Figure 3
From: Inferring the ecology of north-Pacific albacore tuna from catch-and-effort data
Catch per unit effort (CPUE) unveils the geographic and seasonal origins of each pseudo-cohort (P-C). Shown underneath each pseudo-cohort’s CPUE distribution are the corresponding mean body mass (diamond) and the 50th, 75th, and 95th body-mass percentile. Pseudo-cohorts 1 and 2 can mainly be found at relatively high—subtropical to temperate—latitudes, with hotspots off the coast of Japan in boreal winter and spring months. Pseudo-cohorts 3 and 4 are more likely to be found at lower—tropical and subtropical—latitudes, with hotspots in the western north Pacific in boreal winter months and central north Pacific throughout much of the year. We performed clustering of entries in the dataset based on mean body masses per fishing operation (see Methods). The dataset also contained the number of hooks employed, which enabled the estimation of CPUE for each entry and the creation of cluster-wise plots shown here.
