Understanding the basis of shortnose sturgeon (Acipenser brevirostrum) partial migration in the Gulf of Maine

Canadian Journal of Fisheries and Aquatic Sciences
By: , and 

Links

Abstract

Movement of shortnose sturgeon (Acipenser brevirostrum) among major river systems in the Gulf of Maine is common and has implications for the management of this endangered species. Directed movements of 61 telemetered individuals monitored between 2010 and 2013 were associated with the river of tagging and individual characteristics. While a small proportion of fish tagged in the Kennebec River moved to the Penobscot River (5%), a much higher proportion of fish tagged in the Penobscot River moved to the Kennebec River (66%), during probable spawning windows. This suggests that Penobscot River fish derive from a migratory contingent within a larger Kennebec River population. Despite this connectivity, fish captured in the Penobscot River were larger (∼100 mm fork length) and had higher condition factors (median Fulton’s K: 0.76) than those captured in the Kennebec River (median Fulton’s K: 0.61). Increased abundance and resource limitation in the Kennebec River may be constraining growth and promoting migration to the Penobscot River by individuals with sufficient initial size and condition. Migrants could experience an adaptive reproductive advantage relative to nonmigratory individuals.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Understanding the basis of shortnose sturgeon (Acipenser brevirostrum) partial migration in the Gulf of Maine
Series title Canadian Journal of Fisheries and Aquatic Sciences
DOI 10.1139/cjfas-2017-0083
Volume 75
Issue 3
Year Published 2018
Language English
Publisher NRC Research Press
Contributing office(s) Coop Res Unit Leetown
Description 10 p.
First page 464
Last page 473
Country United States
State Maine
Other Geospatial Gulf of Maine