Development and application of an agent-based model to evaluate methods for estimating relative abundance indices for shoaling fish such as Pacific rockfish (Sebastes spp.)
Authored by James T. Thorson, Ian J. Stewart, Andre E. Punt
Date Published: 2012-05
DOI: 10.1093/icesjms/fss003
Sponsors:
United States National Oceanic and Atmospheric Administration (NOAA)
Platforms:
No platforms listed
Model Documentation:
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Abstract
Many marine fish, including Pacific rockfish (Sebastes spp.), exhibit habitat-selective and shoaling behaviours, which can lead to imprecision when using survey data to estimate an annual index of stock abundance. We develop a spatial agent-based model (ABM) for Pacific rockfish, which generates data similar to those observed in existing bottom-trawl surveys and can represent various spatial and shoaling behaviours. We use the ABM to evaluate the performance of a model that uses mixture distribution methods to account for fish shoals and delta-methods to account for range expansion or contraction. This delta-mixture model is compared with conventional delta-generalized linear models (delta-GLMs) and a quantile regression delta-model. The delta-mixture increases precision by 15% relative to delta-GLMs in estimated abundance indices when shoaling behaviours are present, whereas precision is similar between delta-GLM and delta-mixture models when shoals are absent. The delta-quantile method has similar improvements over conventional delta-GLM methods, and the improved precision from delta-mixture and delta-quantile methods is decreased but not eliminated by decreased sampling intensities. These simulations represent the first evaluation of delta-mixture models for index standardization and show a substantial improvement over conventional delta-GLMs for shoaling species such as Pacific rockfish.
Tags
Individual-based model
behavior
Performance
bottom-trawl survey
delta-model
extreme catch events
hurdle model
index standardization
mixture distribution
quantile regression
Schools
Distributions
resource
fisheries
Habitats
Collapse
Gadus-morhua
Trawl survey