共查询到20条相似文献，搜索用时 61 毫秒
1.
2.
饲料中添加纤维素酶对团头鲂生长的影响 总被引：1，自引：0，他引：1
在 A、B、C、C0 和 D五组团头鲂鱼种 (体均重 2 .35± 0 .2 0 g)的配合饲料中分别加 0、6 0 0、2 4 0 0、2 4 0 0和 4 2 0 0 U/ kg纤维素酶。其中 B、C、D组中加入的纤维素酶都经过适当的预处理 ,而 C0 组饲料则直接添加 2 4 0 0 U/ kg的纤维素酶。经 56天喂养试验 ,结果显示 :投喂 B、C两组饲料的鱼体增重率分别比 A组提高了 14 .59%和 34.18% ,饲料效率也分别提高 6 .0 6 %和13.6 4 % ;而 C0 和 D组的生长性能则与 A组之间没有显著性差异。 相似文献
3.
饲料中油脂的质和量对团头鲂生长的影响 总被引：4，自引：0，他引：4
周文玉俞春玉刘建忠杨国华 《水产科技情报》1997,24(1):3-6
研究在饲料蛋白水平,能量水平均能满足生长需要的前提下,饲料中添加不同含量及不同品质的脂肪对团头鲂鱼种水平的影响。试验所用的精制饲料用进口酪蛋白及脂肪,糊精、维生素,矿物质、纤维素加工而成,脂肪为豆油与鳕鱼肝油。 相似文献
4.
5.
用菜饼、混养鱼破碎料、草食性鱼种专用料饲养团头鲂鱼种,经过150d饲养试验,饵料系数为5．09、1．44、1．36;鱼种成活率为39％、65％、76％;鱼种增重饲料成本为4．83元／kg、3．02元／kg、2．91元／kg。草食性鱼种专用营养水平高于混养鱼料,其生长速度、成活率、产量、经济效益明显优于混养鱼料。鱼体化学组成、肥满度、内脏比无显著差异。 相似文献
6.
盐度对青鱼,团头鲂鱼种生态,生长的影响 总被引：4，自引：0，他引：4
采用等对数间距法测定青鱼,团头鲂鱼种的盐度半致死值,以及采用盐度梯度饲养试验,测定青鱼,团头鲂鱼种盐度的最适生长值,初始生长值,初台摄食值和适宜生长范围。 相似文献
7.
8.
9.
不同脂肪源饲料对草鱼稚鱼生长的影响刘玮,徐萍,任本根,龚纲明（江西省科学院生物资源研究所,南昌３３００２９）关键词草鱼,鱼饲料,必采脂肪酸ＥＦＦＥＣＴＳＯＦＤＩＥＴＳＣＯＮＴＡＩＮＩＮＧＤＩＦＦＥＲＥＮＴＬＩＰＩＤＳＯＮＧＲＯＷＴＨＯＦＪＵＶＥＮＩＬ... 相似文献
10.
用配合饲料培育大规格团头鲂鱼种试验,经过1987～1991年反复的试验研究,终于摸索出一套具有产量高(750千克/667m~2左右)、团头鲂鱼种比例大(45%左右)、鱼种出塘规格大和经济效益高等特点的养殖技术,现总结如下,仅供同行参考。 相似文献
11.
Mokrani Ahmed Hualiang Liang Hopeson Chisomo Kasiya Ke Ji Xianping Ge Mingchun Ren Bo Liu Xuezhi Zhu Ajun Sun 《Aquaculture Nutrition》2019,25(1):205-214
Six extruded diets were formulated with a graded level of fish meal (FM); diet 1 and diet 2 were formulated with 80 g/kg FM; diet 3 and diet 4 were formulated with 40 g/kg FM; and diet 5 and diet 6 were devoid of FM. Hence, diet 2, diet 4 and diet 6 were supplemented with essential amino acids (EAAs). The diets were fed throughout an eight‐week feeding trial. The results revealed that specific growth rate (SGR), feed conversion ratio (FCR), body weight gain (BWG) and protein efficiency ratio (PER) were influenced by FM reduction and improved by the addition of EAA (p < 0.05). A survival rate (SR), whole body content of protein, lipid, moisture and ash, and plasma total protein (TP), albumin (ALB), triglyceride (TG) and urea (UN) did not influence by dietary treatments (p > 0.05). Additionally, target of rapamycin (TOR) pathway did not influence by dietary treatments (p > 0.05). Expression levels of hepatic peptide transporter 1 (Pept1) and peptide transporter 2 (Pept2) decreased against FM reduction and improved significantly in the groups fed diet 4 and diet 6. In summary, the findings revealed that diet containing plant proteins mixture supplemented with EAA could totally replace FM in the practical diet of blunt snout bream. 相似文献
12.
进行了主养１龄团头舫鱼种和２龄团头鲂养成的高产试验，研究了团头舫和配养品种的放养密度、饵料配方、水质管理、投饵方法等技术。结果：１年育成大规格鱼种，２年养成商品鱼，团头鲂养殖周期由３年缩短为２年，平均每亩净产团头鲂鱼种３９７．５０ｋｇ，平均尾重３３．９７ｇ；平均每亩净产团头舫成鱼４６１．０２ｋｇ，平均尾重３４７．３ｇ。专家鉴定认为：本研究高产技术达国内先进水平。 相似文献
13.
团头鲂水库网箱养殖试验 总被引：1，自引：0，他引：1
在网箱中进行团头鲂（Megalobrama amblyocephala)鱼种,成鱼养殖,鱼种箱平均产量470kg,平均尾重81．5g,个体净增重12．19倍,平均饲料系数2．22,成鱼箱平均产量828.65kg,平均尾重435g,个体净增重7．53倍,平均饲料系数2．25。 相似文献
14.
Y.J. Liao M.C. Ren B. Liu S.M. Sun H.H. Cui J. Xie Q.L. Zhou L.K. Pan R.L. Chen X.P. Ge 《Aquaculture Nutrition》2014,20(6):741-752
A 9‐week feeding trial was conducted to investigate the dietary methionine requirement of juvenile Megalobrama amblycephala at a constant dietary cystine level. Six semipurified diets were formulated to contain graded dietary methionine levels from 3.9 to 15.4 g kg?1 in about 2.5 g kg?1 increments in the presence of 2.2 g kg?1 cystine. Results showed that specific growth rate (SGR) and protein efficiency ratio (PER) significantly increased with increasing dietary methionine levels from 3.9 to 12.4 g kg?1 and thereafter kept stable. Maximum protein productive value (PPV), nitrogen retention efficiency (NRE) and liver weight were observed in 8.5 g methionine kg?1 diet. Protein contents in whole fish body were positively correlated with dietary methionine level, while lipid contents were negatively correlated with it. Morphological index and hepatic glutamate‐pyruvate transaminase (GPT) activities were independent of dietary methionine levels. However, dietary methionine supplementation significantly improved haematological parameters, plasma methionine and total essential amino acid contents and hepatic glutamate‐oxaloacetate transaminase (GOT) activities. Analysis of dose response using broken‐line regression on the basis of SGR and PPV versus dietary methionine level estimated the optimum dietary methionine requirements of juvenile M. amblycephala to be between 8.5 and 8.4 g kg?1 of diet (25.0 and 24.7 g kg?1 of protein) in the presence of 2.2 g kg?1 cystine, respectively. Hence, the corresponding total sulphur amino acids requirements of this species were calculated to be 10.7 and 10.6 g kg?1 of diet (31.5 and 31.2 g kg?1 of dietary protein). 相似文献
15.
16.
17.
18.
This study aimed to investigate the optimum dietary carbohydrate/lipid (CHO/L) ratio for fingerling blunt snout bream Megalobrama amblycephala (average initial weight: 6.61 ± 0.03 g). Six isonitrogenous and isoenergetic diets were formulated to contain various CHO/L ratios ranging from 1.62 to 24.20. Each diet was tested in four replicates for 10 weeks. Specific growth rate (SGR), feed conversion ratio and nitrogen and energy retention all improved significantly (P < 0.05) as dietary CHO/L ratios decreased from 24.20 to 5.64 but showed little difference (P > 0.05) as dietary CHO/L ratios ranged from 2.45 to 5.64. Hepatosomatic index increased significantly (P < 0.05) as dietary CHO/L ratios increased, whereas intraperitoneal fat ratio showed an opposite trend (P < 0.05). Opposite to moisture content, lipid content of whole body and carcass all increased significantly (P < 0.05) as dietary CHO/L ratios decreased. Liver lipid content showed little difference (P > 0.05) among all the treatments, while liver glycogen content increased significantly (P < 0.05) with increasing CHO/L ratios. High dietary carbohydrate enhanced the activities of liver hexokinase, pyruvate kinase and glucose‐6‐phosphate dehydrogenase but did not induce hyperglycaemia. Based on the second‐order polynomial regression analysis of SGR, the optimal dietary carbohydrate and lipid contents for fingerling blunt snout bream were 291.7 and 81.4 g kg−1, respectively, with a corresponding dietary CHO/L ratio of 3.58. 相似文献
19.
X.‐F. Li T.‐J. Wang Y. Qian G.‐Z. Jiang D.‐D. Zhang W.‐B. Liu 《Aquaculture Nutrition》2017,23(6):1410-1417
This study aimed to determine the optimal dietary niacin requirement of juvenile Megalobrama amblycephala. Fish, with an average weight of 3.62 ± 0.02 g, were randomly divided into six groups and fed six purified diets with graded levels of niacin (0, 10, 20, 30, 40 and 50 mg/kg) three times daily for 8 weeks. The survival rate, weight gain (WG), feed conversion ratio, protein efficiency and protein retention all significantly improved (p < .05) as the dietary niacin level increased from 0 to 30 mg/kg but showed no significant difference (p > .05) with further increases in niacin levels. The supplementation of 30 mg/kg niacin also led to a significant (p < .01) reduction in the viscerosomatic index, hepatosomatic index and mesenteric fat index. The dietary niacin levels exhibited minimal effects on whole‐body moisture and ash content (p > .05) but exerted a significant (p < .05) influence on protein and lipid contents and liver nicotinamide concentrations with high values obtained in fish receiving greater than 30 mg/kg of niacin. In addition, moderate levels of niacin lowered plasma triglycerides, non‐esterified fatty acid and low‐density lipoprotein cholesterol concentrations (p < .05). Based on the broken‐line regression analysis of WG and liver nicotinamide content, the optimal dietary niacin requirement of juvenile blunt snout bream was 31.25 and 30.62 mg/kg, respectively. 相似文献
20.
K. Ji H. Liang H. Chisomo‐Kasiya A. Mokrani X. Ge M. Ren B. Liu 《Aquaculture Nutrition》2018,24(5):1474-1483
To investigate the effects of dietary tryptophan on growth and glycometabolism in juvenile blunt snout bream, 450 fish (initial weight 23.33 ± 0.03 g) were fed six practical diets with graded levels of tryptophan (from 0.79 g/kg to 5.96 g/kg dry matter) for 8 weeks. Results showed that final weight, per cent weight gain (PWG), protein efficiency rate, feed intake and feed conversion ratio (FCR) were significantly improved by 2.80 g/kg diet. The maximum values of protein and ash were observed in 2.80 g/kg diet, while moisture was minimum. Lipid content of fish fed 3.95 g/kg diet was significantly higher than other diets. The highest plasma insulin‐like growth factor‐1 (IGF‐1) content was observed in 0.79 g/kg diet. In the liver, IGF‐1 mRNA levels were significantly downregulated by 2.80 g/kg dietary tryptophan, while glucokinase levels were by 3.95 g/kg, while glucose‐6‐phosphatase and phosphoenolpyruvate carboxykinase mRNA levels showed a converse trend compared with IGF‐1. Based on PWG and FCR, the optimal dietary tryptophan level was determined to be 1.99 g/kg (6.20 g/kg of dietary protein) and 1.96 g/kg (6.11 g/kg of dietary protein), respectively, using broken‐line regression analysis. 相似文献