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Aerial survey as a tool for understanding bigeye scad (Selar crumenophthalmus) dynamics around the island of O'ahu, Hawai’i
Fisheries Research ( IF 2.4 ) Pub Date : 2021-01-05 , DOI: 10.1016/j.fishres.2020.105866
John Wiley , Marlowe Sabater , Brian Langseth

The bigeye scad (Selar crumenophthalmus) supports one of the most productive near-shore fisheries in Hawai'i. Fishing boats frequently work in tandem with spotter planes to efficiently target bigeye scad schools. These spotter planes provide the means for a fishery-independent estimate of abundance based on direct observation, which may prove more sensitive to population trends than traditional estimates based on reported commercial catch and effort. An experienced spotter pilot was utilized to survey the biomass of bigeye scad schools surrounding the island of O'ahu for the 2015–2016 fishing season. The survey data were then used to create fishery-independent indices of apparent abundance at varying spatial and temporal scales to compare with fishery-dependent indices generated from commercial catch and effort data from net gears. The survey data also allowed for a better understanding of bigeye scad spatial and temporal patterns around O'ahu. Trends between fishery-independent and fishery-dependent indices of abundance were similar. The western region of O'ahu has the highest index value, exceeding each of the other three regions by two to five times. A clear temporal trend was also observed; indices increased from the lowest values during the beginning of the fishing season (November–January) to the highest values during the peak season (May–July). Our findings suggest that commercial catch and effort data are adequate to track trends in abundance of bigeye scad and inform management decisions.



中文翻译:

空中勘测是了解夏威夷瓦胡岛周围大眼海豹(Selar crumenophthalmus)动态的工具

大眼鳞(Selar crumenophthalmus)支持夏威夷最有生产力的近岸渔业之一。渔船经常与侦察机协同工作,以有效地瞄准大眼大专院校。这些探查飞机为基于直接观察的渔业独立性丰度估计提供了手段,与基于报告的商业捕捞量和工作量的传统估计相比,这可能证明对人口趋势更加敏感。在2015-2016捕鱼季节,一位经验丰富的检测员飞行员被用来调查瓦胡岛周围大眼鲷学校的生物量。然后将调查数据用于在不同的空间和时间尺度上创建与渔业无关的表观丰度指数,以与从净渔具的商业捕捞量和努力量数据生成的与渔业有关的指标进行比较。调查数据还使人们可以更好地了解欧胡岛周围的大眼石块的时空格局。不依赖渔业的丰度指数与不依赖渔业的丰度指数之间的趋势相似。瓦胡岛西部地区的指标值最高,比其他三个地区高出两倍到五倍。还观察到明显的时间趋势;指数从捕鱼季节开始(11月至1月)的最低值增加到旺季(5月至7月)的最高值。我们的发现表明,商业捕捞量和努力量数据足以跟踪大眼大量的趋势并为管理决策提供依据。瓦胡岛西部地区的指标值最高,比其他三个地区高出两倍到五倍。还观察到明显的时间趋势;指数从捕鱼季节开始(11月至1月)的最低值增加到旺季(5月至7月)的最高值。我们的发现表明,商业捕捞量和努力量数据足以跟踪大眼大量的趋势并为管理决策提供依据。瓦胡岛西部地区的指标值最高,比其他三个地区高出两倍到五倍。还观察到明显的时间趋势;指数从捕鱼季节开始(11月至1月)的最低值增加到旺季(5月至7月)的最高值。我们的发现表明,商业捕捞量和努力量数据足以跟踪大眼大量的趋势并为管理决策提供依据。

更新日期:2021-01-05
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