Browsing by Author "Linnansaari, T."

Now showing 1 - 4 of 4
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    Mactaquac Aquatic Ecosystem Study Report Series 2015-016, Fish passage in large rivers: a literature review
    (2015) Linnansaari, T.; Wallace, B.; Curry, R. Allen; Yamazaki, Gord
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    Movements of juvenile and sub-adult striped bass Morone saxatilis in the Saint John River, New Brunswick, Canada
    (Inter-Research, 2020-11-05) Andrews, S.N.; Linnansaari, T.; Leblanc, N.M.; Pavey, S.A.; Curry, R.A.
    Juvenile striped bass (age-1) of distinct genetic ancestry were re-discovered in the Saint John River, New Brunswick in 2014 after a 35 yr hiatus of recognition. These juveniles were determined to be highly genetically divergent from all possible source populations, hypothesized to be of Saint John River ancestry, and thus considered evidence of the continued existence of the native stock. Successful recruitment of strong year classes of striped bass within the Saint John River, however, appears to be infrequent. We acoustically tagged and tracked juvenile and sub-adult striped bass (n = 37; age 2-4) in the Saint John River in both 2015 and 2016, and identified summer feeding and overwintering habitats that established an in-river residency. Following decades of poor or no recruitment of the native striped bass stock, it is now imperative that managers quickly include monitoring of juvenile and sub-adult striped bass and protection of their habitats in the conservation and recovery efforts for Saint John River striped bass.
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    Winter ecology of striped bass (Morone saxatilis) near its northern limit of distribution in the Saint John River, New Brunswick
    (Springer, 2020-10-10) Andrews, S. N.; Linnansaari, T.; Curry, R. A.; Leblanc, N. M.; Pavey, S. A.
    Winter habitat selection by Striped Bass (Morone saxatilis) has been described as opportunistic, but due to the length and severity of winter at its northern range, winter habitats in the north are predicted to be restricted in distribution and carefully selected. Here we describe the locations and environmental conditions supporting winter aggregations of adult Striped Bass including periods under ice cover in the Saint John River, New Brunswick using acoustic telemetry. Striped Bass of both Saint John River (72%) and other ancestry (28%) were observed to overwinter within the river’s four mainstem lakes and embayments to which the individuals returned each fall. Most non-Saint John River ancestry Striped Bass were observed in habitats nearest the river mouth in winter. Striped Bass travelled to winter habitats from fall feeding locations from October to November, and only four tagged individuals departed the river at this time. Temperature, dissolved oxygen, and salinity conditions best described the winter habitats. By demonstrating the non-random distribution of Striped Bass during winter and identifying a gradient of habitat use by Saint John River ancestry Striped Bass in this northern river system, it is apparent that protection of these locations is critical for the long term conservation of Striped Bass populations in Canada.