全文获取类型
收费全文 | 453篇 |
免费 | 66篇 |
国内免费 | 25篇 |
专业分类
林业 | 2篇 |
农学 | 7篇 |
基础科学 | 9篇 |
18篇 | |
综合类 | 158篇 |
农作物 | 6篇 |
水产渔业 | 318篇 |
畜牧兽医 | 24篇 |
园艺 | 1篇 |
植物保护 | 1篇 |
出版年
2024年 | 4篇 |
2023年 | 10篇 |
2022年 | 21篇 |
2021年 | 24篇 |
2020年 | 21篇 |
2019年 | 24篇 |
2018年 | 18篇 |
2017年 | 23篇 |
2016年 | 22篇 |
2015年 | 17篇 |
2014年 | 23篇 |
2013年 | 32篇 |
2012年 | 30篇 |
2011年 | 26篇 |
2010年 | 21篇 |
2009年 | 23篇 |
2008年 | 17篇 |
2007年 | 27篇 |
2006年 | 28篇 |
2005年 | 13篇 |
2004年 | 14篇 |
2003年 | 12篇 |
2002年 | 8篇 |
2001年 | 12篇 |
2000年 | 11篇 |
1999年 | 16篇 |
1998年 | 9篇 |
1997年 | 7篇 |
1996年 | 13篇 |
1995年 | 8篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 1篇 |
排序方式: 共有544条查询结果,搜索用时 15 毫秒
11.
12.
阳澄湖养蟹网围内外轮虫群落结构的变化及分析 总被引:1,自引:0,他引:1
2008年6月至2009年5月对阳澄湖养蟹网围及湖区3组对照点中轮虫群落结构及部分水质特征参数进行调查,分析了轮虫群落结构与环境变量的关系,利用多种参数对其水质进行评价。经鉴定,共采集到轮虫83种,隶属于12科30属。研究表明,网围内3个采样点的年平均生物密度及生物量低于湖区3个采样点,生物密度与水温呈极显著正相关(P<0.01)。不同月份受不同环境变量的影响,除4月份外,环境变量对生物密度的影响在采样点之间无差异。相似度分析表明,网围内及相邻湖区的轮虫优势种相似性高。水质分析表明,6个采样点均为富营养化、β-α中污染水体,东湖网围C1和中湖网围A12采样点程度稍轻,但6个采样点之间无显著性差异,这与用卡尔森营养状态指数得出的结果相似。 相似文献
13.
Effect of dietary lipid levels on growth performance,fatty acid profile and enzymatic activity of juvenile swimming crab,Portunus trituberculatus 下载免费PDF全文
Tao Han Min Yang Xinyu Li Puqiang Zheng Chunlin Wang Jiteng Wang 《Aquaculture Research》2018,49(8):2664-2670
The main objective of this investigation was to study the lipid requirements of the early juvenile (C1) swimming crab (Portunus trituberculatus) based on growth performance, survival, moulting and fatty acid profile. Four test diets were formulated with graded lipid levels (3.63%, 6.70%, 10.72% and 13.91%). Each diet was fed to 4 replicates of crabs (30 crabs per replicate initial weight (8.4 ± 0.1 mg). In this study, crabs fed diets with 13.91% lipid had significantly (p < 0.05) higher survival than crabs fed with 3.63% lipid, but no significant (p > 0.05) improvement of survival was observed when dietary lipid increase from 6.70% to 13.91%. Crabs fed diets with 10.72% and 13.91% lipid had significant higher weight gain(WG) than crabs fed with 3.63% lipid. While crabs fed with diets containing 6.70%, 10.72% and 13.91% lipid showed no significant (p > 0.05) difference in weight gain(WG). Moreover, the lowest moulting number was observed in crabs fed diets with 3.63% lipid, but there was no significant difference (p > 0.05) among other groups. The content of LC‐PUFA and DHA in the crabs fed diets with 3.63% lipid was significant (p < 0.05) lower compared to other groups. But there was no significant (p > 0.05) difference in EPA and ARA content among all groups. The activity of lipase increased as dietary lipid level increased (from 6.70% to 10.72%). However, beyond 10.72%, a significant (p < 0.05) decreased in lipase activity was observed. The regression analysis of weight gain data indicated that crab fed diet containing 10.47% lipid level is considered as optimum lipid level for its maximum growth and moulting process. 相似文献
14.
Does the wild‐caught Chinese mitten crab megalopae perform better than the hatchery‐produced seed during the juvenile culture? 下载免费PDF全文
Xugan Wu Jie He Xiaodong Jiang Qing Liu Feng Gao Yongxu Cheng 《Aquaculture Research》2018,49(5):2042-2050
Although wild Yangtze Eriocheir sinensis juveniles (coin‐sized seed) have better culture performance than the pond‐reared juveniles during the adult crab culture stage, the culture performance of wild‐caught megalopae (WC) remains unknown. Therefore, this study was designed to compare the growth, survival rate, crab yield, feed conversion rate (FCR), precocity, final weight and size distribution between WC and hatchery‐produced megalopae (HP) during the juvenile culture stage. Wild‐caught megalopae had significantly higher body weight, weight gain rate (WGR) and specific growth rate (SGR) during 0–4 weeks but lower WGR and SGR than HP during 4–8 weeks (p < .05). Although WC had a significantly lower survival rate and yield of normal juvenile crabs than HP, total yields of normal juveniles and precocious crabs were similar. Wild‐caught megalopae had a significantly higher precocious rate and yield of precocious crabs than HP (p < .05). Regardless of sex, no significant differences were found in the gonadosomatic index (GSI), hepatosomatic index (HSI) and final weight of normal juveniles and precocious crabs between WC and HP. As for the size distribution of normal crabs, WC had a higher percentage of small female juveniles (<3 g) but a lower proportion of middle size ranges (3–5.99 g and 6–8.99 g) than HP for females (p < .05), and there was no significant difference for males. In conclusion, wild megalopae of the Yangtze E. sinensis had worse culture performance than the hatchery‐produced seeds; therefore, wild megalopae would not be recommended for commercially juvenile culture of E. sinensis. 相似文献
15.
Can genetic diversity be maintained during mass selection of the Chinese mitten crab,Eriocheir sinensis? 下载免费PDF全文
The Chinese mitten crab (Eriocheir sinensis) is an important aquaculture species and food source in Eastern Asia. This study assesses the changes in genetic diversity in successive generations of early‐ and late‐maturing strains of E. sinensis using 30 microsatellite markers with high polymorphism. The mean average number of alleles (N) in the founder population (G0), first generation (G1), second generation (G2) and third generation (G3) of the early‐maturing strain were 18.367, 14.800, 16.400 and 16.533, respectively; while in late‐maturing strain the values were 18.500, 16.267, 14.367 and 16.533 respectively. Likewise, there was a slight decline in average allelic richness (Rs) in the three successive generations. In both strains, the mean observed heterozygosity (Ho) remained relatively constant for the early‐maturing strain and the values were 0.655, 0.667, 0.685 and 0.705, respectively; and for the late‐maturing strain these were 0.665, 0.672, 0.688 and 0.702 respectively. Similarly, the expected heterozygosity (He) remained constant, ranging from 0.823 to 0.854. There was a decrease in effective population sizes (Ne) of the early‐maturing strain with successive generations: values were 492.2, 35.0, 134.7 and 193.2, respectively; while the values in the late‐maturing strain were 1268.5, 75.6, 111.5 and 97.2 respectively. All pairwise population distances were very close in both strains. In conclusion, these results suggest that mass selection of E. sinensis did not significantly diminish genetic diversity although there was a decline for the Ne. Therefore, it is important to maintain sufficient broodstock numbers and a large effective population when following a selective breeding programme. 相似文献
16.
Thottingal K. Anupama Sundarambal J. Laly Kesavan Nair Ashok Kumar Thazhakot V. Sankar George Ninan 《Journal Of Aquatic Food Product Technology》2018,27(4):531-541
Charybdis feriatus is a highly prized crab in the local and international markets of East Asian countries. In local markets, crabs are sold live, iced, or refrigerated at 2°C – 4°C. The present study was carried out to determine the shelf life of whole crab stored at 4°C for 192 h using a set of biochemical, microbiological, and sensorial parameters. Biochemical indicators such as the total volatile base nitrogen (TVB-N) and trimethylamine nitrogen (TMA-N) increased significantly during storage and within an acceptable limit up to 144 h. Regarding the biogenic amines, cadaverine and spermidine increased significantly (p < 0.05) during the storage period. Among them, cadaverine could be proposed as a useful spoilage indicator for this crab species. The mesophilic and psychotropic bacterial count exceeded the limit of acceptance after 144 h of storage. Sensory attributes were gradually diminished with the storage time. Sensory scores were found to correlate well with both mesophiles and psychrotrophs. Based on the results of this study, the meat quality of Charybdis feriatus can be maintained up to 144 h when properly stored at a temperature of 4°C ± 1°C. 相似文献
17.
Effects of different dietary vitamin E and astaxanthin levels on growth,fatty acid composition and coloration of the juvenile swimming crab,Portunus trituberculatus 下载免费PDF全文
Six isonitrogenous and isolipidic diets were formulated containing two astaxanthin (AX; 0 and 90 mg/kg) and three vitamin E (VE) levels (0, 25 and 50 mg/kg). There were three replicates (18 crabs per replicate) for each treatment. Juvenile swimming crab (initial weight 31.65 ± 0.06 g/crab) were fed different diets for 8 weeks. After the feeding trial, growth performance was not significantly affected by the different treatments. Crabs fed with AX‐supplemented diets showed more redness. Whole body 22:6n‐3, 22:4n‐6 and 20:5n‐3 levels increased with the dietary addition of AX (P = .009, P = .002 and p = .042, respectively). The malondialdehyde (MDA) concentrations of fresh/frozen hepatopancreas and frozen muscle were significantly decreased by the dietary AX supplementation (p < .001, p = .010 and p = 0.011, respectively). These findings provide evidence that dietary AX has an ability to improve the redness of the shell and reduce the MDA concentrations of tissues. Furthermore, there is no strong interactive relationship between dietary VE and AX on the coloration and fatty acid concentrations for the swimming crab. 相似文献
18.
Emilia T Quinitio Joana Joy dela Cruz‐Huervana Fe D Parado‐Estepa 《Aquaculture Research》2018,49(1):75-80
Starvation and exposure to formalin were investigated as possible stress tests for evaluating the quality of mud crab, Scylla serrata, larvae. For the starvation stress test, newly hatched zoeae stocked in 150‐ml containers were either starved or fed rotifers. Similarly, newly hatched zoeae were stocked in containers with seawater of 0 (control), 20, 30 and 40 mg/L formalin for the formalin stress test. The zoeae from the same batches were used for seed production to monitor their performance and validate the results of stress tests. Starvation was found to be unsuitable for larval quality evaluation. However, the impact of initial food deprivation on the newly hatched larvae indicates that feeding immediately after hatching is necessary for mud crab larvae. Exposure of larvae to 40 mg/L formalin for 3 hr appeared to be a reliable and practical method for larval quality assessment as the survival of larvae in the mass production tanks validated the classification of good and poor quality batches in the stress tests. On this basis, a hatchery operator can decide which batch should be cultured further. Finally, there appears to be a link between the quality of larvae and the performance at the megalopa and early juvenile crabs. 相似文献
19.
介绍了2000—2009年舟山市蟹笼渔业的捕捞力量与产量、产值的发展概况,主要生产渔场、渔期及渔获物组成的变化。分析研究了10年来蟹笼渔业产量变化的缘由,探讨了蟹笼渔业对三疣梭子蟹资源衰退的影响,并对舟山市蟹笼渔业存在的问题,提出了相应的管理建议。 相似文献
20.
Juana Durán Elena Pastor Amalia Grau José María Valencia 《Aquaculture Research》2012,43(12):1777-1786
The Mediterranean spider crab, Maja squinado, is depleted due to overfishing. The crab has virtually disappeared from areas where it was abundant, such as the Balearic Islands and the Catalan coast. Maja squinado, is economically and ecologically very valuable, and it is essential to obtain information on its biology and rearing conditions to attempt to repopulate the damaged stocks of the species in the Mediterranean basin. Herein, we describe the first successful rearing of M. squinado under laboratory conditions. Our results show that M. squinado is an excellent candidate for restocking using cultured juveniles. Two consecutive broods with a 1–4 day interbrood period were observed in the laboratory in wild‐caught females, the maximum observed duration of embryonic development of the egg mass being 32 days at 18.4 ± 0.9°C, and went through four different stages. The complete larval and first juvenile development was studied in laboratory cultures fed enriched Artemia metanauplius. At 19.6 ± 0.6°C, development from hatching to first crab moult took 17 days, and it comprised two zoeae stages and one megalopa stage. The survival rate at the different stages was monitored, and 7.13 ± 2.3% was achieved at the first crab instar. 相似文献