Maximum Economic Yield Fishery Management in the Face of Global Warming

Abstract

This paper deals with fishery management in the face of the ecological and economic effects of global warming. To achieve this, a dynamic bioeconomic model and model-based scenarios are considered, in which the stock's growth function depends on the sea surface temperature. The model is empirically calibrated for the French Guiana shrimp fishery using time series collected over the period 1993-2009. Three fishing effort strategies are then compared under two contrasted IPCC climate scenarios (RCP 8.5 and RCP 2.6). A first harvesting strategy maintains the Status Quo in terms of fishing effort. A more ecologically-oriented strategy based on the closure of the fishery is also considered. A third strategy, which relates to Maximum Economic Yield (MEY), is based on the optimisation of the net present value derived from fishing. The results first show that 'Status Quo' fishing intensity combined with global warming leads to the collapse of the fishery in the long run. Secondly, it turns out that the Closure strategy preserves stock viability especially under the optimistic climate scenario. Thirdly, the MEY strategy makes it possible to satisfy bioeconomic performances requirements with positive stock and profit, once again, especially under the optimistic warming scenario. Consequently, MEY emerges as a relevant bioeconomic strategy in terms of adaptation to climate change but only in connection with climate change mitigation.

Pengelolaan Perikanan Skala Kecil Di Perairan Pesisir Kabupaten Bangka Dengan Pendekatan Bioekonomi

“…Analisis bioekonomi yang dilakukan pada tiga zona menurut jenis ikan pelagis dan demersal menggunakan prinsip kehati-hatian (Charles, 2001) untuk mengetahui posisi effort dan produksi aktual berada pada kondisi efisien atau tidak, dimana basis dalam mengukur efisiensi menggunakan pendekatan laju penangkapan ikan maksimum yang diperbolehkan (Total Allowable Catch) yaitu 80% MEY (Maximum Economic Yield). Hal ini didasari bahwa MEY merupakan alat ukur yang lebih sesuai dikarenakan tidak hanya parameter biologi yang dijadikan acuan, tetapi juga parameter ekonomi, dimana keseimbangan antara keberlanjutan biologi dan maksimalisasi produksi dapat mempertahankan keberlanjutan perikanan (Diop et al, 2018;Mota, 2020). Total Allowable Catch (TAC) merupakan kontrol terhadap aktivitas penangkapan agar eksploitasi sumber daya ikan dapat ditekan.…”

Back to the future: A retrospective assessment of model‐based scenarios for the management of the shrimp fishery in French Guiana facing global change

“…Research showed that sea surface temperature increased, sea surface currents changed and the peak of phytoplankton production (bloom intensity) decreased off the coast of French Guiana over the period of interest. Some new empirical results brought some more evidence of environmental impacts of shrimp stock and production in French Guiana (Sanz et al, 2017;Diop et al, 2018aDiop et al, , 2018b. However, causal relationships between these environmental changes and the evolution of shrimp recruitment have not yet been formally identified.…”

Spatio-seasonal patterns of demersal fish communities on the French Guiana Coast

“…Fisheries activities have been shown to modify the spatial distribution of fish communities, population structure and size structure (Blaber, 2000;Camara et al, 2016;Perry, 2005). Rising sea-surface temperature can lead to a diminution of the net primary production produced by phytoplankton (Behrenfeld et al, 2006) having consequences on fisheries yields and food-web dynamics (Diop et al, 2018c(Diop et al, , 2018a(Diop et al, , 2018bHoegh-Guldberg and Bruno, 2010;Lampert, 2013;Ware, 2005).…”