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A hierarchical model to estimate the abundance and biomass of salmonids by using removal sampling and biometric data from multiple locations

Ruiz, Philippe and Laplanche, Christophe A hierarchical model to estimate the abundance and biomass of salmonids by using removal sampling and biometric data from multiple locations. (2010) Canadian Journal of Fisheries and Aquatic Sciences (CJFAS), vol. 67 (n° 12). pp. 2032-2044. ISSN 1205-7533

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Official URL: http://dx.doi.org/10.1139/F10-123

Abstract

We present a Bayesian hierarchical model to estimate the abundance and the biomass of brown trout (Salmo trutta fario) by using removal sampling and biometric data collected at several stream sections. The model accounts for (i) variability of the abundance with fish length (as a distribution mixture), (ii) spatial variability of the abundance, (iii) variability of the catchability with fish length (as a logit regression model), (iv) spatial variability of the catchability, and (v) residual variability of the catchability with fish. Model measured variables are the areas of the stream sections as well as the length and the weight of the caught fish. We first test the model by using a simulated dataset before using a 3-location, 2-removal sampling dataset collected in the field. Fifteen model alternatives are compared with an index of complexity and fit by using the field dataset. The selected model accounts for variability of the abundance with fish length and stream section and variability of the catchability with fish length. By using the selected model, 95% credible interval estimates of the abundances at the three stream sections are (0.46,0.59), (0.90,1.07), and (0.56,0.69) fish/m2. Respective biomass estimates are (9.68, 13.58), (17.22, 22.71), and (12.69, 17.31) g/m2.

Item Type:Article
Additional Information:Thanks to NRC Research Press editor. The definitive version is available at http://www.nrcresearchpress.com/doi/abs/10.1139/F10-123#.UThb9zdTCGc
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Nadia Kelmouss
Deposited On:14 May 2012 08:16

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