Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Amphidromous postlarvae fisheries (APFs) constitute a globally widespread and distinctive class of fishery that is largely unknown to fisheries science. APFs harvest ocean-to-river migrating fishes at smaller sizes and younger ages than any other class of fishery. No quantitative estimates of run size and exploitation exist, which are needed to evaluate APF sustainability. Migrating amphidromous fishes are vectors of marine nutrients to estuaries and rivers, and run size quantification is needed to reveal the magnitude of this ecosystem function. We present a novel adaptation of trapezoidal area under the curve methods, which we apply in a Caribbean case study to yield the first simultaneous estimates of an APF run size and harvest. Run size estimates ranged 7.3–9.4 million postlarvae (926–1184 kg), and exploitation estimates (5.8%–7.0%) indicated low harvest in the Río Grande de Arecibo, Puerto Rico. Our representative run size estimates reveal that amphidromous postlarvae transport hundreds of kilograms of biomass per month to an estuary and river, the first empirical evidence that amphidromous migrations are large-magnitude material subsidies of lotic ecosystems.

中文翻译：

---

大鱼群：对两栖虾苗渔业的鱼群规模和开发利用的初步估计

加拿大渔业和水产科学杂志，提前印刷。
两栖后期幼体渔业 (APF) 构成了全球广泛分布的独特渔业类别，渔业科学在很大程度上不了解这一类别。APFs 捕捞的海洋到河流洄游鱼类比任何其他类别的渔业都更小、年龄更小。不存在评估 APF 可持续性所需的运行规模和开发的定量估计。迁移的两栖鱼类是海洋营养物质到河口和河流的载体，需要进行规模量化来揭示这种生态系统功能的大小。我们提出了曲线下梯形面积的新适应，我们将其应用于加勒比案例研究，以产生 APF 运行大小和收获的第一个同时估计。运行规模估计范围为 7.3-940 万条虾苗（926-1184 公斤），开发估计数（5.8%-7. 0%) 表示波多黎各的 Río Grande de Arecibo 收成低。我们的代表性运行规模估计表明，两栖后期幼虫每月将数百公斤的生物量运送到河口和河流，这是证明两栖迁徙是水生态系统的大量物质补贴的第一个经验证据。