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1.
观音阁水库15℃以上的年度积温为3517-3620℃，2001年网箱养鲤增重9倍、鲫鱼增重3．6倍；2002年网箱养鲤增重8倍、鲫鱼增重6倍。适宜开展网箱养殖常温性鱼类。 相似文献
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１３．５ｈｍ＾２水面使用配合饲料快速养殖卿、链、镛鱼夏花，青虾苗及河蟹大眼幼体，共产成鱼３２９５６ｋｇ，群体增重９２．９９倍；产青虾２２７８ｋｇ，群体增重５６．２５倍；产成蟹７４９２．５ｋｇ，群体增重７４倍。每公产值８．０４万元，毛利润３．３８万元，毛利率４２．１１％。 相似文献
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长江、瓯江中华绒螯蟹蟹种培育的比较试验 总被引：5，自引：0，他引：5
长江和瓯江的中华绒螯蟹豆蟹培育为扣蟹，长江蟹群体增重２２．０８倍，回捕率为４７．１８％；瓯江蟹群体增重６．１９倍，回捕率为１７．１０％。 相似文献
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１９９１年对淤泥团头鲂和本地团头鲂进行了对比养殖试验，经１５７天养殖，淤泥团头鲂平均增重２．０５倍，本地团头鲂平均增重０．８３倍同年１１月，专家鉴定认为，本研究在山东省属首次，其技术为省内先进水平。 相似文献
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鱼种箱平均产量18.81kg/m^2，平均尾重81.5g,个体净增重15．3倍，平均饮料系数2．22，成鱼箱平均产量33.1kg/m^2,平均尾重435g，个体净增重7．93倍，平均饮料系数2．25。 相似文献
8.
利用浅水草型湖泊网围养殖商品蟹，甲匡投放长江水质系隔年蟹种，乙匡投放当年５期幼稚蟹，丙匡投放辽河水系隔年蟹种，进行对比试验，甲匡成蟹平均上市规格１４２ｇ／只，净增重７．０倍，投入产出比１：１．７０，乙匡成蟹平均规格１００ｇ／只，净增重６４倍，投入产出比１：１．０９，丙匡成蟹平均规格１０５ｇ／只，净增重３．１倍，投入产出比１：１．０８。 相似文献
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扣蟹土池养殖优势高产技术 总被引：1，自引：0，他引：1
利用生态养殖模式，投喂天然绿色饲料。蟹苗规格0.1g/尾，经7个月饲养，平均规格19g/只，个体增重155倍，回捕率77.1%。饵料系数2.7。投入产出比1：3.07，纯利润15.2元／m^2。 相似文献
11.
A two (dietary energy levels; low energy, LE and high energy, HE) × 4 (feeding frequency; one feeding in 2 days, one feeding daily, two times daily and three times daily) factorial experiment was performed to determine the effects of dietary energy level and/or feeding frequency on the growth and body composition of juvenile flounder Paralichthys olivaceus. The survival rate was not significantly different among treatments. Weight gain of fish fed the LE and HE diets significantly increased as feeding frequency increased. The weight gain of fish fed the LE diet was higher at each level of increasing feeding frequency. The weight gain of fish fed the HE diet was higher than that of fish fed the LE diet once in 2 days and once daily, but weight gain of fish fed the HE diet was lower than the LE diet three times daily. Daily feed intake was significantly influenced by feeding frequency, but not by dietary energy level. Feed efficiency of fish fed the HE diet once daily was significantly higher than that of fish fed the LE diet once in 2 days, but no significant difference in feed efficiency was observed among other groups of fish. The protein efficiency ratio of fish fed the LE diet once in 2 days was the lowest. Feeding frequency and dietary energy level had a significant effect on the body lipid content. A feeding frequency of two times or three times daily would be effective, depending on dietary energy level for maximum growth of juvenile flounder grown from 3.5 to 15 g. 相似文献
12.
A. BARAKAT R. ROUMIEH N.E. ABDEL MEGUID J. GHANAWI I. PATRICK SAOUD 《Aquaculture Nutrition》2011,17(3):e773-e780
The present work was designed to evaluate the effects of various feeding regimens on rabbitfish growth and condition. Twelve juvenile rabbitfish Siganus rivulatus (7.3 ± 0.1 g) were stocked into each of 15 tanks. Tanks were randomly assigned one of five treatments with three replicate tanks per treatment. Treatments were G‐I: fish fed once daily at 08.00; G‐II: fish fed once daily at 17.00; G‐III: fish fed twice daily at 08.00, 17.00; G‐IV: fish fed three times daily, at 08.00, 13.00, 17.00; G‐V: fish fed three times daily at 08.00, 13.00, 17.00 for six consecutive days, followed by 1 day of fasting. Fish were offered a commercial diet (Golden Extruded, 450 g kg?1 protein, 200 g kg?1 lipids) to apparent satiation. At the conclusion of the study, weight gain of rabbitfish fed three times daily (273.1%) was significantly greater than weight gain of fish in all other treatments. Feed conversion ratio (FCR) of fish fed once per day (1.5) was significantly greater than FCR in all other treatments. Proportion of lipids in fish fed three times per day was significantly greater than in fish from other treatments. Ultrastructure of muscle of fish offered feed three times daily had a better organized appearance and better defined striation than muscle of fish in other treatments. Accordingly, feeding rabbitfish three times daily is better than feeding them once or twice daily and also improves muscle ultrastructure and quality. 相似文献
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Abstract.— A 6‐wk feeding study was conducted to determine the effect of feeding frequency on growth rate of juvenile Norris and NWAC103 channel catfish, Ictalurus punctatus, reared under laboratory conditions. Four replicate groups of Norris and NWAC103 catfish (average weight of 4.0 ± 0.2 g/fish, SEM) were fed to visual satiety at different feeding frequencies (one, two, or three times daily). The percent of total daily food consumed for Norris catfish fed three times daily (0800, 1200, and 1600 h) was 44.4, 27.7, and 27.9%, respectively, while NWAC103 catfish consumed 42.9, 26.7, and 30.4%, respectively. Specific growth rate and feed intake were higher in fish fed three times daily compared to fish fed once and twice daily for both strains. Feed efficiency was reduced in NWAC103 fed three times daily compared to fish fed once or twice, while feed efficiency was similar among the Norris treatments. Gastrointestinal (GI) tract index ([weight of GI tract/weight of fish] × 100) decreased in NWAC103 catfish as feeding frequency increased, while a similar nonsignificant trend was also observed in Norris catfish. The results of this study demonstrate that aquarium‐reared Norris and NWAC103 catfish fed three times a day consume more feed and gain more weight than catfish fed once or twice a day. The observed decrease in the GI index as a result of feeding more frequently demonstrates that the size of the GI tract increases, relative to body weight, when catfish are fed only once a day. Under laboratory conditions, the number of times a day the fish are fed should be considered when trying to maximize growth of NWAC103 and Norris strains of catfish. 相似文献
14.
Effects of Replacing Fish Meal with Soybean Meal in Diets for Red Drum Sciaenops ocellatus and Potential for Palatability Enhancement 总被引：3，自引：1，他引：3
Two 8-wk feeding trials were conducted with juvenile red drum to determine the maximum levels of soybean meal that may replace fish meal in diets containing 38% crude protein, without reducing weight gain. In the first experiment, fish fed diets containing up to 90% of the protein from soybean meal gained as much weight as fish fed a diet with 100% of protein from fish meal, but fish fed the diet with 100% of its protein from soybean meal gained significantly (P < 0.05) less. Supplementation of glycine and fish solubles individually at 2% (as-fed basis) in diets containing 90% of their protein from soybean meal tended to increase weight gain of fish compared to those fed a similar diet without supplementation. Similar results were obtained in the second experiment, as fish fed diets containing 90% of their protein from soybean meal gained as much weight as fish fed a diet with 100% of its protein from fish meal. Fish fed diets with 95% and 100% of their protein from soybean meal gained significantly less weight than those fed the diet with all of its protein from fish meal. Supplementation of glycine at 2% in the diet containing 95% of its protein from soybean meal significantly improved weight gain of fish relative to those fed a similar unsupplemented diet. Supplementation of fish solubles at 5% of diet on a dry-matter basis provided a nonsignificant increase in weight gain compared to that of fish fed a similar unsupplemented diet. In both experiments there was greater observed consumption of the soybean-meal-based diets than diets with all of their protein from fish meal. A minimum of 10% of protein from fish meal appears necessary in practical diets containing most of their protein from soybean meal to prevent impaired growth and feed efficiency of red drum. 相似文献
15.
Ali E. Abdelghany Mohamed-Salah Ayyat Mohammed H. Ahmad 《Journal of the World Aquaculture Society》2002,33(3):307-315
In an attempt to identify appropriate times for initial application of supplemental feed in polyculture fertilized fish production earthen ponds, a study was conducted for 19 wk to establish the growth performance, yield, survival, and body composition of Nile tilapia, common carp, and silver carp as influenced by four different feeding regimens (treatments). The four treatments were: 1) supplemental feeding beginning at onset of the experiment (T-I) (control treatment); 2) 6-wk delay of feeding after fish stocking (T-II); 3) 13-wk delay of feeding after fish stocking (T-III), and 4) no supplemental feed application (T-IV). Two ponds were assigned to each treatment and each pond was stocked with a similar number and weight of each fish species. A commercial pelleted fish feed (25% protein) was used to feed fish in T-I, T-II, and T-III at 3% of their body weight, twice a day. At the end of the experiment, fish species (except for silver carp) in T-II showed weight gain, growth rates, and yields significantly higher than fish in T-III or T-IV. Also, the total fish production and net profit in T-II were significantly higher than in T-III or T-IV. Fish species in T-II showed weight gain, growth rates, survival rates, and yields similar to those of T-I (control treatment) with no significant differences. The amount of feed consumed by fish in T-II was reduced by approximately 7.3% compared to that consumed by fish at T-I. Moreover, there was increase in th net profit in T-II by 4.8% over that achieved in T-I. Therefore, T-II appears to be the most appropriate among the tested feeding treatments and recommended for use in order to achieve the best growth, production, and net profit. 相似文献
16.
P. B. Brown R. Twibell Y. Jonker K. A. Wilson 《Journal of the World Aquaculture Society》1997,28(3):215-223
Juvenile hybrid striped bass Morone saxatilis×M. chrysops were fed practical diets containing graded levels of either solvent-extracted soybean meal, roasted soybeans, or raw, unprocessed soybeans. Two separate 10-wk studies were conducted; within each study, there were two separate evaluations of soy products. In the first study, weight gain and feed efficiency of fish fed 45% or higher levels of soybean meal were significantly lower than fish fed the positive control diet, while weight gain and feed efficiency of fish fed 30% soybean meal were not significantly different than fish fed the control diet. Fish fed the lowest level of unprocessed soybean (20%) exhibited significantly depressed weight gain and feed efficiency compared to fish fed the control diet. In the second study, weight gain and feed efficiency of fish fed 40% roasted soybeans were significantly lower than fish fed the control diet, but weight gain and feed efficiency of fish fed 20% roasted soybeans were not significantly lower than fish fed the control diet. In both studies, whole body proximate composition values were significantly different among treatments. Whole-body lipid concentrations were significantly higher in fish fed certain levels of soy products, but only at levels above those eliciting depressions in weight gain and feed efficiency. A further evaluation of solvent-extracted soybean meal was conducted with incorporation levels of 20–40% of the dry diet in gradations of 5% with a nutritionally complete mineral premix. Weight gain and feed efficiency of fish fed any level of soybean meal in that study were not significantly different from fish fed a positive control diet. Whole body proximate components were not significantly different between treatments. Unprocessed soybeans apparently have little potential as an ingredient in diets fed to juvenile hybrid striped bass; roasting, or heat treatment, improves their use. Solvent extracted soybean has the potential of supplying the majority of crude protein in diets fed to juvenile hybrid striped bass. Incorporation of complete mineral premixes seems beneficial with higher levels of solvent-extracted soybean meal. 相似文献
17.
Heidi A. Hill Jesse T. Trushenski Christopher C. Kohler 《Journal of the World Aquaculture Society》2013,44(1):124-132
Soluble canola protein concentrate (SCPC) is rich in glutamic acid and may act as a feed attractant to improve feed acceptance and production performance of fish fed plant‐based diets. In the first experiment, attractant properties of SCPC were evaluated by comparing production performance of sunshine bass, Morone chrysops × Morone saxatilis, fed reduced fish meal (FM) diets supplemented with 1% SCPC or a betaine‐based feed attractant. In the second experiment, production performance of fish was compared after feeding reduced FM diets with or without SCPC. Following the first experiment, production performance was similar among fish fed attractants, but at 0% FM weight gain and survival were significantly lower compared to the 30% FM control treatment regardless of attractant inclusion. According to broken‐line analysis of data from the second experiment, the critical breakpoints in dietary FM inclusion rates needed to achieve maximal weight gain were similar regardless of SCPC. However, weight gain observed among fish fed SCPC was significantly greater than fish not fed SCPC. Including FM in plant‐based sunshine bass diets at rates >10–13% dry matter did not improve weight gain, and weight gain is optimized when a feed attractant/palatant such as SCPC is included in these plant‐based diets. 相似文献
18.
Menghe H. Li Edwin H. Robinson Daniel F. Oberle Brian G. Bosworth 《Journal of the World Aquaculture Society》2006,37(4):370-377
A factorial experiment was conducted to examine effects of dietary protein concentration (24, 28, 32, or 36%) and feeding regimen (feeding once daily or every other day [EOD]) on channel catfish, Ictalurus punctatus, production in earthen ponds. Compared with fish fed daily, fish fed EOD had lower feed consumption, weight gain, net production, and percentage of market‐size fish but had high feed efficiency and required fewer hours of aeration. Fish fed EOD also had lower carcass yield, fillet yield, and visceral and fillet fat. There was a significant interaction between dietary protein and feeding regimen for weight gain. No significant differences were observed in weight gain of fish fed daily with diets containing various levels of protein, whereas weight gain of fish fed EOD with a 24% protein diet was lower than those fed EOD with higher protein diets. Results suggest that response of channel catfish to dietary protein levels depends on whether the fish were fed daily or EOD. Feeding EOD to satiation improved feed efficiency and required less aeration compared with fish fed daily but also reduced net production and processing yield; therefore, EOD feeding should be examined closely before implementation. 相似文献
19.
Kofi Fynn-Aikins Silas S. O. Hung Steven G. Hughes 《Fish physiology and biochemistry》1993,12(4):317-325
Juvenile white sturgeon (Acipenser transmontanus) were fed three isonitrogenous and isoenergetic diets containing either 35% D-glucose (HC), a mixture of 20% dextrin and
10% cellulose (MC), or 23% cellulose (LC), to investigate the effects of dietary carbohydrate on liver function. After 8-week
feeding, body weight gain of fish fed the HC diet was consistently higher than that of fish fed the MC and LC diets, but was
not significantly different from the MC-fed fish. Fish fed the HC diet had significantly (p < 0.05) higher feed efficiencies
and liver glycogen concentrations than fish fed the MC and LC diets. Sturgeon were injected intravenously with 10 mg kg-1 body weight of sulfobromophthalein (BSP) and post-injection blood taken from the caudal vein at 15, 30, 60, and 120 min.
No significant differences in plasma BSP concentrations were found among the treatments at these times. Plasma hemoglobin
and activities of aspartate and alanine aminotransferase were not affected by the diets. This study suggests that the HC diet
does not adversely affect liver function or weight gain. Inclusion of high dietary levels of digestible and inexpensive carbohydrates
in commercial sturgeon feeds seems promising, but long-term feeding trials should be conducted to confirm this assertion. 相似文献
20.
Dagoberto R Sánchez Joe M Fox Delbert Gatlin III Addison L Lawrence 《Aquaculture Research》2014,45(8):1367-1379
This study was conducted to evaluate whether phospholipids have the potential to reduce the level of dietary fish oil inclusion in shrimp feeds in the presence and absence of phytoplankton. To do so, weight gain of juvenile Litopenaeus vannamei stocked at 80 shrimp m?2 fed different dietary levels of fish oil and soybean lecithin was determined. Six experimental 35% protein diets were formulated to contain 1%, 2% or 3% fish oil combined with either 1% or 4% soybean lecithin. Dietary effects were evaluated using a ‘clear‐water culture system’ without the presence of microalgae in 40‐L aquaria and a ‘green‐water culture system’ in 1.9‐MT tanks. After an 8‐week feeding period, shrimp cultured in both systems and fed diets containing 4% soybean lecithin had greater weight gain than those fed 1%. Thus, diets supplemented with phospholipids improved the efficiency of lipid utilization for growth: diets containing 1% fish oil in combination with 4% soybean lecithin can be used as a cost‐effective combination for commercial shrimp culture feeds. Weight gain in the green‐water system was 1.5–1.7 times greater than that for shrimp reared under clear‐water conditions, suggesting that phytoplankton contributes to shrimp growth through the continuous provision of nutrients. 相似文献