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The bioeconomic paradox of market-based invasive species harvest: a case study of the commercial lionfish fishery

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Abstract

Commercialized harvest for invasive species offers a compelling solution to control their abundances and reduce their impacts on ecosystems. However, reducing an invasive species’ population will reduce their catch rates and can make their harvest uneconomical. We examined this apparent paradox with a bioeconomic case study of invasive lionfish (Pterois volitans) on artificial reefs in the northeastern Gulf of Mexico (nGOM). Different methodological approaches provided the first estimates for the intrinsic growth rate (r) and environmental carrying capacity (K) of the nGOM lionfish population. With these estimated parameters, we calculated open access equilibrium (OAE) solutions for stock, yield, and effort, and then assessed what harvest levels would be needed to deplete the population beyond maximum sustainable yield (MSY). Overall, lionfish demonstrated strong compensation and were robust to fishing pressure. The r-values estimated suggest that lionfish densities may be hyperstable on artificial reefs, and the range of estimated K-values indicated uncertainty regarding the level of natural population control. Our models projected that a stable OAE fishery could develop, but that the potential profits in the fishery were relatively small. Under current market conditions, harvest at the estimated OAE solution produced annual yields slightly less than MSY. Alternative market scenarios simulated further decreases in lionfish biomass if the ex-vessel price was higher or fishing costs were lower, and we discuss private and public mechanisms that could incentivize fishing efforts via product marketing, value-added products, or subsidies. Collectively, these models provide estimates of life history parameters for understanding lionfish population dynamics and harvest, examine fundamental assumptions for commercialized invasive species harvest, and explore how economic strategies could support invasive species control.

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All models and analyses are reproducible with the data and spreadsheets provided in “Appendix I” in the supplementary materials.

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Acknowledgements

We thank Alex Fogg (Okaloosa County) for unpublished data and feedback, Kristen Dahl (NOAA) for data, and Alexandria Tucker (UF) for help with Mathematica and review. Long-term ROV lionfish surveys were conducted in part by Joe Tarnecki (UF) and Steve Garner (UF) with assistance from Jordan Bajema (UF), Jessica Van Vaerenbergh (USF), and Miaya Glabach (UF). Steve Brown (FWC) and Hanna Tillotson (Florida DEP) helped source data for commercial spearfishing landings. We thank the editors and anonymous referees of Biological Invasions for their rigorous reviews and guidance.

Funding

Support for H. Harris was provided in part by the National Science Foundation Graduate Research Fellowship Program (Grant Nos. DGE-1315138 and DGE-182473). Support for the long-term ROV surveys was made possible in part by the BP/Gulf of Mexico Research Initiative/C-IMAGE II, the Florida Fish and Wildlife Conservation Commission (grant no. 16091), and the Florida RESTORE Act Centers of Excellence Program (Grant No. 4710-1126-00-A). Opinions, findings, or conclusions expressed in this document are from the authors alone and do not necessarily reflect the views of our employing or supporting organizations.

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Contributions

HH conceived this study with help from SL and RA. WP and HH oversaw long-term ROV lionfish density survey data and management. HH developed the models with guidance from SL, MA, RA, and DC. HH produced the tables and figures. The manuscript was written by HH who oversaw revisions with input from co-authors. All authors reviewed and approved the paper, and they consent to its publication.

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Correspondence to Holden E. Harris.

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The authors declare no competing interests. The State of Florida appropriations for lionfish programs referenced in the discussion has contributed to research funding for this and other studies by the authors.

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Harris, H.E., Patterson, W.F., Ahrens, R.N.M. et al. The bioeconomic paradox of market-based invasive species harvest: a case study of the commercial lionfish fishery. Biol Invasions 25, 1595–1612 (2023). https://doi.org/10.1007/s10530-023-02998-5

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  • DOI: https://doi.org/10.1007/s10530-023-02998-5

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