Author: Stephanie L. Shaw
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 154

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Author: Stefan Tucker
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 176

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Book Description
Lake Sturgeon (Acipenser fulvescens) populations have experienced declines throughout much of the Great Lakes and are currently a target for restoration. The Lower Fox River is a highly modified river system that hosts a small remnant Lake Sturgeon population. Previous work confirms annual spawning and some natural reproduction but inconsistent monitoring yields little understanding to current status and sustainability of this population. Chapter 1 describes the biological attributes of the spawning adult stock during 2017-2019 and the environmental conditions surrounding these annual events. In addition to a demographic description of adults, spawning habitat quantity and quality were evaluated to showcase reproductive potential of Lake Sturgeon below the De Pere Dam in the Lower Fox River, Wisconsin. Our description of adult demographics suggest adequate population structure exists to support reproductive success and spawning occurs during favorable seasonal conditions; therefore this population should be capable of significantly higher levels of larval production. Examinations of spawning substrates, incubation habitats and egg predation identified several factors influencing the reproductive success of this population. Locations of spawning activity are problematic on this system due to temporal desiccation events, algae colonization and egg/larval dislodgment which may severely restrict egg and larval survival. Consistent monitoring of spawning adults and larval production would continue to describe the stability of this population. Improvements to habitat quality and quantity should become priority restoration actions to ensure reproductive success. The ability to improve egg and larval survival would provide the opportunity to assign restoration targets and assess the effectiveness of restoration strategies for this population. Chapter 2 continues to evaluate Lake Sturgeon habitat availability in the Lower Fox River by investigating the riverine use of juveniles. Expanding knowledge pertaining to early life stage habitats and movement patterns are listed as a critical need for management. Documented low levels of production within this river system make it uncertain if wild juveniles are present and to what extent nursery habitats exist. Previous habitat models suggest ample juvenile habitat is present, however a legacy of pollution and recent restoration actives to remove contained sediments and improve river condition, make it uncertain if the river is utilized as a nursery area. Age-0 Lake Sturgeon were implanted with hydro-acoustic transmitters and tracked for 40 days during late summer in 2018 and 2019 to document movement patterns and areas of occupancy in the Lower Fox River. Results demonstrate that juvenile Lake Sturgeon will reside in the river system for extended periods of time and congregate into focal habitat areas. Six core habitat areas were identified in the upper river section suggesting the presence of functional nursery habitat. This is the first documentation of juvenile Lake Sturgeon habitat use following restoration activities in the Lower Fox River and will serve to help guide future habitat improvements and further knowledge of juvenile life stage ecology in this river system. The information gathered in this study provides a greater understanding to the reproductive limitations of this population and early life history needs as well as assign restoration targets to improve Lake Sturgeon sustainability in the Lower Fox River.

Author: John Seyler
Publisher: South Porcupine : Northeast Science & Technology, Ontario Ministry of Natural Resources
ISBN:
Category : Nature
Languages : en
Pages : 34

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Describes a field study designed to establish seasonal habitat use relationships for adult lake sturgeon on the Groundhog River, north-eastern Ontario. The study was conducted in 1996 and examined lake sturgeon habitat use during spring and autumn seasons, representing high and low water conditions respectively. Fish were netted in randomly chosen locations in the study area, upstream and downstream of the Camus Rapids, and were measured, weighed, marked, and released. Catch, meristic, and habitat parameter data were entered into an electronic data base and analyzed using the SYSTAT program. Results presented include sturgeon length frequency distributions, substrate and depth preferences exhibited, and stream velocity preferences.

Author: Thomas C. Hughes
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 24

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Author: William John Knox Harkness
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 134

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Book Description

Author: Matt Lebron
Publisher:
ISBN: 9780494844731
Category :
Languages : en
Pages :

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Author: James Andrew Crossman
Publisher:
ISBN:
Category : Fish stocking
Languages : en
Pages : 388

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Book Description

Author: Matthew Lebron
Publisher:
ISBN:
Category : Lake ecology
Languages : en
Pages : 0

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Book Description
"Study area : Rainy Lake and the Namakan Reservoice, which includes Kabetogama and Namakan lakes, are situated on the U.S./Canadian border east of International Falls, Minnesota, and Fort Frances, Ontario. Voyageurs National Park encompasses portions of Rainy Lake's south arm and has a total area of 88,628 ha, 34,400 ha of which is water. This study will be restricted to the South Arm of Rainy Lake, the largest surface area at 49,200 ha.--leaf 11.

Author: Nathan M. Caswell
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 240

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Author: Shawna Leigh Kjartanson
Publisher:
ISBN: 9780494599983
Category :
Languages : en
Pages : 0

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Book Description
The lake sturgeon (Acipenser fulvescens), is a species with considerable ecological, social and economic value. Unfortunately, over-exploitation and habitat alteration have led to the collapse of lake sturgeon fisheries across North America. Based on conservation concerns, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) identified eight designatable units (DUs) among Canadian populations of lake sturgeon using the limited information available. These DUs are intended to represent taxonomically, genetically, geographically, or biogeographically distinct units below the species level. In this study, the genetic structuring among 20 lake sturgeon localities was examined using nine microsatellite loci. Lake sturgeon localities conformed to hierarchical partitioning of genetic diversity, with the greatest genetic divergence between localities in the Great Lakes and Hudson Bay drainages. Finally, minimal divergences among the current DUs warrant adjustment of lake sturgeon DU boundaries, to more appropriately reflect the distribution of genetic differentiation among lake sturgeon localities.