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Our objective was to develop a method that could discriminate herring stocks over fine spatial scales. To meet this objective, the Auke Bay Laboratory (ABL), in conjunction with the Alaska Department of Fish and Game (ADF&G), compared the use of otolith microchemistry and fatty acid analysis of heart enzymes lipids as tools for discriminating NGA herring stocks. We sampled spawning herring from a diversity of sites, some adjacent enzymes in geographic location and others separated distinctly. This allowed us to examine the utility of these methods for discriminating stocks known to differ genetically, and then apply the methods to stocks that enzymes have proven difficult to discriminate. Otoliths and hearts were sampled from spawning populations in spring 2001. Approximately 30 female herring from Sitka Sound, Togiak Bay, Kodiak, Kamishak Bay in Cook Inlet, Montague Island, and Fairmont Bay in Prince William Sound were sampled. Initially, the samples from Kodiak, Kamishak, Montague, and Fairmont were combined into a single group identified as NGA.
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