Stock identification of eulachon (Thaleichthys pacificus), an anadromoussmelt in the eastern Pacific ...

• Main Authors: Hay, Douglas E., Beacham, Terry D.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2005 - K - Theme session 2024
• Subjects: Fisheries and aquaculture; Pressures, impacts, conservation, and management; Bering Sea
• Online Access: https://dx.doi.org/10.17895/ices.pub.25350181.v1; https://ices-library.figshare.com/articles/conference_contribution/Stock_identification_of_eulachon_Thaleichthys_pacificus_an_anadromoussmelt_in_the_eastern_Pacific/25350181/1

No abstracts are to be cited without prior reference to the author.The anadromous eulachon (Thaleichthys pacificus) occurs from northern California to the Bering Sea but the number of populations is small (<100). Many populations declined suddenly in the 1990’s raising conservation concerns. In the last 70 years eulachon population structure has been examined by five approaches, from eight or more independent studies. Early meristic variation showed differences between populations in southern and northern populations, but no significant differences from adjacent populations. Comparison of life history traits (spawning time and larval distributions) and comparisons of elemental analyses in otoliths also reached similar conclusions. No approach provided a definitive answer to the basic problem of whether there was significant reproductive isolation among the populations: any or all of the observed differences could have been acquired. The first two genetic analyses (a mitochondrial DNA and another ...