Studay on the Planning of Water Reservior and Canal System to Furnish the Condition of Habitat for the Fish in Cyprinidae

这项研究涵盖了1993年至1996年的3年期间。近年来，公共建设的目的已经从为生产活动投入社会资本向创造和改善人类生活环境的目的发展。该工程可能位于自然保护区和人类活动区域之间的缓冲地带，也就是生态网络。因此，收集水库和渠系中自然与人类活动关系的实际状况数据，对充分规划具有重要意义。鲤鱼、鲫鱼是下游河区和水库典型的大型鱼类。特别是，在捕捞赫拉布纳（Carassius auratus cuvieri）的人们中，曾经建立了一个俱乐部和一个聚会。社会行动，例如，清理渔场和放鱼等等，都是由这些俱乐部进行的。在本研究的第一部分中，通过向山形县党员发放调查问卷和实地调查渔业活动，调查了上述Hera-buna渔业的实际情况。在此基础上，分析了影响储层垂钓者评价的5个因素。并将水库划分为3种类型的钓鱼场所。在水库的建设或改善，以提供栖息地的条件后，将鱼类释放到新的设施成为下一个问题。因此，在本研究的第二部分，通过在多马川池塘设置4管浮标（长度4m），观察溶解氧（Do）的垂直剖面。估算了浮游植物对Do剖面的影响。但认为玉川塘的影响不显著。从总溶氧量的变化可以得出，恢复到自然状态所需的时间约为2个月。

This study covered a 3-yr period between 1993 and 1996. In recent years, the purpose of public construction has been developing from the social capital inbestment for prduction activities to one for human life environment creation and improbement. That works may be located in buffer area between nature conservation area and human activities area in, so to say, the Ecological Network. Therefore it becomes important for the sufficient planning to collect the data of actual condition of relation between nature and human activities in the water reservior and cannal system.Well, Cyprinus carpit (carp), Carassius carassius (crucian carp), the typical larget fish for fishing at the lower river area and water reservior. Specialy, among the people fishing Hera-buna (Carassius auratus cuvieri), a club and a party used to be established. And social action, for examlpe, cleanning the fishing area and release of fishes and so on, is taking place by those clubs. In the first part of this study, the actual convition of above Hera-buna fishing was investgated through the questionaire distributed to the member of partys in Yamagata prefecture and through field investgation on fishing activity. Using the results, 5 factors of angler's estimation for the reservior were analized. And the water reserviors were classified to 3 types as fishing place. After the construction or improvement of water reservior to furnish the condition of habitat, it becomes the next issue to release fishes into the new facilities. So, in the second part of this study, the vertical profile of desolved oxygen (Do) wes observed by setting a buoy with 4-pipes (length 4m) in the Tamagawa Pond. Then influence of phytoplankton to the Do profile was estimated. However it was considered that the influence was insignificant in Tamagawa Pond. And it was concluded from the changing of total desolved oxygen that the period needed to return to natural condition was about 2-months.