How useful is the ratio of fish density outside versus inside no-take marine reserves as a metric for fishery management control rules?

A management strategy evaluation (based on five species in the California, USA, nearshore fishery) of control rules that reduce relative fishing effort as a function of the ratio of fish density outside versus inside no-take marine reserves (as a measure of depletion) showed that although the contro...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2011-02, Vol.68 (2), p.343-359
Main Authors: Babcock, Elizabeth A, MacCall, Alec D
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Analysis
Animal reproduction
Animal, plant and microbial ecology
Applied ecology
Aquatic sciences
Biological and medical sciences
Density dependence
Environmental changes
Environmental conditions
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fish
Fish populations
Fisheries
Fisheries management
Fishery management
Fundamental and applied biological sciences. Psychology
Illegal fishing
Management
Marine
Marine parks and reserves
Scorpaenichthys marmoratus
Sebastes carnatus
Sebastes melanops
Sebastes miniatus
Sebastes mystinus
Simulation
Spawning
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
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Summary:A management strategy evaluation (based on five species in the California, USA, nearshore fishery) of control rules that reduce relative fishing effort as a function of the ratio of fish density outside versus inside no-take marine reserves (as a measure of depletion) showed that although the control rules allowed effort to increase at first, in the long term, they were effective at maintaining spawning stock biomass and yield for all simulated species, including depleted ones. Scenarios with fish movement, illegal fishing in the reserve, or post-dispersal density dependence in recruitment required higher density ratio targets, such as 60% of mature fish or 80% of all fish, to avoid stock depletion. The effort allowed by multispecies density-ratio control rules depended on the relative weight given to more or less depleted species. High variability in recruitment or in monitoring data caused the allowable effort to fluctuate. Density-ratio control rules have the advantages that they require no historical data, they can be used at local spatial scales, and they adjust to changing environmental conditions.
ISSN:0706-652X
1205-7533
DOI:10.1139/F10-146