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Modeling the drift of European (Anguilla anguilla) and American (Anguilla rostrata) eel larvae during the year of spawning

Journal article
Authors Håkan Westerberg
Selma Pacariz
Lasse Marohn
Vilhelm Fagerström
Klaus Wysujack
Michael J. Miller
Marko Freese
Jan Dag Pohlmann
Reinhold Hanel
Published in Canadian Journal of Fisheries and Aquatic Sciences
Volume 75
Pages 224-234
ISSN 0706-652X
Publication year 2018
Published at Department of marine sciences
Pages 224-234
Language en
Links https://doi.org/10.1139/cjfas-2016-...
Subject categories Freshwater ecology

Abstract

© 2018, Canadian Science Publishing. All rights reserved. The distribution of the leptocephalus larvae of European (Anguilla anguilla) and American (Anguilla rostrata) eels collected during recent Sargasso Sea surveys was used to model larval drift. The drift trajectories of individual larva were back-calculated to the estimated time of spawning, using current data from two global oceanographic assimilation models. The results of both models give the same overall result; widespread spawning extended in time from December to March. The drift was also calculated forwards for approximately 1 year. The forward drift modelling showed that most leptocephali remained in the area south of the Subtropical Frontal Zone. One conclusion is that the majority of leptocephali remain trapped and possibly die in the retention area. A small proportion of leptocephali are entrained into the Gulf Stream system. An implication is that the spawning success may be highly sensitive to oceanographic and climatic factors that alter the dispersion of leptocephali out from the retention area. An alternative interpretation is that the surveys were made too late after the peak spawning period and that the core spawning area was missed.

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