Abstract--This study assessed the aging techniques and growth rates of river herring, the alewife (Alosa pseudoharengus
) and blueback herring (Alosa aestivalis), in the tributaries of the Potomac River in northern Virginia.
Water flowed through the passage, ready to welcome the annual spring migration of alewife (Alosa pseudoharengus
), and enable these fish to reach the lake for the first time in more than 100 years.
Concordant with the increase in mussel numbers was a decrease in invasive Alewife Alosa pseudoharengus
(Bunnell et al., 2015; Warner et al., 2015), which are known to have negative impacts on numerous Lake Michigan fish species via predation on larvae and smaller individuals (Madenjian et al, 2008).
(2015) provided evidence of homogenization of Alosa pseudoharengus
, showing that genetic isolation by distance was non-significant among stocked populations, but significant among natural populations.
(148) See, e.g., Hare et al., supra note 145, at 22 ("Alewife [(Alosa pseudoharengus
)] and American Shad [(Alosa sapidissima)] have exhibited some of the greatest shifts in distribution in the ecosystem, but the potential for a change in species distribution was low.").
(1976) observed critical thermal maximum in the alewife (Alosa pseudoharengus
) and noted no effect of age (and presumably size).
Seven species are introduced in the Chicago region: Common Carp (Cyprinus carpio), Alewife (Alosa pseudoharengus
), Goldfish (Carassius auratus), Chinook Salmon (Oncorhynchus tshawytseha), Redear Sunfish (Lepomis microlophus), White Perch (Morone americana), and Round Goby (Neogobius melanostomus), but many others owe their presence in Wolf Lake to human intervention.
A single person later was chosen by ballot to be the shellfish warden, overseeing the shellfish and the river herring, Alosa pseudoharengus
(alewife) and Alosa aestivalis (blueback).
Latent survival of impinged individuals varied widely, with several highly abundant species exhibiting better than 50% survivorship, while alewives (Alosa pseudoharengus
) and blueback herring (Alosa aestivalis) displayed very high mortality rates after a four-day holding period.
The emerald shiner, once extremely abundant in the Great Lakes, but now reduced in number dramatically, attributed to competition with the alewife (Alosa pseudoharengus
), has been spread inland by stocking and angler releases of bait fish.
Exclusion of adult alewife, Alosa pseudoharengus
, using low-frequency sound for application at water intakes.
The new roughened ramp allows passage not only for Atlantic salmon but also for alewives (Alosa pseudoharengus
), blueback herring (Alosa aestivalis), American eel (Anguilla rostrata), rainbow smelt (Osmerus mordax), and American shad (Alosa sapidissima), all of which had largely been eliminated from the upper half of the St.