搜索结果: 151-165 共查到“知识库 水产养殖学”相关记录2720条 . 查询时间(1.453 秒)
通过研究恩诺沙星与环丙沙星在泥鳅体内的残留和消除规律,为水产养殖业提供合理的给
药方案和休药期。试验前,从养殖场购买的泥鳅在试验水质条件下暂养 7 d 后,分成 3 组投放入不
同水温的养殖系统中。以恩诺沙星与环丙沙星作为目标化合物,以拌料给药的方式,按 20 mg/kg
鱼体重的剂量每天投喂 1 次,连续投喂 7 d 后,对 15、20、25℃ 3 种水温条件下,目标化合物在
泥鳅体内的...
气相色谱-质谱法测定渔业水质中8种除草剂的残留量
除草剂 渔业水质 气相色谱-质谱法 检测
2015/12/2
本研究建立了测定渔业水质中氟乐灵、二甲戊灵、甲草胺、乙草胺、丁草胺、西玛津、莠
去津、扑草净 8 种除草剂残留量的气相色谱-质谱法。样品用氯化钠调节盐度至 20−30,二氯甲烷提
取,无水硫酸钠除水,过弗罗里硅土固相萃取小柱净化,利用气相色谱-质谱法,以选择离子监测
模式检测,外标法进行定量分析。采用基质匹配标准溶液校准法,8 种除草剂在 0.010−1.000 μg...
复合酶提取法对浒苔(Enteromorphasp.)膳食纤维吸附能力的影响
浒苔 膳食纤维 吸附能力
2015/12/2
针对丰富的浒苔资源还未得到有效利用的现状,以浒苔为原料,采用复合酶提取法制备浒
苔膳食纤维。浒苔在 55℃、pH=7.7的条件下,由不同比例的蛋白酶和纤维素酶(5:1、10:1、15:1、
20:1 和 25:1)配制的复合酶进行酶解,提取膳食纤维,测定不同提取条件得到的浒苔膳食纤维在模
拟体内的环境下(pH=2.0 和 pH=7.0)吸附葡萄糖、胆固醇和亚硝酸盐的能力。结果显示,随着复合
...
北部湾鲔(Euthynnusaffinis)的摄食习性及其随生长发育的变化
鲔 摄食习性 性腺发育
2015/12/2
基于2008年9月2009年9月在北部湾逐月采集的435尾鲔(Euthynnusaffinis)生物学数据,
对鲔生长、摄食习性及其随生长发育的变化进行了分析。结果显示,北部湾鲔属于广食性鱼类,主
要摄食中上层小型鱼类,另外还包括底栖鱼类、甲壳类和头足类等。少鳞犀鳕(Bregmaceros
rarisquamosus,45.50%)、青带小公鱼(Stolephoruszoll...
Genetic characteristics of Polish whitefish (Coregonus lavaretus maraena) broodstocks – recommendations for the conservation management
aquaculture genetic monitoring population
2015/7/7
This manuscript describes a study, in which microsatellite DNA analysis was applied to investigations into the
genetic structure of two whitefish broodstocks maintained in Poland (Pomorska Bay...
Structure of 0+ juvenile fish assemblages in the modified upper stretch of the River Elbe, Czech Republic
YOY fish fish reproduction regulation
2015/7/3
In August 2007, the 0+ juvenile fish assemblage of the upper River Elbe was surveyed using electrofishing. Thirty-six localities were sampled along a 177 km long section between the towns of Verdek an...
Sperm morphology, ultrastructure, and motility in pikeperch Sander lucioperca (Percidae, Teleostei) associated with various activation media
spermatozoa motility spermatozoa velocity calcium
2015/7/3
Spermatozoa morphology, ultrastructure, and spermatozoa motility traits were studied in pikeperch (Sander lucioperca) after activation in various media (AM 1 ?45mM NaCl, 5mM KCl, 20mM Tris, pH 8.5; AM...
Chemical induction of haploid gynogenesis in sterlet Acipenser ruthenus
sturgeons chromosomal manipulation dimethyl sulfate
2015/7/2
Chromosomal manipulations in sturgeons, particularly gynogenesis, are interesting due to the potential to change female ratio in progeny that can be useful for caviar production. The optimization of U...
P歟ni鑛a M.: Isolation and cryopreservation of early stages of germ cells of tench (Tinca tinca)
germ cells isolation transplantation
2015/7/2
A practical technique for isolation and cryopreservation of tench (Tinca tinca) (Cyprinidae,
Teleostei) early stages of germ cells (GC), including spermatogonia and spermatocytes, is reported for the...
Numerical modeling of aquaculture dissolved waste transport in a coastal embayment
Effluent pollution Dispersion Aquaculture Numerical modeling Plume dynamics Coastal engineering
2015/6/30
Marine aquaculture is expanding rapidly without reliable quantification of effluents. The present study focuses on understanding the transport of dissolved wastes from aquaculture pens in near-coastal...
不同养殖密度下革胡子鲶幼鱼的生长和垂体GH基因mRNA表达分析
日增质量 生长激素 半定量RT-PCR
2015/7/15
革胡子鲶(Clarias gariepinus)幼鱼在35 k•m-3、65 kg•m-3、95 kg•m-3和125 kg•m-3的密度下养殖60 d,第30和第60天时分析鱼的日增质量并应用半定量RT-PCR法分析垂体生长激素(GH)基因mRNA的相对表达量。0~30 d养殖期内,35 kg•m-3和65 kg•m-3密度...
不同光照强度对鲢、草鱼的诱集效果研究
诱集效果 鲢 草鱼
2015/7/15
为研究船闸中灯光诱驱鱼技术,观察了不同强度光源对鲢(Hypophthalmichthys molitrix)、草鱼(Ctenopharyngodon idellus)的诱集效果。结果表明,与对照组(无光源)相比,有光组的草鱼在暗区的平均相对时间聚集率[R(t)]均明显升高。随着光源强度的增加,各组中暗区的R(t)变大,鱼的群体重心位置与光源的距离也随之变大,草鱼总体上表现出一定的负趋光性。所有组次...
Limnological changes in a pond ecosystem caused by grass carp (Ctenopharyngodon idella Val.) low stocking density
aquatic macrophytes water and sediment chemistry phytoplankton
2015/6/8
Grass carp (Ctenopharyngodon idella Val.) stocked (29 kg/ha) in a small pond reduced the biomass of aquatic macrophytes from 109 g/m2 to 33 g/m2 during one growing season. The only changes in hydroche...
The effect of transport on biochemical and haematological indices of common carp (Cyprinus carpio L.)
erythrocyte profile common carp Cyprinus carpio
2015/6/8
The effect of 12 h transport on the biochemical and haematological profiles of three-years-old common carp was investigated. There was a significant increase (P < 0.01) in ammonia, chloride, phosphoru...
The error associated with the prediction of digestible protein contents of fish diets from tabulated values
fish diets protein digestibility coefficients prediction
2015/6/8
Numerous species available for culture, and lengthy, tedious and demanding digestibility experiments necessitate the use of tabulated values to calculate the apparent digestible nutrient contents of c...