Application of a new modelling framework for the assessment of Pacific herring (Clupea Pallasii) major stocks and implementation in the management strategy evaluation process / Samuel D.N. Johnson, Sean... : Fs70-5/2024-066E-PDF

"This paper presents a new stock assessment and operating model framework for Pacific Herring (Clupea pallasii) that combines time-varying natural mortality, fishery reference points, and future harvest strategies. We develop and test a new Spatially Integrated Statistical Catchat-Age Herring (SISCAH) model that incorporates, inter alia, a density dependent process for natural mortality, explicit representation of spawn-on-kelp fisheries, fisheries with discrete removal events over a short season, a single spawn index that blends dive and surface survey designs, and an age-composition likelihood function that accounts for correlation in residuals among age-classes"--Abstract, page vi.

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