Effects of dietary protein and lipid levels for growth performance, feed utilization and body composition of juvenile spotted sea bass (Lateolabrax maculatus)
점농어 치어 사료내 단백질 지질 함량에 따른 성장 효과, 사료 이용성 및 체조성에 미치는 영향
- 발행기관 강릉원주대학교 일반대학원
- 지도교수 이상민
- 발행년도 2015
- 학위수여년월 2015. 8
- 학위명 석사
- 학과 및 전공 일반대학원 해양생물공학과
- 원문페이지 45
- 실제URI http://www.dcollection.net/handler/kangnung/000000007919
- 본문언어 영어
초록/요약
Abstract This study was conducted to evaluate the effects of dietary protein and lipid levels on growth, feed utilization and body composition of juvenile spotted sea bass (Lateolabrax maculatus). Eight experimental diets were formulated to contain four protein levels (25, 35, 45 and 55% crude protein) and two lipid levels (7 and 14% crude lipid) designated as P25L7, P35L7, P45L7, P55L7, P25L14, P35L14 and P45L14 respectively. Fish (initial average 5.5±0.03 g) were fed the test diets for 9 weeks. Survival of juvenile spotted sea bass in response to diets containing 25 to 55% protein and 7 to 14% lipid for 9 weeks was over 89%, and P25L7 diet was lower than in other groups (P<0.05). Weight gain (WG) and specific growth rate (SGR) were significantly affected by dietary protein and lipid levels (P<0.05). WG and SGR were improved with increasing dietary protein and lipid levels, and the highest values were observed in fish fed the P55L14 diet. No significant differences were observed in daily feed intake (DFI) and daily protein intake (DPI) among the groups. Feed efficiency (FE) and protein efficiency ratio (PER) of fish tended to increase with increasing dietary lipid level at the same protein level. FE and PER were significantly affected by both dietary protein and lipid levels (P<0.05), and FE and SGR was significantly higher with the P55L14 diet than with other diets (P<0.05), and P25L7 diet was lower than in other groups (P<0.05). No significant differences were observed in condition factor (CF) and hepatosomatic index (HSI) among the groups. No significant differences were observed in the contents of moisture and ash of the whole body. Crude lipid contents of fish were affected by dietary protein and lipid levels (P<0.05). Crude lipid contents of fish tended to increase with increasing dietary lipid level at the same protein level. Crude lipid contents of fish fed the P25L7 diet was lower than that of fish fed the 14% lipid diets regardless of protein level (P<0.05). The results of this study suggest that the diet containing 55% protein and 14% lipid with P/E ratio 25.3 mg/kJ can support maximum growth of juvenile spotted sea bass.
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CONTENTS
Abstract 1
1. Introduction 3
2. Materials and methods 5
2.1. Experimental diets 5
2.2. Experimental fish and feeding trial 8
2.3. Chemical analysis 8
2.4. Blood chemistry 9
2.5. Statistical analysis 9
3. Results 11
3.1. Growth performance 11
3.2 Body composition 11
3.3. Fatty acid composition 12
3.4. Plasma biochemical parameter 12
4. Discussion 28
국문요약 31
Acknowledgment 32
References 33
