10.5061/DRYAD.H7G27VC
Carvalho, Paul G.
University of Rhode Island
Jupiter, Stacy D.
Wildlife Conservation Society Melanesia Program Suva Fiji
Januchowski-Hartley, Fraser A.
Marine Biodiversity Exploitation and Conservation
Goetze, Jordan
Curtin University
Claudet, Joachim
École Pratique des Hautes Études
Weeks, Rebecca
James Cook University
Humphries, Austin
University of Rhode Island
White, Crow
California Polytechnic State University
Data from: Optimized fishing through periodically harvested closures
Dryad
dataset
2019
Marine reserves
Marine protected areas
Fish behavior
Bioeconomic model
Periodically harvested closures
2019-06-06T18:27:11Z
2019-06-06T18:27:11Z
en
https://doi.org/10.1111/1365-2664.13417
https://github.com/kakearney/boundedline-pkg/blob/master/boundedline/boundedline.m
1008834573 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
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.