The Use of River Flow Data to Predict Low Flows as an Aid to Trout Farm Management

Advance knowledge of flow rate variations in the water supply to a spring-fed trout farm is of great value to the farm manager since the weight of stock that can be sustained at any one time is dependent on the discharge rate of the spring. Annual variations of flow rate in groundwater dominated streams and rivers follow a fairly regular pattern with a recession occurring from the highest flows in the spring to the lowest flows in the late summer and autumn. This paper describes a simple technique for predicting discharge rates during periods of recession. Use of the technique which is illustrated by data from Belleau springs in Lincolnshire would enable fish farm managers to obtain a conservative estimate of the flows during summer and autumn and give adequate forewarning of impending low flows.     

水产养殖业可追溯性管理与渔业可持续发展

正水产品是人类重要蛋白质来源,水产品经济也是全球渔业贸易的重要组成部分。近年来,由于过度捕捞以及生态环境的恶化,海洋渔业资源不断衰退,海洋捕捞产量逐年降低。据《The state of[1]     

Angling catch returns as indicators of the status of upland trout lakes

Abstract. Over the period 1966–1983 angling catches from the Penrhyncoch trout, Salmo trutta L., lakes in mid-Wales showed a steady decline while catches from the nearby Trisant lakes steadily increased. By the early-mid 1970s some of the Penrhyncoch lakes had ceased to exist as viable fisheries. The declining catches from many of the Penrhyncoch lakes appeared to be attributable to the recent acidification of the lakes which has led to a severe decline in the size of the native trout population and a high mortality among stocked hatchery-reared trout, Salmo trutta L. The increase in catches from the Trisant lakes appears to be due to a shift in angling pressure but the relatively high catches are a real reflection of high trout population densities in lakes unaffected by acidification. The average annual angling catch from the Penrhyncoch and Trisant lakes over 1966–1983 was 1·2 and 6·7 kg ha^?l respectively. Catches per unit area from the Trisant lakes compare favourably with other much larger upland reservoirs.     

湖泊渔业管理应处理好的几种关系

湖泊渔业管理是确保湖泊渔业健康发展的保证，而管理的关键在于如何处理各种关系，本文作者根据多年的实际工作经验，对在湖泊渔业管理者中普遍存在的一些认识误区进行了分析和阐述。     

国外休闲渔业可持续发展管理现状及我国休闲渔业管理对策

介绍了休闲渔业的兴起和发展以及在此过程中出现的环境、资源破坏等突出问题,论述了国外休闲渔业可持续发展管理现状,以提供我国休闲渔业管理借鉴.     

渔业协会、渔村社区组织及其渔业资源管理功能

改革开放以来,随着渔业经济的快速发展,我国的渔业发展面一临着渔业资源严重枯竭、渔业监管困难、渔民收入增长幅度放缓等诸多问题。为此学术界在渔业资源管理方法上提出了许多意见,同时也存在着一些分歧。文章通过理论推演,结合文献数据,探讨了渔村社区组织与我国渔业协会的关系,分析了包括渔业协会在内的渔村社区组织对渔业资源管理的作用,通过对代表性渔业资源管理理论的利弊分析,剖析了渔民协会等渔村社区组织的渔业资源管理职能。同时指出由于渔业协会在资源管理中具有重要作用,但因其自身也存在着一定局限性,因此,培育渔业协会、完善其资源管理职能,实行基于渔业协会等渔村社区组织的合作管理也就成为我国加强渔业资源管理的一种制度选择。     

国际金枪鱼渔业管理趋势及对我国发展金枪鱼渔业的影响

发展远洋渔业是我国渔业企业调整渔业生产结构的举措之一,其中发展大洋性金枪鱼渔业是许多渔业企业的选择方向。到2001年底,我国金枪鱼渔船数量增加到350艘左右,其中大洋性超低温金枪鱼绳钓渔船近100艘,初步估计产量3万t左右。我国还开始发展了大型金枪鱼围网渔船,国产超低温金枪鱼延绳钓渔船和近海玻璃钢小型金枪鱼延绳钓渔船已经投入生产。我国大西洋金枪鱼船队均为超低温延绳钓渔船;印度洋和南太平洋金枪鱼捕鱼船队仍然以小型冰鲜金枪鱼延绳钓渔船为主,但超低     

水库渔业经营管理体制探析

对水库渔业经营管理的租赁经营、承包经营、股份经营、公司制经营等几种主要方式进行了探讨和分析，提出了不同经营方式的适应范围和条件。     

The Application of a Simple Economic Technique to Fisheries Management Problems

In the field of fisheries management workers are often confronted with a choice of management methods. For example, should annual requirements for fish for stocking purposes be purchased from external suppliers or should the manager invest in a fish farm and raise his own fish; should chemicals be used to control weed growth or should an investment be made in a mechanized weed cutter? The final decision, after impractical alternatives have been eliminated, is often an economic one and a basic economic technique is described here which allows the manager to make an economically sound decision. The technique involves the application of a discounting method (the particular one described is the Net Present Value method) which has the advantage of taking into consideration the timings of the cash outflows of the alternative projects thus bringing the two projects to a common baseline (their NPV's) for comparison. Two examples are given which show the application of the method to fisheries management. It is emphasized that the selection of an appropriate interest rate is important since the choice indicated by the results is sensitive to changes in interest rate.     

临沂市水库渔业经营管理现状及规范措施

水库渔业经营管理体制是影响水库渔业发展的根本。总结了临沂市水库渔业现行的管理、经营方式以及存在的主要问题，提出了规范水库渔业经营管理的6项措施。     

水产加工业可追溯性管理与海洋渔业可持续性发展

水产品是一种健康的且不断更新的食品来源。水产品经济也是全球渔业贸易的重要组成,同时也为全球生活和就业做出了重要贡献。据《2008年世界渔业和水产养殖状况》统计[1],2006年,全球捕捞渔业产量约为9.2×107 t,其中海洋捕捞产量为8.2×107 t。亚洲国家占全球捕捞产量的52%;我国依     

新西兰渔业管理考察报告

报道了新西兰的渔业概况及配额、渔区、网目、船员、对外的渔业管理。     

Excel电子表在渔业生产管理中的应用

用Excel电子表进行渔业生产统计,苗种投放及生产投入等可一目了然,产量、产值、利润统计准确、快捷．参试单位间数据交流方便。     

Problems of Fisheries Management in Northern Quebec*

The James Bay and Northern Quebec Agreement, signed in 1975, was designed to protect native culture and allow the Cree and Inuit to pursue their subsistence fishing and hunting almost free from government regulations. The land has been zoned: native owned, exclusive areas for native hunting and fishing, with the remaining land also available for traditional activities. Conservation is a theme of the agreement. It is the responsibility of committees with Cree, Inuit and government representatives to monitor environmental and social conditions. The Cree believe their ‘Tally-man’ system is sufficiently sensitive to ensure conservation of fish and game populations. Most fish populations are presently unex- ploited with a predominance of large old fish. These are ideal for subsistence fishing and the native peoples would like to maintain this situation. A native harvest study has revealed some unexpectedly high yields. Conflicts are possible between sports fishing and native fisheries. The agreement may serve as a model for settlements with other native groups, but it is still too early to know whether the integrity of the northern environment can be protected by such legislation.     

峡山水库水质管理与渔业资源利用

峡山水库集防洪、工业及城乡供水、灌溉、发电和水产养殖多种功能,为潍坊市生活饮用水一级保护区。分析了水库的渔业现状,讨论了水库水体富营养化的成因、危害及防治,提出了开发利用水库渔业资源的具体措施。     

地理信息系统在海洋与渔业管理中的应用

地理信息系统的发展源于计算机硬件、软件技术的发展,是以地学、资源环境、区域科学、遥感等空间分析技术领域的理论与方法为基础,并与计算机技术相结合的产物.随着地理信息系统的成熟,其应用范围已深入到国民经济和资源管理的各个领域,从过去的简单资源数据库发展到综合分析、综合评价及决策支持.随着计算机的普及和网络的完善,地理信息系统必将广泛地应用到各项海洋开发和管理工作中,海洋与渔业管理应尽早利用地理信息系统的成果,使工作效率和管理水平提高到新的层次,适应信息时代的要求,为海洋经济的发展服务.