Figure 2 - uploaded by Beau Doherty
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An annual time-step in the Pacific Herring statistical catch-at-age (SCAH) model showing Herring migrations between inshore and offshore, spawn timing (January-June), recruitment, fisheries, and predation. Arrows to predator boxes (grey) indicate losses due to predation mortality from Pacific Hake (HAKE), Humpback Whales (HBW), SSL, and HS. The SCAH annual time-step runs from July 1 to June 30 with spawning occurring at the end of each year. Arrows from recruitment boxes (blue) indicate recruitment of juveniles hatched from eggs deposited during the previous year's spawning events. Recruits do not migrate offshore during the feeding season, but are subject to inshore predation before mixing with age-2+ herring returning from the offshore (green arrow on far left) during the spawning season. The top panel shows average weekly (vertical bars) and cumulative (dashed line) proportion of spawn for inshore spawning grounds along with timing for roe and SOK fisheries.
Source publication
The recovery of marine mammals from historical over-exploitation in the 1970s represents one of the largest changes in trophic structure in the northeast Pacific Ocean over the last century, for which the impacts on key forage species such as Pacific Herring ( Clupea pallasii ) are poorly understood. This has prompted hypotheses that increasing mar...
Context in source publication
Context 1
... bioenergetic models from step 2 and predator abundance from step 3 (see the 'Estimating historical predation mortality rates' section). (5) Fit Pacific Herring catch-at-age model using historical survey and fisheries data from step 1 and estimates of predator consumption from step 4 (see the 'Catch-atage model with predation mortality' section, Fig. 2, and Supplementary Material A). (6) Predict future predator consumption using relationships between prey density, predator density, and predation mortality (see the 'Modelling future predation mortality rates' section). (7) Estimate unfished equilibrium states using a simulation approach to project WCVI Pacific Herring and predator ...
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The recovery of marine mammals from historical over-exploitation in the 1970s represents one of the largest changes in trophic structure in the northeast Pacific Ocean over the last century, for which the impacts on key forage species such as Pacific Herring (Clupea pallasii) are poorly understood. This has prompted hypotheses that increasing marin...
