世界大宗淡水鱼生产现状及特点

近半个世纪以来,世界大宗淡水鱼产业发展迅速,不仅产量显著增长、产值不断提高,并且在结构和模式上发生明显变化.我国是世界上第一大大宗淡水鱼生产国和消费国,世界大宗淡水鱼生产情况需要我们认真研究和把握.本文概述世界大宗淡水鱼产业发展的现状,从产量产值、获取结构、品种结构、地区结构等方面总结产业发展的特点和趋势,并考察中国大宗淡水鱼生产在世界的位置,为我国大宗淡水鱼产业的科学发展提供参考.     

黑龙江省泥河水库鱼类区系组成和种群分布

泥河水库是位于黑龙江省呼兰,兰西和绥化地区交界处的一座大型平原型水库,建立1958年1997年,作为省科委重大科技攻关项目的研究基地,开发其渔业资源,通过1998和1999年的调查研究,泥河水库共有鱼类21种,主要经济鱼类有6种,分别隶属于4目8科21属,区系组成分别属于5个区系复合体。     

休宁县传统山泉流水养鱼池的微观生态与美学价值

休宁县传统山泉流水养鱼池是一种开放且自成体系的特殊生态系统,具有丰富的生态环境多样性、物种多样性和遗传多样性。鱼池依山傍水、就地取材而建,完美地镶嵌在林间旱地、溪泉两侧、村落民居中,尽显人文与自然生态和谐之美,是一种古老而先进的养殖设施。利用山区充沛的流水和饲草资源,产出极高品质的水产品,依靠复杂完善的生态链和食物网系统高效清除养鱼污染。其强大的生态功能和深厚的美学人文价值,对现代设施渔业以及城市景观建设具有积极的指导和借鉴意义。     

Multiple Inference and Market Integration: An Application to Swedish Fish Markets

This paper, in contrast to earlier studies, tests market integration using a methodology that accounts for the multiplicity problem inherent in testing several time series. This method minimises the risk of finding spurious evidence of market integration. We examine market integration among 12 fish species in Sweden by applying cointegration tests, which identify market integration for two separate clusters of species. Furthermore, we find that the Law of One Price holds for 6 of the 12 species considered.     

中国海洋渔区“三渔”问题的突围之途

从实现海洋开发可持续发展看,化解"三渔"问题具有重要性和紧迫性。论文利用系统研究方法对"三渔"问题的子系统渔业、渔民、渔村问题的本质进行归纳分析。研究表明,渔业生产过密化、渔民粘连化、渔村过疏化是"三渔"问题的系统性特征,而化解"三渔"问题应当从建设和谐海洋社会,特别是通过现代渔业转型、渔村重生及渔民市民化转型等思路来解决。     

Product Differentiation with Credence Attributes and Private Labels: The Case of Whitefish in UK Supermarkets

The retail market for seafood is dynamic with substantial competition both amongst retailers and between private labels and national brands. New product attributes are added in attempts to differentiate products and to attract consumers. Credence attributes, in particular those related to eco‐labels and fishing method, have become more common. But little is known about how these and other credence attributes are valued in the retail market. In addition, little is known about price differences between private labels. To estimate the value of these attributes, weekly in‐store observations of selected frozen whitefish products were conducted in seven UK retail chains in the city of Glasgow. An estimated hedonic model shows a substantial price premium for fishing method (line‐caught), a premium for both home (Scottish) and non‐home country of origin (Icelandic) and a premium for the Marine Stewardship Council eco‐label. An uncertified eco‐label owned by a large seafood manufacturer leads to reduced price. The study also reveals substantial price differences between private labels for whitefish. The results contribute new insights regarding opportunities for differentiation by credence attributes which may lead to more sustainable and effective resource use along the value chain for frozen whitefish.     

山区稻田养鱼发展思路探讨

本文分析了浙江省永嘉县山区稻田养鱼的特点、经验、存在的潜力与困难,提出了发挥山区资源优势和特色,促进稻田养鱼发展的思路,为条件类似的山区发展稻田养鱼提供参考.     

海南省森林溪流淡水鱼类地理分布研究

从海南岛森林溪流中采集到40种淡水鱼，分别隶属于5目15科34属；分析了昌化江水系、万泉河水系、南渡江水系的森林溪流淡水鱼类的分布特点；该区系属东洋区、华南亚区的海南岛分区，分属热带平原鱼类复合体、中印山区鱼类区系复合体、上第三纪鱼类区系复合体、江河平原鱼类区系复合体和北方平原鱼类区系复合体等5个区系复合体；分析了该区域生态环境形成的地史原因。提出了保护和利用该地区鱼类资源的建议。     

How does tourist monitoring alter fish behavior in underwater trails?

Nature based tourism is becoming more popular because it is perceived as a solution to the conflict between conservation and economic exploitation. Nevertheless, it is known to cause several effects. This paper reports findings whereby monitored tourism avoids triggering adverse effects for social cichlid fish species, Crenicichla lepidota. Measures used included aggression toward territorial intruders and the number of nests built in pristine reference areas for monitored and in non-monitored tourist areas. We observed suppressed aggressive behavior and suppressed nesting only in the non-monitored area. We conclude that by monitoring visits, and using techniques including avoiding stepping on the river bed, reducing the number of visitors, prohibiting fish feeding and protecting riparian vegetation, it is possible to avoid the enduring damage caused by nature tourism.