• 수산해양교육연구
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• 제25권6호
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• pp.1315-1323
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• 2013

The purpose of this research is to evaluate the effects of a commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diet on diseases prevalence and serological constituents and HSI of korean rockfish, Sebastes schlegeli grown in two commercial-scale aquaculture farms from June to December in 2009. The growth of MP-fed rockfish was slightly faster than EP-fed rockfish during experimental period, but did not show significant differences. The levels of TCHO, TG, Glucose and TP in the MP-fed rockfish group were higher than those of EP-fed group, whereas there was no significant difference in other biochemical factors of blood between two groups. In addition, bacteria and virus were not detected in both MP- and EP-fed rockfish groups, and the infection rates of gill fluke between two groups did not show clear difference. In conclusion, there was no comparable difference in growth and the health extents of one year rockfish by administration of the commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diets.

• 한국수산과학회지
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• 제45권6호
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• pp.679-685
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• 2012

A study was carried out to observe the effects of feed types on the growth, feed preference, and enteric feed transition rate of juvenile starry flounder, Platichthys stellatus for 45 days. Fifty fish (avg. 135 g) were stocked each in replication, and fed a commercial extruded pellet diet (EP, 45% protein) and a moist pellet diet (MP, 65% raw mackerel+35% feed powder in wet basis), respectively. The MP presented the higher performance than that of the EP on the feed efficiency ($68.3{\pm}0.9%$ for EP and $92.3{\pm}4.3%$ for MP) and the specific growth rate ($1.07{\pm}0.07$ for the EP and $1.20{\pm}0.05%$ for the MP). In contrast, the EP showed the higher feed preference in terms of the daily feed intake ($1.57{\pm}0.08%$ for the EP and $1.30{\pm}0.01$ for the MP) and the ad libitum feeding rate after a fast of 72 hours (1.73% for the EP and 1.35% for the MP). The feed transition rate through intestinal canals decreased exponentially in both the EP and the MP, showing the faster transition rate with the EP. In the result, starry flounder appeared to have the better feed preference to the EP, but have the higher feed efficiency and growth performance to the MP.

• 한국양식학회지
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• 제10권2호
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• pp.163-169
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• 1997

사료물성과 단백질원 배합비에 따른 조피볼락의 성장차이를 구명하기 위하여, 실험사료의 단백질원을 북양어분과 갈색어분으로 한 사료와 경제적인 측면을 고려하여 어분의 배합 비율을 낮추는 대신, 대두박, 콘글루텐 밀, 육분 및 우모분의 비율을 늘린 2종의 사료를 설계하여, 각각 EP(extruded-floating pellet, 부상사료), SP(slow-sinking pellet, 반부상사료), FP(fast-sinking pellet, 침강사료)와 MP (moist pellet, 습사료) 형태의 배합사료를 제조하였다. 평균체중 75 g의 조피볼락을 각 수조에 50마리씩 수용하여 $2(diet\times)4(diet type)\times3(replication)$ factorial design으로 15주간 사육하였다. 사육 실험한 결과, 실험사료와 사료형태에 따른 최종평균체중, 증체율, 사료효율, 사료 섭취율, 단백질 효율, 간중량비 및 내장중량비는 전혀 차이가 없는 것으로 나타났다(P>0.05). 실험 종료시의 실험 구별, 어체 부위별 일반성분 중에 사료별, 사료 형태별로 모두 간과 근육의 단백질 및 근육의 수분과 지질 함량은 실험구간별로 유의적인 차이가 없었다(P>0.05). 위와 같이 사료의 물성이나 침강 속도는 조피볼락의 성장, 영양소 이용효율, 사료 섭취율 및 체성분에 영향을 미치지 않은 것으로 나타나, 양식 현장에서 사료 형태에 관계없이 적절히 선택하여 사용할 수 있을 것으로 전망된다.

• 한국양식학회지
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• 제18권4호
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• pp.287-292
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• 2005

본 연구는 넙치 육성용으로 실험 부상배합사료와 시판사료 및 생사료의 효능을 비교하기 위해 평균 체중 43.5 g의 넙치를 8주 동안 사육하였다. 실험사료로 4종류의 부상배합사료(EPl-EP4), 시판사료 4종류(EP5-EP8)및 습사료(MP)를 준비하여 1일 3회 만복으로 공급하였다. 사육실험 결과, 생존율은 모든 실험구에서 $85\%$ 이상으로 양호하였으며, 증중률은 EP2-EP4 실험구에서 가장 높은 값을 보였으며, EP6 실험구에서 가장 낮았다. 사료효율과 단백질효율은 MP 실험구에서 가장 낮은 값을 보인 반면, 일일 사료섭취율과 일일 단백질섭취율은 MP 실험구에서 가장 높은 값을 보였다. 어체의 단백질 함량은 실험구간에 유의한 차이가 없었으나, 수분, 지질 및 회분 함량은 사료에 따라 유의한 차이를 보였다. 혈액의 총 단백질은 모든 실험구간에 유의한 차이가 없었으며 , 중성지방은 EP3 실험구에서 높은 값을 보이긴 하였지만, EP7 실험구를 제외한 모든 실험구간에 유의한 차이는 없었다. 이상의 결과들로 보아 평균체중 42 g${\~}$108 g인 넙치의 성장을 위해 EP2-EP4를 공급하여도 좋을 것으로 판단된다.

• 한국수산과학회지
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• 제42권5호
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• pp.476-480
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• 2009

This study was conducted to evaluate the effect of extruded pellets (EP) containing different levels of protein (51%-55%) and lipid (9%-15%) for growth of flounder (Paralichthys olivaceus) comparing with raw fish-based moist pellet (MP). Two replicate groups of 40 fish per each tank (initial mean weight 106 g) were fed one of three experimental EP (EP1, EP2 and EP3) containing different protein and lipid levels, a commercial EP (EP4) and MP for 16 weeks. Survival was not significantly different among all groups. Final mean weight of fish fed MP was significantly lower than that of fish fed EP1, EP2 and EP4 (P<0.05), but not significantly different from fish fed EP3. Feed efficiency of MP-fed fish was significantly lower than fish fed all EP formulations (P<0.05), but no significant difference was observed among the EP groups. Daily feed intake of MP-fed fish was significantly higher than fish fed all EP formulations (P<0.05). Condition factor was not significantly different among all groups. Whole body moisture and crude lipid contents were significantly affected by diet (P<0.05). Growth and feed efficiency of flounder was not affected by EP protein and lipid levels. Dietary formulation used in EP1, EP2 and EP3 can be applied to the practical feeding of flounder.

• 수산해양교육연구
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• 제21권4호
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• pp.562-567
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• 2009

This study was conducted to evaluate of improving extruded pellet (EP) for growth of juvenile flounder by comparing with raw fish-based moist pellet (MP) diet. Two replicate groups of 80 fish per each tank (initial weight of $36.0{\pm}1.2 g$) were fed one of the three EPs (EP1, EP2 and CEP) and (MP for 16 weeks. Survival was not significantly affected by experimental diets (P>0.05). Weight gain of fish fed the MP was not significantly different from that of fish fed the EP1 & EP2 (P>0.05), but that of fish fed CEP was significantly lower than that of fish fed MP (P<0.05). Specific growth rate of fish fed the CEP was significantly lower than those of fish fed EP1, EP2 and MP (P<0.05). Feed efficiency of fish fed the EP1 was significantly higher than those of fish fed CEP and MP (P<0.05), but not significantly different from those of fish fed EP2 (P>0.05). The Contents of crude protein and crude lipid in whole body were significantly different among all groups (P<0.05). Therefore, these results strongly suggest that EP1 & EP2 diets could be developed to replace MP diet for flounder without adverse effects on growth performance.

• 수산해양교육연구
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• 제21권4호
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• pp.556-561
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• 2009

This study was conducted to evaluate the laboratory formulated extruded pellet (EP) for olive flounder Paralichthys olivaceus in the East Sea. Three replicate groups of 3,200 fish per each tank (initial weight of $28.1{\pm}0.2g$) were fed one of the two EPs (EP and CEP) and Moist pellet (MP) for 16 months in a commercial farm (Pohang, Korea). Survival was not significantly affected by experimental diets (P>0.05). Weight gain and specific growth rate of fish fed the EP were not significantly different from those of fish fed the MP, but that of fish fed CEP was significantly lower than that of fish fed EP and MP (P<0.05). Feed efficiency and protein efficiency ratio of fish fed the EP was significantly higher than those of fish fed MP (P<0.05), but not significantly different from those of fish fed CEP (P>0.05). The Contents of moisture, crude protein and crude lipid in the dorsal muscle were not significantly different among all groups (P>0.05). These results clearly indicated that the laboratory formulated extruded pellet used in this study can be developed to replace the moist pellet without affecting any growth performance of olive flounder in the commercial farm feeding trail.

• 수산해양교육연구
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• 제24권4호
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• pp.602-608
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• 2012

This study was conducted to evaluate the effect of commercial extruded pellet (EP) diet on the growth and water quality compared with a raw fish moist pellet (MP) diet for flounder on field feeding experiments. Three replicate groups of 130 fish per each tank (initial weight of 380 g) were fed one of the EP and Moist pellet (MP) for 7 months. In field feeding experiment, no significant difference was observed in final mean weight of fish fed the experimental EP (1,233 g) and MP (1,237 g), and any noticeable problem caused by feeding the experimental EP was not found during the whole period of feeding trial. Feed efficiency of fish fed the experimental EP was higher than that of MP, and there was no significant difference in survival between the fish fed experimental EP and MP. The concentrations of SS, COD, TN and TP of seawater in tanks of MP groups were 1-5 times higher than those of EP groups. Therefore, these results strongly suggest that diet EP could be developed to replace MP diet for the marketable size of production for flounder without adverse effects on growth performance and water quality.

• 한국수산과학회지
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• 제46권3호
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• pp.282-286
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• 2013

This study was conducted to compare extruded pellets (EP) and soft extruded pellets (SEP) with a raw fish-based moist pellet (MP) diet on the growth and flesh quality of Korean rockfish Sebastes schlegeli. Three groups of 20,000 fish (initial mean weight 133 g) per net-cage ($6{\times}12{\times}7m$) were fed commercial EP, SEP or MP for 16 months. The survival of fish fed SEP was higher than those of fish fed EP or MP. The highest growth performances were observed in the mean weight gain, total weight gain, and feed efficiency of fish fed MP, followed by those fed EP and SEP. Among the fish fed on extruded pellets, the total weight gain of fish fed SEP was higher than that of those fed EP, while fish fed EP grew faster than those fed SEP. No notable differences in body composition, sensory scores or textural properties of the dorsal muscle were observed in fish fed on EP, SEP or MP. Thus, it is suggested that extruded pellets, rather than raw fish-based moist pellets, could be fed to Korean rockfish without compromising flesh quality.

• 한국양식학회지
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• 제21권2호
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• pp.102-106
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• 2008

본 연구는 미성어기 넙치 사육용으로 부상배합사료를 제조하여 습사료와 그 효능을 비교함으로써 넙치 배합사료 개발을 위한 자료를 제공하고자 수행되었다. 최초 평균체중 594g의 실험어를 6개의 15톤 수조에 150마리씩 사료별 2반복으로 수용하여, 실험 부상배합사료 2종류와 습사료를 1일 2회 만복으로 공급하며 32주간 사육하였다. 사육기간 동안의 평균수온은 $13.2{\pm}4.0^{\circ}C$였다. 생존율은 실험구 간에 유의한 차이가 없었다. 최종체중은 MP 실험구가 EP1과는 차이가 없었으나, EP2 보다는 높았다. 사료효율은 MP 실험구가 EP 실험구보다 낮았으며, 사료섭취율은 MP가 EP 실험구보다 높았다. 실험어의 비만도는 모든 실험구 간에 차이가 없었다. 사육실험 종료 후, 실험어 등근육의 수분, 조단백질 및 조지질 함량은 실험사료에 유의한 영향을 받았다. 이상의 결과로부터, 본 연구에 사용된 EP의 사료조성은 미성어기에서 상품크기의 넙치 사육을 위한 MP 대체 배합사료 개발에 도움이 될 것으로 판단된다.