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Loher, T., and A. Seitz. 2008. Characterization of active spawning season and depth for eastern Pa-cific halibut (Hippoglossus stenolepis), and evidence of probable skipped spawning. J. Northw. Atl. Fish. Sci., 41: 23–36. doi: 10.2960/J.v41.m617 The eastern Pacific halibut (Hippoglossus stenolepis) fishery is prosecuted over a nine-month season with a provision to cease harvests if stock declines to historically-observed minimum spawn-ing biomass. The industry has requested to extend fishing into winter, but little information exists regarding potential impacts on spawning aggregations or effective spawning biomass. A strictly an-nual spawning cycle is presumed, but some adults fail to undertake the offshore migration associated with continental slope spawning. We examined depth records of halibut tagged with Pop-up Archival Transmitting (PAT) tags for evidence of offshore seasonal migration (n = 72). For tags that were physically recovered (n = 16) we identified the occurrence of abrupt (~100 m) mid-winter ascents, believed to be egg release. The active spawning season, defined by occurrence of these rises, lasted from 27 December–8 March, at bottom depths of 278–594 m. Eighteen percent of tagged halibut remained onshore. Thirty-one percent of fish with detailed archival records did not exhibit spawnin

journal/e-journal of northwest atlantic fishery science/journal of northwest atlantic fishery science/journal of northwest fishery science

Characterization of Active Spawning Season and Depth for Eastern Pacific Halibut (<i>Hippoglossus stenolepis</i>), and Evidence of Probable Skipped Spawning

Characterization of Active Spawning Season and Depth for Eastern Pacific Halibut (Hippoglossus stenolepis), and Evidence of Probable Skipped Spawning