NAFO posted on October 01, 1999 12:47
S. E. Wigley
National Marine Fisheries Service, Northeast Fisheries Science Center
Woods Hole, MA 02543 USA
Source - Journal of Northwest Atlantic Fishery Science, Volume 25: 215-218
ISSN-0250-6408
S. E. Wigley. 2000. Effects of First-time Spawners on Stock Recruitment Relationships for Two Groundfish Species. J. Northw. Atl. Fish. Sci., 25: 215-218. https://doi.org/10.2960/J.v25.a19
Abstract
Recent experimental studies suggest that first-time spawning fish may not be as reproductively fit as repeat spawners. Traditional stock-recruitment models consider all mature fish as equivalent contributors to the spawning stock biomass. In this study we examine the effects of discounting first-time spawners on the stock-recruitment relationship of two species with varying life histories: Georges Bank haddock (Melanogrammus aeglefinus), a fast maturing gadoid, and Gulf of Maine witch flounder (Glyptocephalus cynoglossus), a slow maturing pleuronectid. Proportions of first-time spawning haddock ranged from 3 to 62 percent of the spawning stock biomass during 1963-96. Exclusion of all first-time spawners from spawning stock biomass improved the Ricker stock-recruitment relationship by 39 percent. For witch flounder, proportions of first-time spawners were less variable, never exceeding about 30 percent. Adjusting the spawning stock biomass for first-time spawners did not improved the overall relationship for witch flounder.
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Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - October 1999
Publication Type - Journal Note
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Citation: S. E. Wigley. 2000. Effects of First-time Spawners on Stock Recruitment Relationships for Two Groundfish Species. J. Northw. Atl. Fish. Sci., 25: 215-218. https://doi.org/10.2960/J.v25.a19