it was not serious problem in catfish production pond under these experiment conditions. There was the stronger linear regression between the percentage of Methemoglobin and the molar ratio of nitrite to chloride rather than nitrite alone: Y (Methemoglobin %)=58.45 X (NO^(2-)/Cl^-)+0.41, R²=0.60. These results indicate that deterioration of water quality has no strong impact on poor weight gain for 36~ dietary protein in this study.
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Cho Sung Hwoan,Lee Sang-Min,Lee Sang-Mok,Park Bum-Hee,Park In-Seok,Choi Cheol Young,Min Byung Hee,Hur Sung-Bum,Jo Jae-Yoon The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.2
We evaluated the effects of the partial dietary replacement of fish meal with squid liver $Meal^{TM}$ on the growth and body composition of juvenile olive flounder Paralichthys olivaceus during the winter season. Twenty-five fish with an initial body weight of 23 g per tank were distributed among 12,250 L flow-through tanks. The experimental diets, which were designated SLM5, SLM1O, and SLM15 diets, were prepared in triplicate along with control diet by replacing 5, 10, and $15\%$ of mackerel fish meal with squid liver $Meal^{TM}$, respectively. The weight gain and specific growth rate of flounder that were fed the control and SLM5 diets did not differ from those of the fish fed the SLM10 diet, but they were significantly (P<0.05) higher than those of the fish fed the SLM15 diet. The feed efficiency ratios for the flounder that were fed the control, SLM5 and SLM10 diets were significantly (P<0.05) higher than for the fish that were fed the SLM15 diet. However, the protein efficiency ratio for the flounder was not significantly affected by the experimental diets. The crude protein, crude lipid and ash content, and blood chemistry of the flounder were not significantly affected by the experimental diets. Therefore, the replacement of up to $10\%$ of dietary fish meal with squid liver $Meal^{TM}$ can be made without a reduction in growth or a deterioration of the feed efficiency of juvenile olive flounder during the winter season.
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Cho, Sung-Hwoan The Korean Society of Fisheries and Aquatic Scienc 2009 Fisheries and Aquatic Sciences Vol.12 No.4
The effects of different feeding regimes on the compensatory growth of olive flounder Paralichthys olivaceus were investigated. Seven treatments with triplicates of different feeding regimes were conducted, as follows: (1) fed twice a day 6 days a week for 8 weeks; (2) starved for 1 week, then fed twice a day 6 days a week for 3 weeks; (3) starved for 2 weeks, then fed twice a day 6 days a week for 6 weeks; (4) starved for 5 days, then fed twice a day for 9 days; (5) starved for 10 days, then fed twice a day for 18 days; (6) starved for 2 days, then fed twice a day for 5 days, starved for another 3 days, and fed twice a day 4 days; and (7) starved for 4 days, then fed twice a day for 10 days, starved for another 6 days, and fed twice a day for 8 days. Forty fish averaging 12.5 g, were hand-fed to satiation according to the designated feeding schedule. Fish from the control group gained more weight than those from any other group. Feeding efficiency did not vary among treatments. In summary, olive flounder subjected to fasting with different feeding regimes did not fully compensate growth compared to fish fed for 8 weeks without fasting. In addition, the less that fasted groups were subsequently fed, the lower their compensatory growth.
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Cho, Sung-Hwoan,Lee, Sang-Min,Kwon, Mun-Gyeong The Korean Society of Fish Pathology 2010 한국어병학회지 Vol.23 No.3
Effects of various concentrations of garlic powder and garlic extract in the diets on growth, serum chemistry and immune response of olive flounder were determined. Thirty-five juvenile fish averaging 5.1 g were randomly distributed into 21 of 180 L flow-through tanks. Seven experimental diets with various concentrations of garlic powder (GP) and garlic extract (GE) were prepared in triplicate: GP-0 without garlic supplementation, GP-0.5, GP-1, GP-2, GP-3 and GP-5 diets containing garlic powder at the concentrations of 0.5, 1, 2, 3 and 5%, respectively at the expense of wheat flour and finally, GE-0.4 diet containing 0.4% garlic extract were prepared. At the end of the 8-week feeding trial, serum chemistry of fish was measured. In addition, twenty fish from each tank were artificially infected with E. tarda for the following 96 h to monitor cumulative mortality. Weight gain of fish fed GP-0 diet was higher than that of fish fed GP-1, GP-2, GP-3 and GP-5 diets. No difference in serum criteria (total protein, glucose, glutamate oxaloacetate transaminase, cholesterol and triglyceride levels) of olive flounder was found among the experimental diets except for glutamate pyruvate transaminase. Lysozyme activity of fish fed GP-0, GP-1, GP-3 and GE-0.4 diets was higher than that of fish fed GP-5 diet. The highest cumulative mortality was 93.3% in fish fed GP-0 diet at 96 h after E. tarda infection, followed by GP-3, GP-1, GP-5, GP-2, GP-0.5 and GE-0.4 diets. In considering these results, dietary inclusion of garlic powder and garlic extract has no distinctive positive effect on improvement in growth, serum chemistry and immune response of olive flounder in this experimental conditions, therefore, its application should be carefully considered.
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Cho Sung Hwoan,Lee Sang-Mok,Park Bum-Hee,Park In-Seok,Choi Cheol Young,Lee Sang-Min,Min Byung Hee,Hur Sung-Bum,Lim Young Soo The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.3
This study was conducted to investigate the effect of partially substituting meat meal for fish meal on the growth and body composition of juvenile olive flounder Paralichthys olivaceus during the winter season. Twenty-five fish (initial body weight, 23 g) were distributed into twelve 250 L flow-through tanks. Four experimental diets were prepared in triplicate: the control, MM20, MM40, and MM60 diets. Sixty percent mackerel meal was used as the primary protein source in the control diet. Meat meal was substituted for 20, 40, and 60$\%$ of the mackerel meal in the MM20, MM40, and MM60 diets, respectively. Survival was not significantly affected by the experimental diets. However, the weight gain and specific growth rate of fish fed the control, MM20, and MM40 diets were significantly higher than those of fish fed the MM60 diet (P<0.05). The feed efficiency ratio of fish fed the control, MM20, and MM40 diets was significantly higher than that of fish fed the MM60 diet (P<0.05). The protein efficiency ratio for fish fed the control diet was significantly higher than that for fish fed the MM40 and MM60 diets (P<p0.05). Moisture, crude protein, crude lipid, and ash content, and blood chemistry of the flounder at the end of the feeding trial were unaffected by the experimental diets. Considering these results, it can be concluded that up to 40$\%$ substitution of meat meal for fish meal in the diet could be implemented without a reduction in growth or deterioration of the feed efficiency of juvenile olive flounder during the winter season.
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Cho, Sung-Hwoan The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.3
The effects of alternate-week feeding strategies on growth and feed efficiency ratio of juvenile Nile tilapia were investigated in a recirculating aquaculture system. Twenty fish initially weighing 25.5 g were randomly distributed into each of 18 tanks to conduct three replicates for each of six different feeding strategies. Weight gain of fish in the control that were fed daily for 6-week feeding trial was significantly higher than those of fish subjected to various alternate-week feeding regimes. Weight gain of fish that were starved for 3 weeks and then fed daily for 3 weeks (3WS+3WF) was not significantly different from that of fish, starved and fed daily for alternate 1-week period during the trial (1WS+1WF), but was significantly higher than those of fish starved for 2 weeks, and fed for 2 weeks (2WS+2WF); fish starved for 4 weeks and fed for 2 weeks (4WS+2WF); and fish fed for 5 weeks and fed for 1 week (5WS+1WF.) The amount of feed supplied to fish in the groups of 1WS+1WF and 3WS+3WF was significantly lower than that fed to fish in the control group, but significantly higher than the amount feed supplied to fish in the other three groups. Feed efficiency ratio for fish in the control group did not differ from that for fish in the groups of 1WS+1WF, 2WS+2WF and 3WS+3WF, but was significantly higher than that for fish in the groups of 4WS+2WF and 5WS+1WF. In conclusion, juvenile Nile tilapia that were subject to starvation for 1 to 5 weeks did not exhibit compensatory growth sufficient to attain the same weight as fish fed daily for 6 weeks. In addition, fish subjected to starvation exhibited low feed efficiency ratio compared to fish fed daily, which were probably attributable to poor weight gain.
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( Sung Hwoan Cho ) 한국수산과학회(구 한국수산학회) 2010 Fisheries and Aquatic Sciences Vol.13 No.3
The effects of various natural antioxidant sources on oxidation of olive flounder (Paralichthys olivaceus) and fish diet during storage was determined. Juvenile fish were distributed among 18 flow-through tanks (40 fish per tank). Six experimental diets were prepared in triplicate: control (CT), antitox (AT), green tea extract (GE), fig extract (FE), Haeroc product (HP) and by-product of green tea (BG). The experimental diets were stored at two temperatures: room temperature (26.8℃) for 14 days and frozen (-30℃) for 16 weeks. Thirty fish were sampled from each tank at the end of the 8-week feeding trial. Whole bodies of fish were homogenized and stored in a home freezer (-9.6°C) for 24 weeks. Acid values (AVs) and peroxide values (POVs) of the diets and frozen fish during storage were monitored. AVs of the experimental diets tended to increase with the storage period except for that of the HP diet at room temperature. POVs from FE, CT, and BG diets peaked at day 7 and then decreased through the remainder of the experiment. AY s of the experimental diets and fish increased with time at -30℃ and -9.6℃. Results of this study show that by-products of green tea and Haeroc product seem to have potential as antioxidants in fish feed to inhibit oxidation of both the feed and fish during storage.
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Cho, Sung Hwoan The Korean Society of Fisheries and Aquatic Scienc 2013 Fisheries and Aquatic Sciences Vol.16 No.1
I hypothesized that the manipulation of dietary nutrient contents including phosphorous could affect compensatory growth of juvenile olive flounder, Paralichthys olivaceus. Thirty fish averaging 34.8 g per tank were randomly chosen and distributed into 15 flow-through 180-L tanks. Three experimental diets were prepared: the control (C) diet, high protein and lipid (HPL) diet, and HPL diet with supplementation of calcium phosphate-monobasic (HPLP). Five treatments were prepared in triplicate: fish were hand-fed daily with the C diet twice a day for 8 weeks (C-8W); fish were starved for 1 week, and then fed with the HPL or HPLP diets twice a day for 7 weeks, and referred to as HPL-7W and HPLP-7W, respectively; and fish were starved for 2 weeks, and then fed with the HPL or HPLP diets twice a day for 6 weeks, and referred to as HPL-6W and HPLP-6W, respectively. The body weight of fish with C-8W, HPL-7W and HPLP-7W treatments was higher than fish with HPL-6W and HPLP-6W treatments on week 2, 4 and 6 after an initiation of the trial. At the end of the 8-week trial, fish with HPLP-7W and HPL-7W treatments overcompensated, as compared to fish with C-8W treatment. Full compensation was not achieved in fish subjected to the 2-week feed deprivation (HPL-6W and HPLP-6W treatments). Overall feed intake by fish was proportional to weeks of feeding. Feed conversion ratio of fish with HPLP-7W, HPL-6W and HPLP-6W treatments was higher than fish with C-8W treatment. The study showed that dietary supplementation of protein and lipid resulted in overcompensation of juvenile olive flounder subjected to a 1-week feed deprivation, but not a 2-week feed deprivation. Additionally, dietary supplementation of phosphorous did not further improve compensatory growth of fish.
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