Genetic Investigation of the Resurgence of American Shad in the Susquehanna River PDF Download

Author: Robert W. Chapman
Publisher:
ISBN:
Category : American shad
Languages : en
Pages : 34

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Book Description

Author: Bonnie L. Brown
Publisher:
ISBN:
Category : American shad
Languages : en
Pages : 39

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Book Description
"Yearly release of shad fry and of live pre-spawned adult shad from six other source rivers accompanied the lift operation beginning in 1982 ... In view of the apparent success of shad management efforts in Susquehanna River, a program of study was proposed to the Maryland DNR Chesapeake Bay Research and Monitoring Division's Power Plant Topical Research Program designed to examine population dynamics underlying the resurgent American shad population in Susquehanna River using molecular genetic techniques."--P. 4.

Author:
Publisher:
ISBN:
Category : American shad
Languages : en
Pages : 72

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Book Description

Author: Richard Gerstell
Publisher: Penn State Press
ISBN: 9780271040769
Category : American shad
Languages : en
Pages : 234

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Book Description

Author: Brian W. Bowen
Publisher:
ISBN:
Category : Rare reptiles
Languages : en
Pages : 184

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Book Description

Author: Aaron Aunins
Publisher:
ISBN:
Category : Biotelemetry
Languages : en
Pages :

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Book Description
The American shad Alosa sapidissima has experienced severe declines throughout its native range due to habitat degradation, fragmentation, and over-fishing. Hatchery supplementation is often used for stock restoration, but the effects of supplementation on population structure and genetic diversity are rarely assessed. This study employed molecular markers to evaluate how supplementation of the James River American shad population with Pamunkey River origin larvae since 1994 has impacted genetic diversity and population structure. Population genetic parameters of other major Chesapeake Bay tributaries (Susquehanna, Rappahannock, Potomac, and Nanticoke) also were characterized. Prior to stocking, the James and Pamunkey populations exhibited subtle genetic differentiation, which was absent among post-supplementation samples, presumably due to the stockings. A similar situation was observed among other shad populations of Chesapeake Bay tributaries which were subtly differentiated in the 1990s but lacked any credible among-population differentiation among contemporary samples. Genetic diversity of the James River shad population was high prior to stocking, and remained high throughout years of intensive supplementation, yet the current population decline suggests that the James River shad population still has not recovered. Despite harvest curtailment, elimination of the ocean intercept fishery, and widespread supplementation efforts, Chesapeake Bay tributary American shad populations are collectively at their lowest levels in recorded history. Therefore, success of other restoration goals such as creation of fish passage in James River was investigated in a concurrent radio telemetry study to assess passage at Bosher's Dam fishway. Ninety-four American shad were radio-tagged on the spawning grounds below Bosher's Dam. Approximately one-half of the tagged shad were detected at the escapement receiver within 24 hours after tagging, and the average residence times of remaining shad were approximately one week. No tagged shad were detected above Bosher's Dam. These results imply that restricted passage through Bosher's Dam fishway may be an important factor in the failure of James River American shad to recover. Therefore, improving passage at migratory barriers such as Bosher's Dam, in conjunction with a continued Bay-wide fishing moratorium, may be more beneficial to shad restoration efforts in James and other Chesapeake Bay tributaries than continued supplementation.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Charles H. Walburg
Publisher:
ISBN:
Category : American shad
Languages : en
Pages : 18

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Book Description

Author: Maryland. Tidal Fisheries Division
Publisher:
ISBN:
Category : American shad
Languages : en
Pages : 70

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Book Description

Author:
Publisher:
ISBN:
Category : American shad
Languages : en
Pages : 60

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Book Description
Biological studies conducted from 1963 to 1966 to determine the suitability of the Susquehanna River and its principal tributaries for the restoration of runs of American Shad are summarized herein. Objectives of the studies were to determine the suitability of the Susquehanna River between and above existing dams to support shad populations, study the behavior of young and adult shad between and above the impoundments, and the tolerances of egg and larval stages of shad to selected potential limiting factors of the environment.