Migratory Behavior of American Shad in the York River, Virginia, with Implications for Estimating In‐River Exploitation from Tag Recovery Data

Olney, John E.; Latour, Robert J.; Watkins, Brian; Clarke, Douglas G.

doi:10.1577/t05-101.1

Cited by 34 publications

(52 citation statements)

References 18 publications

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“…Whether this is due to the turtle already having obtained sufficient food stores or seasonal increases in migratory restlessness is unknown. Although tagging has been known to cause the delay or abortion of migration (Bernard et al 1999, Olney et al 2006, this is the first report of tagging potentially triggering migration.…”

Section: Discussionmentioning

confidence: 81%

Evaluating potential tagging effects on leatherback sea turtles

Sherrill-Mix

James²

2008

Endang. Species. Res.

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Although the use of satellite tracking to study the leatherback sea turtle Dermochelys coriacea continues to increase, there has been little inquiry into the effects of this research. We investigated effects of handling and tagging on leatherbacks using state-space estimated positions from 42 turtles satellite-tagged at sea. Although a control group was not available, we observed several possible effects of tagging and handling. Turtles were much more likely to begin migration, and travel speeds were significantly higher in the first week after capture. We inferred that 17 of the 42 turtles departed Canadian waters immediately after tagging. Turtles were more likely to begin their migration immediately if they were tagged later in the year, or if they were tagged following entanglement in fishing gear. Turtles that remained in the north commenced foraging after a median of 12.7 d. We also documented reports of previously harnessed leatherbacks re-sighted on nesting beaches. Although it remains uncertain whether the observed effects are due to capture and/or tagging and whether they are detrimental to individual turtles, this study emphasizes the necessity of considering tag effects on this species.

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Section: Discussionmentioning

confidence: 81%

Evaluating potential tagging effects on leatherback sea turtles

Sherrill-Mix

James²

2008

Endang. Species. Res.

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“…Fallback is defined as the downstream movement of an upstream migrating anadromous fish following tagging ) and is used as a behavioral bioassay of adverse tag effects on alosines (Beasley and Hightower 2000;Hightower and Sparks 2003;Bailey et al 2004;Olney et al 2006). Once identified, fallback duration was calculated for both Alewives and Blueback Herring as the number of days until continuous up-river movement was observed.…”

Section: Methodsmentioning

confidence: 99%

“…Alternatively, it is possible that stresses resulting from tagging altered normal spawning behavior, causing accelerated spawning (releasing of eggs) or spawning cessation followed by rapid emigration. Olney et al (2006) reported that American Shad Alosa sapidissima exhibited similar altered migratory behaviors following tagging events causing some individuals to cease or delay spawning runs. The only female Alewife that returned to the spawning grounds was classified as spent (finished spawning) prior to tag insertion.…”

Section: Posttagging Behaviormentioning

confidence: 99%

Handling and Tagging Effects, In‐River Residence Time, and Postspawn Migration of Anadromous River Herring in the Hudson River, New York

Eakin

2017

Mar Coast Fish

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In a 2013 pilot study, acoustic tags were inserted into two species of river herring, Alewife Alosa pseudoharengus and Blueback Herring Alosa aestivalis. The primary objectives were to identify handling and tagging effects and assess inriver residence time. The secondary objective was to identify postspawn coastal migration patterns. Fish were collected on spawning grounds in the upper portion of the Hudson River, New York. Vemco V7 acoustic transmitters were gastrically inserted into 25 river herring (13 Alewives and 12 Blueback Herring) that were in pre, active, or post spawning conditions. In-river acoustic data were collected from 23 of the 25 river herring. The majority of tagged fish exhibited some level of fallback (downstream migration) after the tagging event, all Blueback Herring and all male Alewives returning to spawning areas. The majority of female Alewives did not return to the spawning area after tagging, and this may be a result of when and where tagging events occurred. Both species of river herring exhibited similar in-river residence times of approximately 2-3 weeks and exited the system 3-6 d after spawning. Information on coastal movements of four Blueback Herring (two females and two males) was also obtained, spanning the south shore of Long Island, New York, to the mouth of Penobscot Bay, Maine. Coastal and in-river tag detections were reported by members of the Atlantic Cooperative Telemetry Network. In conclusion, this experiment can now be repeated with confidence on a larger scale with multiyear tags in order to identify unknown in-river spawning areas, provide information regarding spawning site fidelity, and bolster current knowledge of coastal migration patterns for both species.

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“…Subsequent to the collections of spawning adults in 2002, spawning migrants taken in the same location were used in a acoustic tagging study to determine their ultimate spawning location (Olney et al 2006). Although there was evidence of significant handling effects, most released fish ultimately migrated to either the Mattaponi or Pamunkey Rivers to spawn.…”

Section: Discussionmentioning

confidence: 99%

“…Although there was evidence of significant handling effects, most released fish ultimately migrated to either the Mattaponi or Pamunkey Rivers to spawn. Of these migrants, 57% spawned in the Mattaponi River and 43% spawned in the Pamunkey River (Olney et al 2006 …”

Section: Discussionmentioning

confidence: 99%

Migratory patterns of American shad (Alosa sapidissima) revealed by natural geochemical tags in otoliths

Walther¹

2007

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Geochemical signatures in the otoliths of diadromous fishes may allow for retrospective analyses of natal origins. In an assessment of river-specific signatures in American shad (Alosa sapidissima), an anadromous clupeid native to the Atlantic coast of North America, stable isotope and elemental ratios in otoliths of juvenile American shad produced accurate natal tags from 12 rivers. Significant inter-annual variability in geochemical signatures from several rivers was detected, due largely to differences in δ 18 O values among years. The database was further expanded to include 20 rivers from Florida to Quebec, encompassing all major spawning populations. This task was accomplished by collecting juvenile otoliths along with water samples from rivers where juveniles were not sampled. Regressions between otolith and water chemistry for those rivers where both were collected showed significant relationships for Sr:Ca, Ba:Ca, δ 18 O, and 87 Sr: 86 Sr ratios but not for Mg:Ca or Mn:Ca. Despite reducing the combined signature to only four chemical ratios, cross-validated classification accuracies of knownorigin juveniles averaged 93%. Ground-truthed signatures were used to classify migrants of unknown origins. Adults returning to spawn in the York River were classified according to their otolith composition. Only 6% of spawners originated from rivers other than the York, supporting the hypothesis that most American shad spawn in their natal river. Of remaining spawners, 79% originated from the Mattaponi River and 21% from the Pamunkey River. The results suggested that while most American shad home to their natal river there is less fidelity to individual tributaries, allowing subsidies to subpopulations with persistent recruitment failure. Otolith signatures were also used in mixed-stock analyses of immature migrants along the coast of Maine in the spring and Minas Basin in the summer. Mixed-stock compositions showed remarkably low diversity and were dominated by fish from the Shubenacadie and Hudson rivers, with an increasing proportion of Potomac River fish over time. In contrast to results from adult tagging studies, southern stocks were virtually absent. These data suggest ontogenetic shifts in migratory behavior. The thesis concludes with a report that water contributed 83% of Sr and 98% of Ba in the otoliths of a marine fish.

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Migratory Behavior of American Shad in the York River, Virginia, with Implications for Estimating In‐River Exploitation from Tag Recovery Data

Cited by 34 publications

References 18 publications

Evaluating potential tagging effects on leatherback sea turtles

Evaluating potential tagging effects on leatherback sea turtles

Handling and Tagging Effects, In‐River Residence Time, and Postspawn Migration of Anadromous River Herring in the Hudson River, New York

Migratory patterns of American shad (Alosa sapidissima) revealed by natural geochemical tags in otoliths

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