捕捞努力量

底拖网作业捕捞努力量标准化方法研究

An Approach to the Standardization of Fishing Effort of Bottom Trawl

渔业补贴、捕捞努力量与渔业总成本

Fisheries Subsidies , Fishing Effort and the Total Cost of Fisheries

通过与SELECT模型比较，认为模型使用选择性方程并区分渔获能力和捕捞努力量使得模型更具普遍性。

Compared with SELECT model , this model was found to be more general than the SELECT model because of the usage of selection equation and the separation of fishing power and catch effort .

保持这样的捕捞努力量，则可实现渔捞业的可持续发展。

The sustainable development of fishery resources will be realized if the given optimum economical fishing effort is kept .

同时，分析了渔业资源量、资金、回捕重量在五种不同捕捞努力量下的波动状况。

In addition , this paper also analyses the fluctuation of the fishery biomass , recapture weight and capital with five different fishing efforts .

它是把种群或资源群体作为一个研究分析的单位，研究一个资源群体的持续产量、最佳捕捞努力量和资源群体大小之间的平衡关系。

It treat fish population or resource stock as a study unit , analyze the relationship between sustainable yield , optimum fishing effort and population size .

产生这种低效率的原因在于每个主体只考虑自己投入的捕捞努力量对自己利润的影响，而不考虑对对方或社会产生的负面影响。

Such inefficiency attributes to the fact that every player only considers the positive influence to his yield and ignores the negative influence to his counterpart and the society .

努力以最低的成本获取最大的销量。保持这样的捕捞努力量，则可实现渔捞业的可持续发展。

Seeks the maximum volume of sales with the minimum cost . The sustainable development of fishery resources will be realized if the given optimum economical fishing effort is kept .

监测调查表明南沙珊瑚礁水域的软骨鱼类在全年均可捕获，产量的变动主要与捕捞努力量相关。

The monitoring survey indicated that Chondrichthyes in the Nansha Islands waters could be captured all the year round , and the yield was mainly related with the fishing effort .

改变环境温度和捕捞努力量实验，得到了在这些改变下鳀鱼种群分布、生物量、年龄结构和各龄全长动态过程。

Experiments were made by changing environment temperature and fishing effort . The population distribution , biomass , age structure and body length of anchovy under these conditions are studied .

其结果是99.6千公吨的最大持续产量和114760作业日的最佳捕捞努力量。

A Thousand Marbles The production model produced a maximum sustainable yield ( MSY ) of 99.6 Kilo-MT and an optimum fishing effort ( f_opt ) of 114.76 Kilo-fishing days .

2.2006～2009年春季调查期间，同一年度不同航次捕捞努力量的分布随时间延续亦有一定变化，但不同年度变化趋势并不一致。

Distribution of Fishing effort amount had certain changes with time extending in different voyage in the same year , but the changes tend to disaccord in spring of 2006 ~ 2009.3 .

资源评估不仅仅是预测静止的最佳捕捞努力量和持续产量，而是评估鱼类和渔民对管理决策和其它变化的动态反应。

Stock assessment is not only to forecast the static optimum fishing effort and sustainable yield , but also to assess the reactions of fish and fishermen to management choices and other changes .

渔捞业中的最佳经济产量是指能使持续的纯利润最大的产量，此时投入的捕捞努力量为最佳经济捕捞努力量。

In addition , the maximum sustainable yield ( MSY ) and the optimum fishing effort ( FMSY ) were estimated on the basis of fishery statistics data by Schaefer model and Fox model .

利用聚类和相关分析方法，研究了单位捕捞努力量渔获量与表层盐度及不同水层水温的关系。

By using methods of cluster and correlation analysis , the correlation of the catch per unit effort ( CPUE ) to the sea surface salinity and the seawater temperatures of different depths were studied .

人工放流比例的增加、封湖禁渔时间的延长，繁殖保护区的扩大、捕捞努力量的下降、沉水植物的恢复是控制渔业小型化的主要措施。

Rate of stocking fisheries increasing , time of embargo and sloping fishing extend , breeding protect area enlarge , fishing rate decreasing , submerged plant comeback are the main policy control small-scale fisheries development .

捕捞总努力量渔获量

Catch of total fishing effort

开展渔业资源学的研究需要对渔业生产和资源分布及变动特征有深入细致的了解，这包括渔船作业的时空特征、捕捞作业情况以及渔获量和捕捞努力量等统计数据。

Researches on fisheries resources need a detailed understanding of fisheries about features and changes in the production and distribution , including statistical data such as spatial and temporal characteristics , fishing operations as well as catch and fishing effort .

随着捕捞强度的不断增加，鱼产量不断上升，单位捕捞努力量（CPUE）却不断下降。

The catch per unit effort ( CPUE ) decreased in recent years due to over-exploitation with the increasing fishing boats .

与只有一个捕捞主体相比，当存在两个捕捞主体时，每个捕捞主体投入的捕捞努力量将增加或保持不变，但每个主体单位捕捞努力量所能取得的纯利润将减少。

Compared with one player case , when there are two players , the fishing effort of each player will increase or be invariant , but the maximum sustainable profit that unit fishing effort can get will decrease .

在存在两个捕捞主体的情况下，分别就Cournot模型和Stackelberg模型分析了两个主体为了自身获得最大持续利润而投入的捕捞努力量。

Under the assumption that there are two fishing players , this paper studies the problem that how each of them determines his fishing effort in Cournot model and Stackelberg model respectively , with an objective of maximizing his sustainable profit .