(1995). Angler Survey Methods and Their Applications in Fisheries Management. North American Journal of Fisheries Management: Vol. 15, No. 1, pp. 238-240.

Angler Survey Methods and Their Applications in Fisheries Management

Recent range-wide declines have highlighted the need for information on the demographic composition of populations of anadromous river herring (Alewives Alosa pseudoharengus and Blueback Herring A. aestivalis). Here we report demographic data for the Blueback Herring run in the Connecticut River, the largest river in New England and a system from which contemporary river herring demographic data were not previously available. We collected Blueback Herring in a stretch of the Connecticut River via boat electrofishing during the spring migration seasons of 2005-07, and assessed relative abundance, size and age structure, spawning history, and sex ratio. Significant inter-annual variation was evident during study years: Blueback Herring were less abundant in 2005 than in 2006-07, but were generally older, larger, larger-at-age and more likely to be repeat spawners. However, despite inter-annual variation, herring collected during our study were on average much smaller, younger, and less likely to be repeat spawners than those collected during a similar study in the 1960s, suggesting that in recent decades this population has experienced truncations of size and age structure and loss of repeat spawners similar to those reported for other river herring populations. There were also significant withinyear spatial and temporal patterns in demography. Mean relative abundance and length were lowest and sex ratio was skewed towards male fish in the upstream portion of our study area; early migrants to our study area were typically larger and more likely to be female. These findings suggest that the portion of the Connecticut River Blueback Herring run migrating to the Holyoke Dam fish passage facility, the upper terminus of our study area at which this run has been enumerated annually since the 1970s, may not be representative of the abundance and demography in the more downstream areas, and that earlier migrants to the Connecticut River may make a disproportionately high contribution to annual reproductive output.

/pdf/population-and-trophic-dynamics-of-striped-bass-and-blueback-16pxs1fau5.pdf

Population and Trophic Dynamics of Striped Bass and Blueback Herring in the Connecticut River

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Population and Trophic Dynamics of Striped Bass and Blueback Herring in the Connecticut River