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JPR Advance Access published online on April 29, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi019
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received October 18, 2004
Accepted April 5, 2005

Article

An exceptional haddock year-class and unusual environmental conditions on the Scotian Shelf in 1999

E.J.H. Head 1*, D. Brickman 1, and L.R. Harris 1

1 Ocean Sciences Division, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, N.S., B2Y 4A2, Canada

* To whom correspondence should be addressed.
E.J.H. Head, E-mail: HeadE{at}mar.dfo-mpo.gc.ca


  Abstract

The number of settled year-0 haddock on the eastern Scotian Shelf in July 1999 was the highest seen since record keeping began in 1970. The average length indicated most had hatched in late February, well before the historical peak spawning period. In the data record above average year-0 abundance leads to good recruitment, suggesting that early spawning incurs survivability advantages. Conditions may have been particularly favourable for haddock recruitment in 1999: (a) because an unusually large number of adults spawned early; and (b) because the earliest larval stages encountered an unusually plentiful supply of food, since the spring bloom and C. finmarchicus reproduction peaked in late February, 2-4 weeks earlier than usual.


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