Abstract
Commentary: Combining Ecosystem and Single-Species Modeling to Provide Ecosystem-Based Fisheries Management Advice Within Current Management Systems
Highlights
Legislation mandates a holistic approach, and many countries have formally committed to Ecosystem-Based Fisheries Management (EBFM), progress toward this has been slow
Two case studies are presented, (a) Atlantic menhaden Brevoortia tyrannus, where quotas are adjusted downwards to ensure that there is enough food for predators, and (b) the Irish Sea, where the ICES “Pretty Good Yield” (PGY) ranges that were originally designed to allow flexibility in the operation of the mixed fishery can be re-purposed to serve as ranges for ecosystem status, with fishing being near the top of the ranges if conditions are forecast to be favorable, and near the bottom if not
The approach as formulated in the second (Irish Sea) study makes three related assumptions that are unlikely to be true in practice, namely (i) that the ecosystem model [in this case Ecopath (Bentley et al, 2019), though it would apply to any other model] correctly determines the true status of the ecosystem, or at the very least its failure to do so is not reinforced by interaction with the single species models so it becomes material, (ii) that fishing rates are directly translatable between different models, and (iii) that the pre-calculated single-species
Summary
Legislation mandates a holistic approach, and many countries have formally committed to Ecosystem-Based Fisheries Management (EBFM), progress toward this has been slow. Combining Ecosystem and Single-Species Modeling to Provide Ecosystem-Based Fisheries Management Advice Within Current Management Systems by Howell, D., Schueller, A.
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