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An integrated stock assessment for red spiny lobster (Panulirus penicillatus) from the Galapagos Marine Reserve

Abstract:

The population of red spiny lobster (Panulirus penicillatus) around the Galapagos Islands has supported a fishery since the 1960s. However, conservation concerns have been raised given signs of over-exploitation observed during the mid-2000s, including decreasing trends in catch per unit effort (CPUE), yield, and profitability. We developed an integrated, size-structured assessment method to estimate trends in fishing mortality, recruitment, and mature biomass. A posterior distribution of spawning potential ratio (SPR) in 2011 was calculated using Bayesian methods and had a median of 44%, which is higher than most commonly used reference points (e.g. SPR = 40%). However, there are uncertainties in our estimates and continued monitoring with standardized data collection protocols should be a priority for future work in this fishery. Management should work toward establishing science-based management strategies that consider both the needs of fishing communities and the imperative to conserve unique ecosystems such as the Galapagos Islands.