Fisheries of the York River System

Hewitt, Amanda H.; Ellis, Julia K.; Fabrizio, Mary C.

doi:10.2112/1551-5036-57.sp1.99

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…migrations (Aunins and Onley 2009;Hilton et al 2011). Blue Catfish and Flathead Catfish were collected in the James River from March to May, as these months corresponded with the spring spawning movements of Blueback Herring, Alewives, and American Shad within the Chesapeake Bay (Garman and Nielsen 1992;Hewitt et al 2009;Hilton et al 2011). The majority of sampling was conducted in 2015, although some fish were collected during spring 2014.…”

Section: Methodsmentioning

confidence: 99%

Predation and Prey Selectivity by Nonnative Catfish on Migrating Alosines in an Atlantic Slope Estuary

et al. 2017

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Native to the central USA, the Blue Catfish Ictalurus furcatus and the Flathead Catfish Pylodictis olivaris have been widely introduced into many Atlantic slope rivers and are now found in several drainages of the Chesapeake Bay. Fisheries managers are concerned that these large, long‐lived catfish species may be contributing to observed declines in anadromous species, such as the American Shad Alosa sapidissima, Blueback Herring A. aestivalis, and Alewife A. pseudoharengus, all of which once comprised major U.S. fisheries. We assessed spatiotemporal variability and selectivity in the diets of Blue Catfish and Flathead Catfish during the spawning migration of these alosines. Catfish stomachs were collected during March–May in nontidal freshwater, tidal freshwater, oligohaline, and mesohaline portions of the James River. Diet contents were extracted from 2,495 catfish, 69.86% of which had prey items present in their foreguts (N = 1,743). We used DNA barcoding to identify degraded fish prey; nearly 30 taxa that would have otherwise gone undetected were identified in this manner. Blue Catfish had broad, omnivorous diets, whereas Flathead Catfish fed solely on other fish. Alosines were found in 4.46% of Blue Catfish stomachs and 16.67% of Flathead Catfish stomachs. Flathead Catfish selectively preyed on American Shad and, to a lesser degree, river herring. Alosines were consumed more frequently in nontidal freshwater areas, particularly in the high‐gradient reach between Bosher Dam and the 14th Street Bridge, and predation on alosines peaked in April. Our results suggest that Flathead Catfish are likely to have a greater per capita impact on depleted alosines. Furthermore, dams and other obstacles to fish movement may increase alosines’ vulnerability to predation by large catfish.

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Section: Methodsmentioning

confidence: 99%

Predation and Prey Selectivity by Nonnative Catfish on Migrating Alosines in an Atlantic Slope Estuary

et al. 2017

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“…The Pamunkey River is designated as critical habitat for the endangered Chesapeake Bay distinct population segment of ATS (NOAA, 2017). Numerous juveniles were collected prior to 2005 (Hewitt et al., 2009) and an adult spawning run verified in 2013 (Hager et al., 2014). Kahn et al., (2019) estimated 222 (137−576) spawning adults during fall 2016, the most among their six‐year study period, and an average across all years (2013–2018) of 132 individuals.…”

Section: Methodsmentioning

confidence: 99%

Atlantic sturgeon ( Acipenser oxyrinchus oxyrinchus Mitchill, 1815) early life stage consumption evidenced by high‐throughput DNA sequencing

et al. 2021

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Predation on early life stages of Atlantic Sturgeon Acipenser oxyrinchus oxyrinchus (ATS) may be a constraint to species recovery. Due to the difficulty in assessing consumption of early life stages with traditional diet analysis methods, we pursued an alternative DNA‐based approach. We extracted total gut content from gastrointestinal tracts of 23 fish species (593 samples) within the tidal‐fresh Pamunkey River fish assemblage collected from known ATS spawning grounds during prime spawning periods (September‐October) in 2016. High‐throughput DNA sequencing was used to amplify two markers for each sample: mitochondrial cytochrome c oxidase I (COI) and nuclear 18S ribosomal RNA gene. DNA sequences were compared to custom, SILVA 132, and NCBI databases. Results showed presence of ATS DNA in 22 samples (4%) across multiple native and nonnative tidal‐fresh fishes. The highest percentage of consumption occurred in samples from Common Carp Cyprinus carpio (11.5) and Striped Bass Morone saxatilis (12.5). Six percent of Blue Catfish Ictalurus furcatus samples had target DNA. Considering there were no bony structures or tissue resembling ATS during morphological evaluation, DNA detections were likely from partially‐fully digested eggs or early developing days‐old larvae. High‐throughput sequencing is capable of detecting consumption of ATS.

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Temporal and Spatial Effects on the Diet of an Estuarine Piscivore, Longnose Gar (Lepisosteus osseus)

McGrath¹,

Hilton²,

Musick³

2013

Estuaries and Coasts

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Fisheries of the York River System

Cited by 7 publications

References 21 publications

Predation and Prey Selectivity by Nonnative Catfish on Migrating Alosines in an Atlantic Slope Estuary

Predation and Prey Selectivity by Nonnative Catfish on Migrating Alosines in an Atlantic Slope Estuary

Atlantic sturgeon ( Acipenser oxyrinchus oxyrinchus Mitchill, 1815) early life stage consumption evidenced by high‐throughput DNA sequencing

Temporal and Spatial Effects on the Diet of an Estuarine Piscivore, Longnose Gar (Lepisosteus osseus)

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