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Master of Public Health

A first glimpse of larval ecology of halibut species in the Gulf of St. Lawrence, Canada

AUTHORS

Ghinter L , Anderson C , Robert D , Winkler G , Bernatchez L , Audet C , . Journal of fish biology. 2023 1 3; ().

ABSTRACT

Knowledge on the larval ecology of winter-spawning fish from the Estuary and Gulf of St. Lawrence (EGSL), Canada, remains scarce due to the seasonal ice cover that prevents ichthyoplankton sampling using conventional methods. Two winter-spawning species, Atlantic halibut (Hippoglossus hippoglossus) and Greenland halibut (Reinhardtius hippoglossoides), support the most important groundfish fisheries of this area. In March 2020, we captured 10 halibut larvae ranging in size from 5 to 14 mm during an opportunistic survey in the GSL onboard an icebreaking vessel. Of these, eight were Atlantic halibut and two Greenland halibut. Judging by their very small size, the larvae were only a few days old, suggesting that the spawning grounds are close to the capture sites. This effort constitutes a first step in validating the putative spawning areas for these two important GSL stocks. This knowledge is important for the conservation and sustainable management of these fisheries.

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