菜籽饼的发酵脱毒及酶酸法水解制备复合氨基酸工艺研究     

李燕  李政  汪华  陶兴无 《饲料工业》2011,32(8)

以菜籽饼为原料,选择黑曲霉、米曲霉、乳酸菌进行混合固态发酵,然后利用多菌种混合发酵中产生的蛋白酶进行菌酶水解试验,经55℃菌酶水解7 h,氨基酸含量达1.15 g/100 ml;然后,加适量盐酸,经95℃低酸水解8 h,氨基酸含量可达2.17 g/100 ml。本项目研究的生产复合氨基酸液的工艺集脱毒、菌酶、低酸水解为一体,能耗低、产率高,且氨基酸种类丰富齐全,为菜籽饼的综合利用开辟了一条新的途径。  相似文献   

Spatio-temporal patterns of parturition of the black rockfish Sebastes inermis in Sendai Bay, northern Japan     

Guido  PLAZA  Satoshi  KATAYAMA  Michio  OMORI 《Fisheries Science》2004,70(2):256-263

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BA-ELISA快速检测鱼源沙门氏菌的研究     

戴秉丽  王世若  宋耀彬  刘玉斌 《中国兽医学报》1990,(3)

本研究建立了快速检测鱼源沙门氏菌的BA-ELISA工作程序。该程序灵敏度为105个/mL,可经受108个/mL杂菌的干扰,对含有10个以上沙门氏菌的接种标本经21～23h两步增菌后即可检出,可在25～27h内报告结果,比常规分离培养方法缩短3～5d。从6个品种的498尾淡水鱼和7个品种的160尾海水鱼,共采集标本778份,以常规分离培养法检出29份阳性标本,分离率为3.7%。对包括该29份分离阳性标本在内的184份鱼源标本实施BA-ELISA的结果表明,两法的符合率为96.73%,BA-ELISA法的敏感性为100%(29/29),特异性为96.1%(149/155)。独立性检验表明,两法检测结果间有极显著意义的一致性(P<0.01)。血清学分型表明,分离的菌株全部为鼠伤寒沙门氏菌(1,4,5,12:i:1,2)。  相似文献   

水产动物微颗粒饲料加工工艺研究进展   总被引：1，自引：0，他引：1  

刘峰  艾庆辉  刘春娥 《饲料工业》2011,32(12)

水产动物幼体微颗粒饲料是近些年来国内外研究开发的热点,文中综述了国际上较为流行的几种微颗粒饲料造粒工艺,包括微黏合工艺、微包膜工艺、聚合反应工艺、相分离技术造粒工艺、物理机械法造粒以及混合法造粒工艺。微颗粒饲料制粒工艺是微颗粒饲料产业乃至水产育苗行业的关键技术,其进一步发展有赖于制粒工艺技术研究和水产动物幼苗营养及消化生理研究的综合进展。  相似文献   

A spatial linkage between dams and non-native fish species in Hokkaido, Japan     

M. Han  M. Fukushima  T. Fukushima 《Ecology of Freshwater Fish》2008,17(3):416-424

Abstract –  The native and non-native freshwater fish species richness as well as the proportion of native fish species to overall fish species were examined to test a hypothesis of a spatial linkage between the distributions of dams and non-native fishes based on survey data collected in rivers and streams in Hokkaido, Japan. Non-native fish species have steadily increased in Hokkaido since the mid 1970s, as indicated by the decreasing proportion of native fish species per fish survey. Non-native species richness was significantly higher in areas above dams (i.e., reservoirs and their inlet streams) compared to areas without dams. As a result, the proportion of native fish species was lower above dams. This proportion was lower in developed and agricultural areas compared with forest areas, although both native and non-native species richness were higher in areas with development and agriculture. Non-native cyprinids, catfish and snakehead occurred primarily in a particular river basin with the largest drainage area, the longest history of reclamation and highest human population in the island. Non-native salmonids on the other hand, occurred in forest areas at higher elevations and their occurrence was associated with the existence of dams. There was a spatial linkage between the distribution of dams and non-native species, although it was applicable only to salmonids. The management of dams and reservoirs needs a strategy to prevent further expansion of exotic salmonids such as rainbow and brown trout. These species can be a significant threat to native Japanese salmonids as a result of various biological mechanisms.  相似文献   

棉籽饼粕在水产养殖中的应用   总被引：1，自引：0，他引：1  

王裕玉  杨雨虹  刘大森 《中国饲料》2011,(2)

本文综述了水生动物对棉籽饼粕的应用情况及影响水生动物对棉籽饼粕利用的制约因素.  相似文献   

Economic profitability of Nile tilapia (Oreochromis niloticus L.) production in Kenya     

Aloyce R Kaliba  Charles C Ngugi  John Mackambo  & Kwamena K Quagrainie 《Aquaculture Research》2007,38(11):1129-1136

Economic profitability of Nile tilapia production in Kenya was analysed using a model that simulated individual fish growth and took fish population dynamics in the pond into account. The results suggest that the currently practiced mixed‐sex tilapia culture is economically unsustainable. It is suggested that research and extension efforts be geared towards developing monosex Nile tilapia production systems. Nile tilapia culture with African catfish predation should be viewed as an intermediate step towards all‐male Nile tilapia culture. This will allow accumulation of both physical and human capital to support all‐male tilapia culture. Under all‐male culture, economic returns are high enough to justify investment in Nile tilapia culture using borrowed capital. However, the success of monosex culture will depend on the availability and affordability of quality fingerlings and low‐cost fish feeds. The results have a wide application in Sub‐Saharan Africa where mixed‐sex Nile tilapia culture is common.  相似文献   

Movement patterns of armado, Pterodoras granulosus, in the Paraná River Basin     

M. C. Makrakis  L. E. Miranda  S. Makrakis  D. R. Fernandez  J. O. Garcia  J. H. P. Dias 《Ecology of Freshwater Fish》2007,16(3):410-416

Abstract –  We studied the migratory behaviour of armado, Pterodoras granulosus , in the Paraná River Basin of Brazil, Paraguay and Argentina, during 1997–2005. This species invaded the Upper Paraná River after upstream dispersal was facilitated when Itaipu Reservoir inundated a natural barrier. Fish were tagged ( N  = 8051) in the mainstems of the Yacyreta and Itaipu reservoirs, bays of major tributaries, the Paraná River floodplain above Itaipu Reservoir, and below dams. In all, 420 fish were recaptured of which 61% moved away from the release area. Fish moved a maximum of 215 km (mean 42), and at a maximum rate of 9.4 km·day⁻¹ (mean 0.6). Of the 256 armados that moved away from the release site, 145 moved upstream towards unimpounded stretches of the Paraná River and 111 moved downstream into the reservoir and bays of its tributaries (maximum 150 km). Based on the observed migratory movements, we suspect that most of the reproductive output originates in tributaries to the reservoirs. The ability of this species to expand its range presents a conundrum by pitting fishery management interests against conservation needs. Maintenance of the important armado fisheries depends on the ability of the species to migrate freely to use spawning and nursery areas in reservoir tributaries and floodplains. However, its ability to migrate long distances can allow this non-native species the opportunity to invade most of the Upper Paraná River.  相似文献   

Variability in feeding ecology of a South American cichlid: a reason for successful invasion in mediterranean‐type rivers?     

F. Ribeiro  R. L. Orjuela  M. F. Magalhães  M. J. Collares-Pereira 《Ecology of Freshwater Fish》2007,16(4):559-569

Abstract –  Ecological attributes behind the success of the South American cichlid Australoheros facetus in mediterranean-type rivers remain unclear. This study addresses this issue, by analysing its abundance and feeding patterns in the lower Guadiana drainage (Portugal), during the dry season of 2003. Despite slight spatial variations in abundance and individual size, A. facetus seemed well established in the Guadiana, Vascão and Ardila rivers. No seasonal or size-related changes in feeding intensity were found, but the diet changed across rivers, over time and throughout ontogeny. Feeding seemed highly generalist, with fish apparently reacting to both spatial and temporal changes in food supply and tending to use the most abundant and easily accessible food items. Overall prey breadth was broad relative to that of other native and non-native species. It is suggested that a generalist feeding strategy may play a significant role in the establishment of non-native fish in mediterranean-type rivers.  相似文献   

Seasonal dynamics and age structure of drifting cyprinid fishes: an interspecific comparison     

M. Reichard  P. Jurajda 《Ecology of Freshwater Fish》2007,16(4):482-492

Abstract –  We investigated interspecific differences in the downstream drift of seven species of young-of-the-year cyprinids over a 2-year period in two central European rivers, using a comparison of drifting fish with fish collected from nurseries at the same time and the same site as the drift samples. Species varied in the utilisation of the drift; Rutilus rutilus , Gobio spp., Abramis brama and Carassius auratus gibelio drifted abundantly, while Leuciscus cephalus and Alburnus alburnus were abundant in nurseries, but drifted at low densities. Abramis bjoerkna was equally represented among drifting and resident fish. Generally, fish drifted at two major developmental intervals; L3 stage and the stage at transition between larval and juvenile periods (L6/Juv), with interspecific differences in the ontogenetic timing of drifting. The propensity to drifting of certain developmental stages was also reflected in body size comparisons between drifting and resident fish. The stage-dependent drifting may be attributed to major changes in fish morphology, behaviour and swimming ability.  相似文献