排序方式: 共有55条查询结果,搜索用时 15 毫秒
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东海蓝点马鲛种群鉴别研究 总被引:3,自引:0,他引:3
东海海区的蓝点马鲛是否为同一种群,通过广泛采集样品--东海北部(30°30‘-3230’N),东海中部(28°30‘-30°30’N)和东海南部(26°00‘-28°30’N),共10批,计390尾,按三组作形态学测量,经差异系数(C.D),均数差异显著检验和聚类分析等处理,结果表明,分布在东海海区北、中、南部的蓝图点马鲛为同一种群。 相似文献
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María Dolores Garza-Gil Manuel Varela-Lafuente & Gonzalo Caballero-Miguez 《Aquaculture Research》2009,40(3):274-281
The Spanish aquaculture sector has undergone a rapid and continuous growth becoming one of the biggest European producers. A wide range of species are farmed and, among them, the sea bass, sea bream and turbot make a significant contribution to the total of the Spanish fish farming output. In this paper, we analyse and predict the medium-term trend of the production and price level for the three leading species previously mentioned. The results obtained show a significant increase in the production of sea bream, sea bass and turbot. The results show also a slight decrease in the sea bream average price, a stable trends for the sea bass and increasing prices for the turbot. 相似文献
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Raptors that consume game species may ingest lead fragments or shot embedded in their prey’s flesh. Threatened Spanish imperial eagles Aquila adalberti feed on greylag geese in southern Spain in winter, and often ingest lead shot. We analysed bone and feather samples from 65 Spanish imperial eagle museum specimens collected between 1980 and 1999, to investigate the prevalence of elevated lead concentrations. Four of 34 birds (12%) had very elevated bone lead concentrations. All four birds were young and the concentrations were outliers to the distribution, suggesting probable exposure to lead gunshot. Excluding these elevated lead outliers, bone lead concentrations were correlated with the bird’s age at death. Three of 41 feathers (7%) had elevated lead concentrations, indicative of high exposure during feather formation. When these outliers were omitted, feather lead concentration was correlated with the age of museum specimens, suggesting that a high proportion of feather lead was exogenous, deposited after specimen collection. Therefore, careful interpretation of feather lead concentrations is required to separate endogenous and exogenous lead. We discuss the potential significance of lead poisoning in Spanish imperial eagles and other raptors, and recommend measures for its reduction. 相似文献
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An innovative fresh-keeping method for aquatic products is presented in this article. Spanish mackerel (Scomberomorus niphonius) were treated with a high-voltage electric field (HVEF) at different voltages and times and then stored in a refrigerator at 4°C. Bacteria count, total volatile basic nitrogen (TVB-N), sensory index, proximate composition, and pH were measured to evaluate the fresh-keeping effect of the proposed method. Results indicate that HVEF can restrain bacteria growth, reduce TVB-N, and delay sensory score decline; and that 45 kV for 20 min is the optimal treatment parameter of HVEF for extending Spanish mackerel shelf life. Results also suggest a potential application for HVEF treatment in aquatic products preservation. 相似文献
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Shabbar Jaffry Sean Pascoe George Taylor Unax Zabala 《Aquaculture Economics & Management (Blackwell Science)》2013,17(3-4):157-167
Abstract The introduction and rapid expansion of farmed salmon production in the mid 1980s has transformed the international market for salmon. Spain is one of the most important markets for fish within Europe and the world, and has seen a substantial increase in its demand for salmon. As in other European countries, this has raised concerns that the increased supply of salmon to Spain may have detrimental effects on the market prices of traditional (wild‐caught) species. In this paper, the extent to which salmon competes with the main traditional fish species in the Spanish market is examined using market delineation methodologies. In particular, the potential interactions between species is examined in a multivariate cointegration framework. The results suggest that salmon is at best only a weak substitute for tuna, hake and whiting, but no significant interaction could be found. 相似文献
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为减少加工废弃物蛋白所造成的环境污染,提高水产品的利用率,探索了回收利用鲅鱼(Spanish mackerel)加工后富含蛋白质的废弃物,以寻找制备鲅鱼抗氧化肽的最佳生产条件。借助Design-Expert数据处理软件对苏云金芽孢杆菌Hy-4发酵产抗氧化肽的条件进行优化;在单因素试验的基础上,利用PlackettBurman试验设计法对影响发酵制备鲅鱼抗氧化肽的培养条件进行筛选。确定了影响发酵液总抗氧化活性的3个主要影响因素(P0.5)为发酵温度、培养基初始p H和料液比;在此基础上,利用最陡爬坡实验逼近3个关键因素的最大响应区域,再利用Box-Behnken试验设计及响应面分析法进行回归分析,通过求解回归方程得到产抗氧化肽的最优条件为:发酵时间48 h,发酵温度30℃,培养基初始p H 6.8,接种量2%,料液比1.45 g/50 m L,菌龄24 h。经过验证,发酵液总抗氧化活性达到537.73 U,较优化前提高了57.2%,与回归方程的预测值570.11 U相比,相对误差为5.7%,说明模型能够较好地预测菌株Hy-4发酵产抗氧化肽发酵液的总抗氧化性。 相似文献