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首页> 外文会议>International Congress of the Maritme Association of the Mediterranean >Does spatial patterns in fishing explain dynamics of commercial pelagic populations in Baltic Sea?
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Does spatial patterns in fishing explain dynamics of commercial pelagic populations in Baltic Sea?

机译：在钓鱼中是否在波罗的海钓鱼中的空间模式解释了商业骨质人口的动态？

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Commercial fishing pressure has selective effect on the exploited fish stocks, usually targeting individuals with larger individual growth rate/size and older age. Therefore, variability in the spatial and temporal fishing pressure is believed to result in fluctuations of fish species individual traits, like age/size structure of fish stocks. The intensity of fishing pressure can strongly affect the stock structure, and even destabilize the stock. We used two different sources (fishery independent survey results and commercial fishery) to evaluate the indicators of spatial variability in fishing pressure in parallel to fisheries-independent survey information to evaluate the possible effects of spatial concentration of fishing on sprat (Sprattus sprattus) and Baltic herring (Clupea harengus membras) populations in the Northeastern Baltic Sea. The study revealed no evidence in linking spatial concentration of fishing pressure and change in age structure or average body weight of fishes. Variable fishing pressure was linked to variabilities in stock size, which indicates that fluctuating harvest may cause undesired fluctuations in stock decline scenario. The results also indicate high mobility and plasticity of Baltic pelagic fish species in intensively exploited areas.
机译：商业钓鱼压力对爆炸的鱼类股具有选择性影响，通常针对具有较大个体增长率/尺寸和较老年的个体。因此，据信空间和时间钓鱼压力的可变性导致鱼类种类个体特征的波动，如鱼类库存的年龄/尺寸结构。钓鱼压力的强度会强烈影响股票结构，甚至稳定股票。我们使用两种不同来源（渔业独立的调查结果和商业渔）到空间变异在捕捞压力在平行于指标评价渔业无关调查信息来评估钓鱼的空间浓度对西鲱（黍鲱）和巴尔的可能影响鲱鱼（Clupea Herengus Membras）在东北波罗的海的群体。该研究显示没有证据表明，将空间浓度链接到钓鱼压力的空间浓度和变化的年龄结构或鱼类的平均体重。可变钓鱼压力与股票大小的可变性有关，这表明波动收获可能会导致库存衰落情景中的不期望的波动。结果还表明了波罗分型鱼类在集中利用区域的高迁移率和可塑性。

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