Correlations Between Alewife Activity and Environmental Variables at a Fishway

Saila, Saul B.; Polgar, Tibor T.; Sheehy, Daniel J.; Flowers, Jonathan M.

doi:10.1577/1548-8659(1972)101<583:cbaaae>2.0.co;2

Cited by 28 publications

(22 citation statements)

References 4 publications

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“…Electronic resistivity counters (ERCs) operate by monitoring changes in water conductivity caused by fish passing through a counting array (Forbes et al 1999a;Eatherley et al 2005). The information they provide is used to assess long-term trends in stock abundance (Moores and Ash 1984), investigate environmental influences on migration (Hellawell et al 1974;Jensen et al 1986;Alabaster 1990), and evaluate fishway utilization (Saila et al 1972) and performance (Pon et al 2006). However, ERCs have several disadvantages, including missed, false, and multiple counts (Dunkley and Shearer 1982;Smith et al 1996;Forbes et al 1999aForbes et al , 1999b.…”

mentioning

confidence: 99%

Utility of Single‐Channel Electronic Resistivity Counters for Monitoring River Herring Populations

Sheppard¹,

Bednarski²

2015

N American J Fish Manag

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Automated electronic counting systems are used to estimate river herring populations throughout New England. Measuring the accuracy of these counting systems is essential to understanding the limitations of counter‐derived estimates, which comprise a vital component of river herring stock assessments. Our objective was to conduct a direct visual–electronic comparison of passage to evaluate the accuracy and biases of using single‐channel electronic resistivity counting systems to monitor river herring. From 1999 to 2012, we conducted 1,189 direct comparisons. Of these, 555 occurred when river herring were actively migrating through the system. The counting system consistently underestimated passage, with 34–87% of seasonal observations recording fewer fish than were known to pass. Mixed‐effects logistic regression indicated that the probability of an inexact count increased with increasing passage rate, which we attribute to simultaneous passage. We explored two techniques to correct for the biases observed during our sampling period and produce corrected estimates of run size. Although our results have limitations, the consistency of observed bias provides evidence that single‐channel counters yield the resolution needed to infer population trend. Future monitoring should endeavor to correct the biases in single‐channel counters and to explore alternative technologies that provide greater accuracy. Received April 3, 2015; accepted August 10, 2015

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confidence: 99%

Utility of Single‐Channel Electronic Resistivity Counters for Monitoring River Herring Populations

Sheppard¹,

Bednarski²

2015

N American J Fish Manag

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“…Anadromous fish provide recreational and commercial fishing opportunities; serve as an ecological link between freshwater, estuarine, and coastal food webs (Salia et al 1972;Willson and Halupka 1995); and are components of many coastal watershed restoration and management programs. Anadromous river herring, the collective term for two closely related and jointly managed species (alewife Alosa pseudoharengus and blueback herring A. aestivalis; Collette and Klein-McPhee 2002), have historically been important in rivers along the mid-and North Atlantic coast of North America.…”

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confidence: 99%

Evaluation of a Gastric Radio Tag Insertion Technique for Anadromous River Herring

Smith

Mather

Frank

et al. 2009

N American J Fish Manag

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Anadromous river herring (alewives Alosa pseudoharengus and blueback herring A. aestivalis), which constitute a historically and ecologically important component of coastal rivers, have declined precipitously throughout the Atlantic seaboard. Suggested causes of river herring decline include commercial fishing and predation by striped bass Morone saxatilis. Although the causes of this recent trend are poorly understood, river herring are especially vulnerable to adverse impacts during their spring spawning migration. Radiotelemetry is an especially useful method for addressing potential problems encountered during the movement of these fish from the ocean to freshwater. In spite of frequent calls for evaluation of telemetry methods, controlled tests of posttagging effects are rare for alosids and virtually nonexistent for anadromous river herring. We developed a protocol for gastric tagging of anadromous river herring, and we used hatchery and field studies to evaluate behavior, tag placement, stress response, and posttagging mortality. We also compared tagger effects and quantified posttagging upstream movements of fish in the field. In controlled hatchery trials, no fish died at 10 min, 1 h, or 14 d posttagging. No tags were rejected, and only 1 of 35 tags ruptured the gut. In field cages, mortality, plasma cortisol, glucose, and chloride measured at 24 h were similar between tagged and untagged fish. In the field, 12 of 14 fish moved upriver after tagging and spent 114 h on average at upriver sites. Using a variety of approaches, we found no evidence that our tagging protocol adversely affected river herring in comparison with untagged fish that were subjected only to handling and holding. Our protocol, evaluated by comparing responses of tagged and untagged fish under controlled conditions, may be useful in future studies that seek to understand causes of decline for anadromous river herring.

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“…La tendance est un processus de basse fréquence (FORTIER et al, 1978 ;LEGENDRE et LEGENDRE, 1979) que nous considérons comme un phénomène cyclique de période annuelle dépendant de l'écologie des populations mais susceptible d'être influencé par les conditions environnementales précédant ou accompagnant le phénomène. Une approche du même type a été utilisée par SAILA et al, (1972) pour mettre en évidence les rythmes d'activités de A. pseudoharengus en rivière.…”

Section: Méthode Retenueunclassified

Migration Anadrome Estuarienne Des Géniteurs De Grande Alose Alosa Alosa, Allure Du Phénomène Et Influence Du Rythme Des Marées.

Rochard¹

2001

Bull. Fr. Pêche Piscic.

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Correlations Between Alewife Activity and Environmental Variables at a Fishway

Cited by 28 publications

References 4 publications

Utility of Single‐Channel Electronic Resistivity Counters for Monitoring River Herring Populations

Utility of Single‐Channel Electronic Resistivity Counters for Monitoring River Herring Populations

Evaluation of a Gastric Radio Tag Insertion Technique for Anadromous River Herring

Migration Anadrome Estuarienne Des Géniteurs De Grande Alose Alosa Alosa, Allure Du Phénomène Et Influence Du Rythme Des Marées.

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