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Description:The Southwest Fisheries Science Center (SWFSC) regularly conducts shore-based surveys of eastern North Pacific (ENP) gray whales (Eschrichtius robustus) to estimate abundance. These estimates are obtained from visual survey data collected off central California between December and February during the gray whale southward migration, and provide regular updates to a time series of estimates that began in 1967 (see Laake et al. 2012, Durban et al. 2015; 2017). Surveys have recorded a generally increasing trend in ENP gray whale abundance, with the most recent estimate from 2016 of 26,960 whales, indicating that the population has roughly doubled since 1967 when it was estimated at 13,426 whales (Fig. 1). This report presents a new estimate of abundance for ENP gray whales migrating southward off the central California coast between December and February 2019/20.
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