Centre for Ocean Life, National Institute of Aquatic Resources, (DTU Aqua), Technical University of Denmark, Kgs. Lyngby, Denmark.
Section for Maritime Service, National Institute of Aquatic Resources, (DTU Aqua), Technical University of Denmark, Kgs. Lyngby, Denmark.
PLoS One. 2022 Aug 4;17(8):e0271823. doi: 10.1371/journal.pone.0271823. eCollection 2022.
The recent return of Atlantic bluefin tuna to northern Europe following the recovery of the east Atlantic stock has sparked substantial public and scientific interest. This is particularly true for recreational anglers in Denmark, who often consider Atlantic bluefin tuna to be the catch of a lifetime. This attitude has previously sustained a substantial recreational fishery for bluefin tuna with annual tournaments in Denmark, which peaked in the 1950s before the subsequent collapse of the stock during the 1960s. Several scientific tagging programs have recruited recreational anglers in recent years to help catch and release tagged bluefin tuna. The anglers' investment of time and money in the scientific tagging projects indicate that the recreational fishery could recover in the future. However, the economic aspects of a potential future recreational bluefin tuna fishery remain unknown. We surveyed anglers participating in a scientific catch and release bluefin tuna fishery in Denmark across three years (2018-2020) and calculated the total annual expenditures associated with the activities. Additionally, we estimated the magnitude of the negative impact (i.e., incidental mortalities) on the bluefin tuna stock. Our results show that total annual expenditures by the recreational anglers approached 1,439,540€, totaling 4,318,620€ between 2018 and 2020. We found that recreational bluefin tuna anglers had mean annual expenditures directly related to the bluefin tuna fishing between 7,047€ and 2,176€ with an associated mortality impact on the stock of less than 1 tonne annually. By comparing the mortality impact to the expenditures, we estimate that each dead Atlantic bluefin tuna during the three study years generated 398,163€ in mean annual expenditures, equivalent to approximately 1636€ kg-1. Our study demonstrates significant economic expenditures among recreational anglers who target Atlantic bluefin tuna. This provides a clear example of how a recovery of marine natural capital and related ecosystem services can support development in the blue economy.
近年来，北大西洋金枪鱼在东大西洋种群恢复后返回北欧，引起了公众和科学界的极大兴趣。对于丹麦的休闲垂钓者来说尤其如此，他们通常认为大西洋金枪鱼是一生的渔获。这种态度以前支撑着丹麦的大型金枪鱼休闲渔业，每年都有锦标赛，在 20 世纪 50 年代达到顶峰，随后在 20 世纪 60 年代该种群崩溃。近年来，几项科学标记计划招募了休闲垂钓者来帮助捕捉和释放标记的金枪鱼。垂钓者在科学标记项目上投入的时间和金钱表明，休闲渔业未来可能会恢复。然而，未来潜在的休闲金枪鱼渔业的经济方面仍然未知。我们在三年（2018-2020 年）内调查了参与丹麦科学放流金枪鱼渔业的垂钓者，并计算了与活动相关的总年度支出。此外，我们估计了对金枪鱼种群的负面影响（即偶然死亡）的规模。我们的研究结果表明，休闲垂钓者的年度总支出接近 143.954 万欧元，2018 年至 2020 年期间总计 431.862 万欧元。我们发现，休闲金枪鱼垂钓者每年与金枪鱼捕捞直接相关的平均支出在 7047 欧元至 2176 欧元之间，对该种群的死亡率影响每年不到 1 吨。通过比较死亡率影响和支出，我们估计在三年的研究期间，每头死亡的大西洋金枪鱼产生的平均年度支出为 398163 欧元，相当于每吨约 1636 欧元。我们的研究表明，目标为大西洋金枪鱼的休闲垂钓者的经济支出巨大。这清楚地表明，海洋自然资本和相关生态系统服务的恢复如何能够支持蓝色经济的发展。
