• 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.

• 한국식품과학회지
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• 제8권4호
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• pp.212-218
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• 1976

생선(生鮮)으로 부터 생선(生鮮) 냄새를 효과적(效果的)으로 제거(除去)하기 위한 기초작업(基礎作業)으로서 ethanol과 물을 추출용매(抽出溶媒)로 사용(使用)하여 꽁치로 부터 생선(生鮮) 냄새의 주성분(主成分)인 trimethylamine과 변패(變敗)의 원인(原因)이 되며 직접간접(直接間接)으로 불쾌취(不快臭)를 조성(造成)하는 지방(脂肪)을 제거(除去)할 목적(目的)으로 실험(實驗)하였던 바 다음과 같은 결과(結果)를 얻었다. 1. 꽁치중(中)의 trimethylamine은 추출시(抽出時)의 ethanol의 최종농도(最終濃度)가 $40{\sim}55%$ 수준이었을 때 가장 추출(抽出)이 잘되었다. 2. 꽁치를 boiling absolute ethanol로서 연속추출(連續抽出)을 행(行)할 때 추출(抽出)은 서로 다른 두 단계로 진행(進行)되었다. a) 추출(抽出)의 첫 단계에선 생선(生鮮)의 탈수(脫水)와 동시(同時)에 trimethylamine이 주(主)로 추출(抽出)되었으며 b) 생선(生鮮)이 탈수(脫水)된 그다음 단계에서 지방(脂肪)이 효율적(?率的)으로 추출(抽出)되었다.

• 수산해양기술연구
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• 제59권1호
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• pp.28-34
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• 2023

In the anchovy boat seine fishing boat, it is necessary to select other aquatic organisms other than live anchovies, which are the target species of catch. By making a rotating roller sorter using hydraulic pressure, the anchovy sorting amount was compared and the sorting accuracy of the rotary roller sorter, and the discharge speed of butter fish and jerry fish according to the number of roller revolutions were analyzed. The rotating roller sorter increases the weight of the sorted raw anchovy by 54%, 74% and 91.5% compared to the round bar fixed type, so it can reduce the required time by an average of 73.2%. As a result of converting the sorting accuracy to the weight of pure anchovies excluding the catch weight, the round bar fixed type was 89%; however, the average of the rotating roller sorter was 97.7%. Thus, the sorting accuracy of the rotary roller sorter was further improved by about 8.7%. The roller speed moved 7% at 300 rpm, 7.5% at 600 rpm, and 16% at 900 rpm, so butter fish were discharged overboard 10% faster than jelly fish on average. In addition, the average feed speed of butter fish and jelly fish is 1,400 mm/s when the roller rotation speed is 300 rpm, 1,480 mm/s at 600 rpm, and 1,850 mm/s at 900 rpm. A Φ58 mm roller rotates once it moved about 1.23 mm. In the future, a follow-up study of quantitative evaluation is needed targeting more non-target fish species of anchovy boat seine.

• 수산해양교육연구
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• 제26권3호
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• pp.667-675
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• 2014

Two types of diets, extruded pellet (EP) and raw-fish-based moist pellet (MP) were fed to compare growth, water quality and histology of olive flounder, Paralichthys olivaceus in Jeju fish farm. Two groups of 7000 fish per each tank (initial mean weight 51 g) were fed one of two diets for 7 months. At the end of the feeding trial, significant differences were found in weight gain and feed utilization. Dissolved oxygen (DO) level of the MP tank was decreased from 7.98 to 6.89 after feeding. There were no significant differences in hematocrit, hemoglobin, alanine aminotransferase and aspartate aminotransferase of fish fed the two diets. Whole body protein content of fish fed the EP was significantly higher than that of fish fed the MP. While the feeding rate by month indicated numerically decreased, fish fed the MP had higher feed intake than that of fish fed the EP. Histological examination of hepatopancreas, kidney, and anterior intestine of fish fed the EP did not show any negative effects compared to those of fish fed the MP. This study revealed that EP could substitute for MP in terms of growth performance, blood parameters, water quality and histology of olive flounder.

• 한국수산과학회지
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• 제53권2호
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• pp.181-190
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• 2020

This study was conducted to estimate the optimum dietary DHA oil level and replacement level of enzyme treated fish meal (EFM) with sardine fish meal for juvenile Atlantic bluefin tuna Thunnus thynnus. Four diets were used: 1) EFM75 in which 75% EFM and 4% DHA oil were applied, 2) EFM60, with 60% EFM and 15% sardine fish meal, 3) DHA2 with 2% of DHA oil, and 4) SL as a raw fish feed. In a feeding trial, juvenile bluefin tuna (body weight 30.1 g) were randomly stocked into four experimental tanks (69 tones) and fed the experimental diets for 13 days. Fish weight gain was higher in the EFM75 and SL groups than in the DHA2 and EFM60 groups. The feed conversion ratio was lower in the EFM75 and DHA2 groups than in the EFM60 and SL groups. Survival was higher in fish fed the formulated diet groups (EFM75, EFM60 and DHA2) than in fish fed SL. This study clearly indicates that up to 10% dietary sardine fish meal can be used in juvenile T. thynnus diets, with an optimum dietary DHA oil level of approximately 3%.

• 한국수산과학회지
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• 제42권6호
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• pp.604-608
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• 2009

This study was conducted to evaluate extruded pellet (EP) diet compared with a raw fish moist pellet (MP) diet for flounder, Paralichthys olivaceus on field feeding experiments in Jeju area. The experimental EP diet (juvenile, growing and adult) was prepared based on the former studies on nutrient requirements and feed ingredient of flounder. Fish were distributed randomly to each aquarium as a group of 102,300 fish (initial mean weight 97 g) in field experiment I and reared randomly to each aquarium as a group of 40,000 fish (initial mean weight 120 g) in field experiment II. In field feeding experiment I conducted in commercial flounder farm, survival, wt. gain (94-1,090 g), feed efficiency and condition factor of fish fed experimental EP were comparable to those of fish fed MP, but considerably higher protein efficiency ratio were observed in fish fed experimental EP. In field feeding experiment II, no significant difference was observed in final mean weight of fish fed the experimental EP (1,234 g) and MP (1,286 g), and any noticeable problem caused by feeding the experimental EP was not found during the whole period of feeding trial. Survival of fish fed the experimental EP was lower than that of MP, and there was no significant difference in feed efficiency between the fish fed experimental EP and MP. Therefore, these results strongly suggest that diet EP could be developed to replace MP diet for the marketable size (1.3 kg) of production for flounder without adverse effects on growth performance. In particular, abdominal dropsy and reduction of condition factor, which are frequently occurred in commercial EP feeding farms, were not observed in flounder fed experimental EP.

• 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.

• 한국수산과학회지
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• 제53권3호
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• pp.423-431
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• 2020

This study was conducted to investigate in vivo and in vitro digestibility in juvenile Atlantic Bluefin tuna Thunnus thynnus. In vivo digestibility was compared between four experimental diets to determine the optimum dietary inclusion level of an enzyme-treated sardine fish meal (EFM) and sardine fish meal (FM). The experimental diets were as follows; EFM75 (75% EFM), EFM60 (60% EFM and 15% FM), FM75 (75% FM) and SL (frozen sand lance) as a raw fish feed. Feces of Bluefin tuna (90.3 g) were collected both by siphoning from a 700 L cage and by dissection in 69 ton concrete rearing tanks. For the siphoning method, protein digestibility was higher in the tuna fed SL diet than that of other groups. The lowest protein digestibility was observed in FM75. For the dissection method, protein digestibility was higher in tuna fed EFM75 diet than that of other groups. The lowest protein digestibility was observed in the EFM60 group. In vitro digestibility was compared in six protein sources to find an alternative source of EFM for the tuna feed. The highest in vitro digestibility was observed in EFM (92%) followed by low temperature FM (72%), meat meal (65%), feather meal (60%), sardine fish meal (57%) and poultry by-product meal (55%).

• 한국수산과학회지
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• 제55권5호
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• pp.533-540
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• 2022

We evaluated a worm-based extruded pellet diet with black soldier fly Hermetia illucens larvae (BSF) meal and BSF oil for olive flounder Paralichthys olivaceus through field feeding experiments at a commercial aquafarm. We prepared two experimental diets by replacing fish meal and fish oil with BSF meal and BSF oil (BEP-1, BSF meal 7%, BSF oil 1%) and (BEP-2, BSF oil 2%), respectively. We prepared raw-fish based moist pellets (MP) for comparison between the two experimental diets. We distributed the olive flounder (220±6.29 g) in square (10 m×10 m×1 m) concrete, 100 ton tanks at a density of 1,600 fish per tank (n=3) in triplicate for each dietary treatment. We fed the diets to the fish to apparent satiation for 7 months. At the end of the feeding trial, we found no substantial differences between the groups in terms of growth performance, survival, or feed utilization. None of the diet groups showed any changes in either hematological or non-specific immune responses. The histological observation of the intestine showed that the goblet cell number and cholecystokinin-producing cell activity increased in the fish fed the BEP diet compared with the those of the fish fed the MP diet. These results indicated that dietary BSF meal and oil can be used for olive flounder without compromising growth or, hematological and histological parameters.

• 한국식품과학회지
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• 제41권1호
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• pp.42-49
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• 2009

본 연구는 건조 배합사료를 공급한 양식 넙치와 생사료를 공급한 양식넙치의 품질특성을 비교해 보고자 하였다. 즉, 건조 배합사료로서는 시중에 판매되고 있는 상품사료(CEP)와 직접 설계 제조한 실험사료(FEP) 2종을 사용하였고 생사료(MP)를 대조구로하여, 약 10달간 각각의 사료를 공급한 넙치(1.15 kg)의 등근육 및 지느러미 살을 대상으로 하여 각 사료 공급에 의한 일반성분, 지방산, 아미노산, 관능평가 및 물성측정을 통한 어육의 품질차이를 비교하였다. 넙치 등근육의 일반성분의 각 함량은 차이가 없었으나, 지느러미 살의 경우는 MP 공급구가 수분함량이 높고 조지방 함량은 낮았다. 넙치 어육의 지방산 조성은, 넙치를 사육하는 동안 공급하는 사료의 종류에 따라 등근육 및 지느러미살의 지방산 조성은 차이가 있음을 알 수 있었고, 주로 축산육의 품질 측정시 지표로 사용되던 18 : 0/18 : 2, 18 : 2/18 : 3 및 n-6/n-3과 같은 지방산의 비율을 활용해서 어류의 풍미와 정미성을 비롯해 어육의 질감 차이까지도 예측할 수 있을 것으로 사료되었다. 또한, MP, CEP 및 FEP를 공급한 넙치 등근육의 구성아미노산 조성 중 EAA, FAA, SAAA, SAA 및 FRAA의 함량에는 차이가 없었으나, 지느러미살의 경우는 맛 관련 성분인 glutamic acid와 감미성분인 glycine 및 alanine이 각 사료구별로 유의적인 차이를 나타내었다. 냄새, 외관, 맛, 질감 및 종합적인 기호도면에 대해 관능검사를 실시한 결과 모든 사료구에서 유의적인 차이는 없었고, 경도(hardness)는 MP 공급구가 CEP 및 FEP 공급구보다 높았다. 물성측정 결과도 역시 모든 사료구에서 유의적인 차이는 없었다. 본 실험 결과로부터 건조 배합사료를 공급한 넙치의 등근육 및 지느러미 살의 품질 특성은 생사료를 공급한 넙치와 큰 차이는 없음을 알 수 있었다.