Effects of a large northern European no-take zone on flatfish populations.
Effects of a large northern European no-take zone on flatfish populations.
复制标题
北欧大片禁渔区对比目鱼种群的影响。
DOI：
10.1111/jfb.12097
复制
发表时间：
2013
影响因子：
2
通讯作者：
P. Jonsson
中科院分区：
文献类型：
--
作者：
Ann;U. Bergström;D. Ustups;K. Lundström;P. Jonsson
2006年3月，在波罗的海中部的哥得兰岛以北建立了一个360平方公里的禁捕区，目的是科学地评估禁捕对比目鱼种群的影响。设立了一个监测方案，以研究非关税区和哥特兰岛以东一个渔业压力很大的参照区的种群。该方案包括使用多目调查网捕鱼、建立可能的幼体出口模型和估计大型海洋捕食者的鱼类消费量。总体而言，结果表明，NTZ对大菱鲆有明显的积极影响，与捕捞区相比，封闭区的密度更高，封闭后的密度也更高。NTZ也有年龄较大的个体和更均匀的性别比例。这一点，结合从NTZ到哥特兰岛的幼虫出口的高潜力，表明海洋保护区可能对维持一个可行的S。在哥特兰的马克西姆斯股票。此外，比目鱼Platichthys flesus，密度较高，在NTZ相比，参考区，有一个净幼虫出口到捕捞区。对于这两个物种，密度依赖性的增长是显而易见的，在封闭区的年龄较低的长度。还讨论了灰海豹Halichoerus grypus和大鸬鹚Phalacrocorax carbo sinesis对比目鱼的潜在捕食，这可能会阻碍对海洋保护区的评估。总之，结果表明，有明显的好处，禁渔的两种比目鱼在NTZ内，而对渔业的净影响是难以量化的。
In March 2006, a 360 km² no-take zone (NTZ) was established north of Gotland in the central Baltic Sea, with the purpose to scientifically evaluate the effects of a fishing ban on flatfish populations. A monitoring programme was set up to study the populations in the NTZ and in a reference area east of Gotland where the fishing pressure was high. The programme included fishing with multimesh survey nets, modelling of potential larval export and estimation of fish consumption by large marine predators. Overall, the results showed a clear positive effect of the NTZ on turbot Scophthalmus maximus, with higher densities in the closed area compared with the fished area and also higher densities after closure compared with before. The NTZ also had older individuals and a more even sex ratio. This, in combination with a high potential for larval export from the NTZ to Gotland, shows that the marine reserve may be important for maintaining a viable S. maximus stock at Gotland. Also, for flounder Platichthys flesus, the densities were higher in the NTZ compared to the reference area and there was a net larval export to the fished area. For both species, density-dependent growth was evident, with a lower length at age in the closed area. Potential predation by grey seal Halichoerus grypus and great cormorant Phalacrocorax carbo sinesis on flatfishes, that could hamper the evaluation of the marine reserve, was also addressed. Taken together, the results show that there are clear benefits of the fishing ban for both flatfish species within the NTZ, while the net effects on fisheries are difficult to quantify.