Joshua D. Hardesty
Nicholas T. Jordan
Samuel G. Roy
Timothy F. Sheehan
Shawn D. Snyder
Joseph D. Zydlewski
Daniel S. Stich
2025
<p>Diadromous fishes world-wide experienced precipitous declines during the 19th and 20th centuries due to a combination of overfishing, pollution, and freshwater habitat loss through construction of dams (Limburg & Waldman, 2009). Following wide-spread fishing closures and large-scale remediation of many historical pollution sources, dams in coastal rivers remain as the largest tractable impediment to population recovery for many of these species (Waldman & Quinn, 2022). In some cases, dams reduce access to as much as 95% of freshwater and rearing habitat (Hall et al., 2011). These effects are especially pronounced for species that rely on long-distance migrations to spawning and rearing habitat upstream of barriers such as various alosines (herrings; e.g., American shad <i>Alosa sapidissima</i>, alewife <i>A. pseudoharengus</i>, and blueback herring <i>A. aestivalis</i> (Noonan et al., 2012)) and salmonines (trout and salmon; e.g., <i>Salmo</i> spp. (Parrish et al., 1998) and <i>Oncorhynchus</i> spp. (Quiñones et al., 2015). </p><p>Traditional stock assessment tools such as per-recruit analyses often fail to capture management complexities related to diadromous life histories such as fish passage at dams, and integrated assessment models can be difficult to parameterize for data-poor species such as herrings (Atlantic States Marine Fisheries Commission, 2024). This has resulted in the development of species- and system-specific approaches to fisheries stock assessment and management strategy evaluation (Barber et al., 2018; Nieland et al., 2015; Roy et al., 2018; Stich et al., 2019). We created the anadrofish package (Stich, Hardesty, et al., 2025) for R (R Core Team, 2025) to provide a generalized approach that also allows broader application to novel species, systems,<br>and scenarios.</p>
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10.21105/joss.08564
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Open Journals
anadrofish: Anadromous fish population responses to dams
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