A cost-benefit analysis of a public labelling scheme of fish quality

The purpose of this paper is to introduce a new method capable of evaluating the economic welfare for quality graded fish products using the hedonic price method for plaice in Denmark. Today, no labelling scheme exists for the final consumers of different qualities of fish. A scheme only exists at the first hand market. On this basis, a general applicable, theoretical and empirical method is developed to compare the costs and benefits of the hypothetical choice between the total absence of labelling and the presence of a public labelling scheme, which fully informs consumers on the quality and simultaneously allows the producers to differentiate prices between quality grades. It is shown that the economic welfare associated with a public labelling scheme is at minimum €263,000. Sensitivity analysis shows that this result is robust. The policy implication is that a public labelling scheme should not be implemented as the demand and cost functions have low elasticities, implying that the welfare gain is low.     

水源生态涵养区的鱼文化产业双螺旋发展模式一一以北京市密云县为例

水源生态涵养区发展亟需模式创新来协调生态保护与经济发展之间的矛盾。论文立足于生态涵养区的发展现状和功能定位,提出文化公益链和产业盈利链耦合的鱼文化产业双螺旋发展模式,并从资源盘活、业态融合、效益共赢等方面对该模式进行分析阐释。文章以北京市密云县为案例表明,该模式可以获得生态、经济、社会文化的综合效益,是水源生态涵养区的一种有效发展模式。     

不同规模淡水鱼养殖投入产出比较分析——基于淡水鱼养殖成本收益面板数据的实证研究

淡水鱼养殖在我国水产业中占有非常重要的地位,深人研究淡水鱼养殖的投人产出情况具有重要意义。本文利用历年全国农产品成本收益资料汇编数据对不同规模养殖户——规模户和一般户的投入产出进行比较和经验验证,分析结果表明：淡水鱼单位面积养殖产值由资本、劳动力和技术进步决定;资本和技术对规模户的促进作用要高于一般户,而劳动力对一般户的单位面积产值具有明显的正面影响。     

养殖户参与渔业专业合作社的意愿及影响因素——基于广西壮族自治区96户养殖户的调查分析

为了解我国淡水养殖户参与专业合作社意愿的影响因素,基于养殖户广西壮族自治区96户养殖户的调查数据,运用二元Logit模型对养殖户参与渔业专业合作社的意愿及其影响因素进行计量分析。结果表明:教育水平的影响达到了90%的显著水平;是否了解合作社,养殖历史和养殖面积达到了95%的显著水平;是否参加过职业培训和政府是否积极引导合作社的建立达到了99%的显著水平,以上是影响养殖户参与渔业专业合作社的关键因素。基于此,政府应加大对养殖户人力资本的投入并积极引导渔业合作社的建立,鼓励水产"大户"牵头创办专业合作社,鼓励养殖户加强交流与学习。     

浅析三江侗族腌酸鱼的工艺研究

腌酸鱼是广西三江侗族自治县传统而著名的食品,其主要以鲤鱼为原料,以糯米等为辅料经加工发酵而成,集酸、甜、辣、麻、咸、鲜为一体,口感细嫩,味道鲜美,香气四溢。但传统的腌制方法时间太长,盐浓度过高,腌制过程缺少现代食品理论指导。本文采用正交试验设计,通过对蛋白质的分解速率及氨基态氮含量的分析,确定20d为最合理的快速熟成期。并研究了姜蒜、酒糟、食盐和葡萄糖对快速腌制酸鱼的影响,结果表明:姜蒜、酒糟、食盐和葡萄糖的用量为鱼体用量的2%,150%,4%,2%是制作腌酸鱼的最快组合。     

淡水养殖效益低下的原因及改善途径

近年来，淡水养殖效益平均每年以10％－15％的速度下滑，严重挫伤了从业者的积极性。本文主要从渔业引导体系、生产经营、产品转化、产业结构、病害防治等5个方面分析造成效益低下的原因，并提出相关改善途径。     

挖塘养鱼现象与耕地保护

耕地保护是我国一项必须长期坚持的基本国策,但挖塘养鱼现象在农村屡禁不止,对耕地造成严重破坏。本文基于阳春市河口镇金堡区的调查,分析其不断扩大的挖塘养鱼现象,探究其发展原因及存在问题。切实保护耕地,必须完善土地管理的相关法律制度,引导农业经济发展,提高农户的耕地保护意识。     

Change and diversity in smallholder rice–fish systems: Recent evidence and policy lessons from Bangladesh

Efforts to unlock the genetic potential of both rice and fish, when combined with improvements in the management of rice–fish systems, can potentially increase agricultural productivity and food security in some of the poorest and most populous countries in Asia. In Bangladesh, estimates suggest that the country’s potential rice–fish production system encompasses 2–3 million hectares of land. But despite three decades of research on biophysical and technical aspects of rice–fish systems, this potential has not been fully realized due to insufficient attention given to the social, economic, and policy dimensions of rice–fish system improvement. This paper provides a characterization of the diverse and changing nature of rice–fish systems in Bangladesh to shed new light on the economic viability of different rice–fish systems and recommend policy and investment options to accelerate the development of appropriate rice–fish technologies. Data are drawn from a novel subdistrict-level survey of fishery officers, a household/enterprise survey, focus group discussions, and a meta-review of the literature on aquaculture in the country, all of which were conducted in 2010–2011. Findings indicate that concurrent rice–fish systems, alternating rice–fish systems, and collectively managed systems offer considerable potential for increasing productivity and farm incomes in Bangladesh. Findings also suggest that while innovation in these rice–fish systems is being driven by households and communities, there is need for more supportive government policies and investments to enable further innovation. Policymakers need to develop effective regulations to promote feed and fish quality and quantity, for example. More rigorous analysis of the intended and unintended impacts of these policies and investments is also necessary.     

Meat and fish consumption patterns in Saudi Arabia

This study analyses the demand for meat (beef, chicken and lamb) and fish in Saudi Arabia in a system-wide framework using data for the period 1985–2010. A preliminary data analysis reveals that, in Saudi Arabia, the relative consumption of beef, chicken and fish has a positive growth, while lamb has a negative growth. The average relative price growth rates of beef, chicken and fish are negative, while that of lamb is positive. The expenditure shares of beef, chicken and fish have increased while that of lamb has fallen. The estimation results of the demand system reveal that there is an autonomous trend out of lamb into beef, chicken and fish. The implied income elasticities indicate that beef, lamb and fish are considered to be luxuries, while chicken is a necessity. The demand for all meat products and fish are price inelastic. These elasticities are key inputs for policy analysts in terms of devising policies in relation to meat production, meat imports, taxation and food security issues in Saudi Arabia. The usefulness of the implied elasticities is demonstrated by simulating the consumption of beef, chicken, lamb and fish under various policy scenarios.     

Price volatility of south-east fishery's quota species: an empirical analysis

This study investigates the autoregressive conditional heteroscedasticity (ARCH) and generalized-ARCH (GARCH) effects in the price series of Australian South-East Fishery's quota species. It is found that in all cases significant ARCH and/or GARCH effects are present. To search for the origins of these effects a weakly exogenous variable (trading volume) is introduced to the conditional variance equation of the ARCH and GARCH models, provided that such effects are observed in the first stage of investigation. It is found that in 14 cases the estimated coefficients of the trading volume are negative. In all cases, the 'trading volume' variable does not contribute to the removal of the ARCH and/or GARCH effects. Finally, the policy implications of the findings are discussed.