A model to assess trade-offs between environmental impact and profitability of offshore salmon farms: A case study on Chile

ABSTRACT

In recent decades, aquaculture has emerged as a viable method to help supply the growing global demand for seafood; however, expansion of the industry comes with potential negative impacts. Regulatory decisions governing aspects like aquaculture farming practices and farm siting inherently lead to trade-offs between profitability and the health of the surrounding environment through impacts including pollution, disease, and disturbance from escaped fish. Efficiently and sustainably scaling up aquaculture will require the development of methods for explicitly examining the trade-offs among these impacts and socioeconomic objectives. We developed a model to assess these trade-offs and illustrate the approach with a case study of salmon aquaculture in southern Chile. In the case study we found evidence that all 21 farms with approved permits may be underperforming on both profitability and the protection of ecosystem health. Our model suggests that explicit evaluation of trade-offs can illuminate the potential for improvements on multiple outcomes simultaneously.

KEYWORDS:

• Aquaculture
• bioeconomic model
• Chile
• coastal industries
• farmed salmon
• trade-off analysis