Western Australian Fisheries and Marine Research Laboratories, Department of Primary Industries and Regional Development of Western Australia, South Perth, Western Australia, Australia.
Escuela Superior de Ciencias Marinas, Universidad Nacional del Comahue, San Antonio Oeste, Argentina.
J Fish Biol. 2022 Nov;101(5):1217-1224. doi: 10.1111/jfb.15193. Epub 2022 Sep 10.
Quantifying discards is essential for assessing the impact of fisheries on non-target species and the ecosystems in which these fisheries operate. In Western Australia (WA), fishers are required only to report catches of retained species. For the currently operating shark fisheries of WA, the authors quantified catch time series of discarded teleosts using data from at-sea observers collected since 1993. Sixty-two teleost species were observed in the catch of which 20 were routinely discarded. The most commonly discarded teleosts were western buffalo bream/silver drummer, Kyphosus cornelii/K. sydneyanus, and dusky morwong, Dactylophora nigricans. Annual discards peaked in the 1990s; nonetheless, current discard levels, 36.9 ± 2.1 (S.E.) t year , are much lower than the overall annual retained catches (c. 1000 t year ). The catch time series reconstructed in this study are important inputs for assessing the ecosystem-based approach used for managing WA's shark fisheries.
量化丢弃量对于评估渔业对非目标物种和这些渔业所运作的生态系统的影响至关重要。在澳大利亚西部（WA），渔民只需报告所捕捞的保留物种的渔获量。对于目前在 WA 运营的鲨鱼渔业，作者使用自 1993 年以来从海上观察员收集的数据，对丢弃的硬骨鱼的渔获时间序列进行了量化。在捕捞的 62 种硬骨鱼中，有 20 种被常规丢弃。最常被丢弃的硬骨鱼是西部黄鲷/银鼓鱼、Kyphosus cornelii/K. sydneyanus 和黑鳍褐鲷 Dactylophora nigricans。丢弃量在 20 世纪 90 年代达到峰值；尽管如此，目前的丢弃水平（36.9±2.1 t 年）远低于总保留渔获量（约 1000 t 年）。本研究重建的渔获时间序列是评估用于管理 WA 鲨鱼渔业的基于生态系统方法的重要投入。
