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. 2006 Nov 28;4(12):e415. doi: 10.1371/journal.pbio.0040415

Figure 3. California Commercial White Abalone Haliotis sorenseni Landings for 1972–1992.

Figure 3

The price exponentially increased as catch decreased. The catch takes the fishing effort into account, so that decreased catch does not come from a diminishing effort. Results are given as weight in shell divided by the number of ships (open squares) and price (filled circles) [27].