DOI: 10.5061/dryad.h7g27vc
title: Data from: Optimized fishing through periodically harvested closures

description: 1. Periodically harvested closures are a widespread, centuries-old form of
 fisheries management that protects fish between pulse harvests and can
 generate high harvest efficiency by reducing fish wariness of fishing
 gear. However, the ability for periodic closures to also support high
 fisheries yields and healthy marine ecosystems is uncertain, despite
 increased promotion of periodic closures for managing fisheries and
 conserving ecosystems in the Indo-Pacific. 2. We developed a bioeconomic
 fisheries model that considers changes in fish wariness, based on
 empirical field research, and quantified the extent to which periodic
 closures can simultaneously maximize harvest efficiency, fisheries yield,
 and conservation of fish stocks. 3. We found that periodic closures with a
 harvest schedule represented by closure for one to a few years between a
 single pulse harvest event can generate equivalent fisheries yield and
 stock abundance levels and greater harvest efficiency than achievable
 under conventional fisheries management with or without a permanent
 closure. 4. Optimality of periodic closures at maximizing the triple
 objective of high harvest efficiency, high fisheries yield, and high stock
 abundance was robust to fish life history traits and to all but extreme
 levels of overfishing. With moderate overfishing, there emerged a
 trade-off between periodic closures that maximized harvest efficiency and
 no-take permanent closures that maximized yield; however, the gain in
 harvest efficiency outweighed the loss in yield for periodic closures when
 compared with permanent closures. Only with extreme overfishing, where
 fishing under nonspatial management would reduce the stock to ≤ 18% of its
 unfished level, was the harvest efficiency benefit too small for periodic
 closures to best meet the triple objective compared with permanent
 closures. 5. Synthesis and applications. We show that periodically
 harvested closures can, in most cases, simultaneously maximize harvest
 efficiency, fisheries yield, and fish stock conservation beyond that
 achievable by no-take permanent closures or non-spatial management. Our
 results also provide design guidance, indicating that short closure
 periods between pulse harvest events are most appropriate for well-managed
 fisheries or areas with large periodic closures, whereas longer closure
 periods are more appropriate for small periodic closure areas and
 overfished systems.
description: READMEPeriodic closure
 bioeconomic modelThis zip file contains
 Matlab code for running bioeconomic fisheries models of periodically
 harvested closures. Use the file "Main_Script.m" to set initial
 parameter values and run the models. The file "Fishery_eval.m"
 contains the population model for each management scenario (i.e.
 non-spatial management, no-take closure, and periodically harvested
 closures). Other code files in this folder include: dispersal kernal (fish
 movement between patches), logistic growth function, optimization
 functions, and functions for saving model data.Model
 Code.zipLoad and
 Plot"Load and
 Plot" contains Matlab code for loading model data, plotting figures,
 and an excel file with periodic closure sizes.bioeconomic_model_dataModel data for all bioeconomic model scenarios. File names include the level of fish movement between patches (S), size of the closure (c), level of overfishing (of) and the fish population growth rate (r) for the particular simulation.https://github.com/kakearney/boundedline-pkg/blob/master/boundedline/boundedline.mCode for plotting bounded shaded lines.