Milt volume influences the probability of egg fertilization in lake sturgeon (
            <i>Acipenser fulvescens,</i>
            Rafinesque, 1817)

Tucker, Stefan; Grimm, Angela N.; Crossman, James A.; Scribner, Kim T.; Forsythe, Patrick S.

doi:10.1111/jai.14031

Cited by 1 publication

(1 citation statement)

References 22 publications

(42 reference statements)

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“…For example, estimated ages of spawning adults suggest the LFR hosts newly mature males (age 11) and females (age 24), and more than 20 different year classes. Spawning sex ratios (male: female) were also within the documented range of most populations (i.e., 1:1.1; Roussow, 1957 and 9.6:1; Lyons & Kempinger, 1992), and combined with fecundity estimates, suggests a large quantity of eggs are available for deposition with a high probability of fertilization success (Tucker et al, 2020).…”

Section: Discussionmentioning

confidence: 95%

Reproductive status of a remnant Lake sturgeon (Acipenser fulvescens) population: Spawning and larval drift in the lower Fox River, Wisconsin

Tucker

Houghton

Harris

et al. 2021

River Research & Apps

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The Lower Fox River is a modified tributary of Green Bay, Lake Michigan that hosts a remnant Lake Sturgeon (Acipenser fulvescens) population. Reproduction has been confirmed, although annual spawning events have been described as small and concerns regarding the long‐term viability of the population remain. Contemporary and comprehensive surveys of spawning habitat, spawning stock, and production to the larval stage have not been conducted. The goal of this study was to describe spawning habitat, determine the size and demographic structure of the spawning stock, and quantify larval production (2017–2019) to identify impediments to population growth and recovery. Over 130 adults were present during annual spawning runs and spawning activity was consistently concentrated along the eastern riverbank. Adequate population structure exists to support reproductive success, but larval catch was low, ranging from 0 to 14 larvae captured annually. Evaluation of the riverbed below the De Pere Dam suggests the extent of the substrate available for spawning adult Lake Sturgeon is lower (~70% less) than previously described. Habitat deemed suitable for spawning exists offshore below the dam, but most habitat used for spawning is arranged along the eastern man‐made shoreline. However, nearshore spawning is problematic at this location due to fluctuating discharge from dam operation and periodic seiche events. Possible impediments limiting the success of Lake Sturgeon reproduction include dewatering of eggs, retention of eggs and larvae, algae colonization, and egg predation. We discuss these issues in the context of previous Lake Sturgeon research, future monitoring of spawning adults/larval production, and the likelihood that river habitat improvement will foster increased reproductive success.

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Section: Discussionmentioning

confidence: 95%