Tag Archives: fisheries management

Novel gear combinations for meeting the assumptions of occupancy models in marine systems.

Our new paper demonstrates how applying novel sampling gear combinations can provide statistical replication that is necessary for fitting a class of hierarchical models of occurrence and abundance that use detection/non-detection data. We apply this method to marine reef fish … Continue reading

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Estimating the uncertainty in exploitation rates using parametric bootstrapping

Recently I taught a class on estimating fisheries exploitation rates with tagging studies.  A common study design to estimate exploitation rates is to release tagged fish into the system and allow anglers to return the tags when they harvest a … Continue reading

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Using movement information to approximate population closure for mark-recapture sampling designs:

Abundance of animals in an area (i.e. density) is one of the most basic population parameters desired in applied ecology. Many methods have been developed to estimate abundance within an area such as mark-recapture; however, it is often unclear the … Continue reading

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Under what conditions do we expect spawning-season closures to be effective at protecting largemouth and smallmouth bass stocks?

Black basses such as largemouth bass and smallmouth bass support popular recreational fisheries across North America.  In addition to length limits and bag limits, bass stocks are often managed with seasonal closures during spawning, particularly in their northern regions.  Spawning … Continue reading

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Is there an easy method to reduce bias in fish growth parameter estimates resulting from size-selective sampling?

Describing the growth of fish is important for population modeling, particularly when evaluating policy options for fisheries management.  The most common way to describe the growth of fish is with a von Bertalanffy growth curve, but estimates of growth parameters … Continue reading

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Rethinking length-based fisheries regulations: the value of protecting old and large fish

Recently I coauthored a paper in the journal Fish and Fisheries comparing the relative performance of harvest slots verses minimum-length limits as policies for regulating recreational fisheries.  The paper is in response to the paucity of evaluations of harvest-slot regulations … Continue reading

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Approximating 80% statistical power with management triggers

Recently I have been involved with the evaluation of two monitoring program designs where the objective of the program is to detect when a metric has crossed a specific threshold that is used to trigger management.  For these programs the … Continue reading

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