Journal
TRANSACTIONS OF THE AMERICAN FISHERIES SOCIETY
Volume 144, Issue 2, Pages 246-257Publisher
WILEY
DOI: 10.1080/00028487.2014.975841
Keywords
-
Categories
Funding
- Great Lakes Fishery Commission
- SARCEP (DFO)
- Quebec-Ocean
- Biology Department of Universite Laval
- Ressources Aquatique Quebec
Ask authors/readers for more resources
Freshwater eels Anguilla spp. are declining worldwide, and a major challenge is understanding why these panmictic species show contrasting patterns of intraspecific phenotypic variation and recruitment. We present results on studies of the American Eel A. rostrata to understand and discriminate the effects of origin and plasticity on growth and sex determination. We considered two separate growth and one length-at-age data sets. The first growth data set originated from a 34-month rearing experiment starting from the glass eel life stage to test the effects of origin, salinity, and density on growth and sex determination. The second growth data set originated from a shorter rearing experiment of 18 months starting at the yellow eel stage (around 3 years old) and compared transplanted individuals in Lake Ontario (LO) with natural migrants to the LO area. The third data set compared transplanted individuals in LO sampled by electrofishing with naturally migrating individuals. Sex ratios were identical for all origins and treatments in the long-term growth experiment (34-35% females). While male size distribution had little variability, certain female groups had a large variation in growth and presented fast-and slow-growing clusters. On the other hand, both cases of natural migrants to the LO area were consistent with being only slow-growing females. We found that wild individuals rearing in the LO area were nearly exclusively transplanted individuals and that males, as well as fast-growing females, were present. Even though the entire species is panmictic, these results support a role for spatially varying selection in explaining the phenotypic variation observed among regions and among individuals of the same region, and such factors must be considered for any successful management strategies of American Eel.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available