搜索结果: 136-150 共查到“知识库 水产养殖学”相关记录2697条 . 查询时间(3.397 秒)
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...
Evaluation of semen quality of endangered Caspian brown trout (Salmo trutta caspius) in different times of spermiation during the spawning season
sperm motility spermiation spawning season Caspian brown trout
2015/6/8
Sperm motility and sperm production as well as organic and inorganic components present in the seminal plasma were measured at different time periods of spermiation during the spawning season in order...
Fish community structure of the middle course of the Bečva River
weirs fish species Beč va river Czech Republic
2015/6/5
Fish communities of the Bečva River were studied in summer and autumn 2000 and 2001. Electric fishing gear (Honda EX 1000, DC 230 V, 0.75–0.9 kW) was used for sampling. Four sampling sites (Grymo...
Fish Communities in the Poodří Protected Landscape Area (the Odra River basin)
fish communities Odra River Poodř í PLA floodplain
2015/6/5
The Odra River, 55.2 kmof its length, is winding through the Poodří Protected Landscape Area, which has total area of 81,5 km2. More than 80% of its stream has retained the natural cha...
时滞差分模型与剩余产量模型的应用比较——以南大西洋长鳍金枪鱼为例
剩余产量评估模型 时滞差模型
2015/7/15
将剩余产量模型和时滞差分模型分别应用于南大西洋长鳍金枪鱼（Thunnus alalunga）渔业数据，结果表明，比起剩余产量模型，时滞差分模型拟合的单位捕捞努力渔获量（catch per unit effort，CPUE）曲线能够更好地捕捉到CPUE随着时间的波动。赤池信息量准则（Akaike information criterion，AIC）的结果显示，时滞差分模型比Schaefer模型的评估...
氮、磷、铁质量浓度对绿色颤藻生长的限制性条件
铁 叶绿素 干质量
2015/7/15
绿色颤藻（Oscillatoria chlorine）在虾池中大幅度增加时会释放微囊藻毒素，给对虾的健康养殖带来危害。文章分析不同质量浓度的氮（N）、磷（P）、铁（Fe3+）对绿色颤藻叶绿素a和藻体质量浓度的影响，探讨水中N、P、Fe3+ 的质量浓度对绿色颤藻生长的限制性条件。结果显示，限制绿色颤藻叶绿素a质量浓度增加的条件是ρ(N)<0.06 mg•L-1，ρ(P)<9.93×10-...
Repeated administration of different hormonal preparations for artificial propagation and their effects on reproduction, survival and blood biochemistry profiles of female tench (Tinca tinca L.)
tench artificial propagation hormonal stimulation haematology biochemistry profile
2015/6/4
The aim of the study was to compare physiological statuses of stripped and not stripped tench females with ovulation induced by GnRHa or carp pituitary extract (CPE). The comparison was based on selec...
Slaughter yield, proximate composition, and flesh colour of cultivated and wild perch (Perca fluviatilis L.)
Perca fluviatilis slaughter yield proximate composition flesh colour
2015/6/4
The aim of this research was to determine the slaughter yield, proximate composition, and flesh colour of cultivated and wild perch (Perca fluviatilis). The study material was composed of fish obtaine...