Saulamo Kari, Thoresson Gunnar
Department of Biological and Environmental Sciences, University of Helsinki, Finland.
Ambio. 2005 Mar;34(2):120-4.
Pikeperch Sander lucioperca (L.) were tagged in an area where ten small independent management units regulate fisheries, in order to analyze the relevance of migrations for the management. A total of 465 fishes were tagged in connection with the spawning migration. The number of recaptures was 96. The distribution of recaptures between areas and that of total catches, estimated from questionnaire to housholds and, individuals in the survey area, were correlated. The comparison of tagging and recapture dates showed that the same pikeperch migrated to the spawning areas at the same time in two subsequent years, indicating the existence of individual spawning behavior. A modified yield/recruit-model demonstrated that in situations where the dispersal area of a pikeperch stock overlaps with several management areas, the risk of overfishing is very high. Management of this kind of fisheries needs cooperation between units as well as sound data on the movements of pikeperch to define the effects of fishing regulations.
梭鲈（Sander lucioperca (L.)）在一个由十个小型独立管理单位对渔业进行管理的区域被标记，以便分析洄游对管理的相关性。在与产卵洄游相关的活动中，总共标记了465条鱼。重新捕获的数量为96条。根据对调查区域内家庭和个人的问卷调查估计，各区域间重新捕获的分布情况与总渔获量的分布情况相关。标记日期和重新捕获日期的比较表明，在随后的两年中，同一批梭鲈在同一时间洄游到产卵区域，这表明存在个体产卵行为。一个经过改进的产量/补充量模型表明，在梭鲈种群的扩散区域与多个管理区域重叠的情况下，过度捕捞的风险非常高。这类渔业的管理需要各单位之间的合作以及有关梭鲈洄游的可靠数据，以确定捕捞规定的影响。
