creators_name: Ihde, TF creators_name: Hoenig, JM creators_name: Frusher, SD creators_id: creators_id: creators_id: stewart.frusher@utas.edu.au type: article datestamp: 2008-05-28 12:46:07 lastmod: 2008-07-18 10:59:11 metadata_visibility: show title: Evaluation of a multi-year index-removal abundance estimator, with application to a Tasmanian rock lobster fishery ispublished: pub subjects: 270000 full_text_status: restricted keywords: Abundance estimation; Catchability coefficient; Exploitation rate; Jasus edwardsii; Southern rock lobster note: The definitive version is available online at http://www.sciencedirect.com/ abstract: The index-removal (IR) method provides estimates of abundance, exploitation rate and survey catchability based on the change in catch rate between pre- and post-harvest surveys. However, model estimates often demonstrate poor precision. A multiple-year IR model (1qIR) was developed to improve the precision of model estimates. Both the multiple-year and single-year models were applied to simulated data to compare model performance over a range of exploitation rates, and to test 1qIR model robustness to failure of the assumption of constant catchability over all years. Both models were then applied to data from a southern rock lobster fishery in Tasmania, Australia. The 1qIR model consistently outperformed the single-year model in all chosen performance criteria using simulated data and data from the rock lobster fishery. The performance of the 1qIR model continued to improve as additional years were added to the dataset. When the survey catchability coefficient varied in 1 of 5 years, the 1qIR model was robust to failure of the assumption of constant catchability among years until a 50% change in catchabilities occurred. When applied to rock lobster fishery data, 1qIR estimates were less variable than single-year model estimates and provided reasonable estimates of population abundance, survey catchability coefficient, and exploitation rate. Diagnostic tests to evaluate model estimates of exploitation rate were described and applied to model estimates for parameters of the rock lobster fishery. The 1qIR model estimates performed well in diagnostic plots, but results for the single-year model were poor. The 1qIR model offers a useful method to estimate abundance and exploitation rate in situations when estimates from the single-year model prove too variable to be useful. date: 2008-01 date_type: published publication: Fisheries Research volume: 89 number: 1 pagerange: 26-36 id_number: 10.1016/j.fishres.2007.08.009 refereed: TRUE issn: 0165-7836 official_url: http://dx.doi.org/10.1016/j.fishres.2007.08.009 referencetext: 1. Brownie, C., Anderson, D.R., Burnham, K.P., Robson, D.S. (1985) Statistical Inference from Band Recovery Data-A Handbook. Cited 184 times. U.S. Department of the Interior, Fish and Wildlife Service, Resource Publication 156, Washington, DC 2. Chen, C.-L., Pollock, K.H., Hoenig, J.M. Combining change-in-ratio, index-removal, and removal models for estimating population size (1998) Biometrics, 54 (3), pp. 815-827. Cited 5 times. doi: 10.2307/2533836 3. Chen, C.-L., Hoenig, J.M., Dawe, E.G., Brownie, C., Pollock, K.H. New developments in change-in-ratio and index-removal methods, with application to snow crab (Chionoecetes opilio) (1998) Can. Spec. Publ. Fish. Aquat. Sci., pp. 49-61. Cited 9 times. Proceedings of the North Pacific Symposium on Invertebrate Stock Assessment and Management, vol. 125. Jamieson G.S., and Campbell A. (Eds) 4. Dawe, E.G., Hoenig, J.M., Xucai Xu Change-in-ratio and index-removal methods for population assessment and their application to snow crab (Chionoecetes opilio) (1993) Canadian Journal of Fisheries & Aquatic Sciences, 50 (7), pp. 1467-1476. Cited 9 times. 5. Eberhardt, L.L. Calibrating an index using removal data (1982) J. Wildl. Manage., 46, pp. 734-740. Cited 9 times. 6. Frusher, S. Stock assessment report (1997) Rock Lobster Marine Resources Division, Department of Primary Industry and Fisheries 35 7. Frusher, S.D., Hoenig, J.M. Recent developments in estimating fishing and natural mortality and tag reporting rate of lobsters using multi-year tagging models (2003) Fisheries Research, 65 (1-3), pp. 379-390. Cited 5 times. doi: 10.1016/j.fishres.2003.09.027 8. Frusher, S.D., Kennedy, R.B., Gibson, I.D. Preliminary estimates of exploitation rates in the Tasmanian rock lobster (Jasus edwardsii) fishery using the change-in-ratio and index-removal techniques with tag-recapture data (1998) Can. Spec. Publ. Fish. Aquat. Sci., pp. 63-71. Cited 10 times. Proceedings of the North Pacific Symposium on Invertebrate Stock assessment and Management, vol. 125. Jamieson J.G., and Campbell A. (Eds) 9. Frusher, S.D., Gardner, C., Mackinnon, C., Haddon, M. (2003) Tasmanian Rock Lobster Fishery 2001/2002 Tasmanian Aquaculture and Fisheries Institute 10. Gedamke, T., DuPaul, W.D., Hoenig, J.M. Index-removal estimates of dredge efficiency for sea scallops on Georges Bank (2005) North American Journal of Fisheries Management, 25 (3), pp. 1122-1129. doi: 10.1577/M04-111.1 11. Hoenig, J.M., Pollock, K.H. Index-removal methods (1998) Encyclopedia of Statistical Sciences Update, 2, pp. 342-346. Cited 4 times. Kotz S., Read C.B., and Banks D.L. (Eds), John Wiley & Sons, Inc., New York 12. Reference information not available. 13. Reference information not available. 14. Ihde, T.F., Frusher, S.D., Hoenig, J.M. Do large rock lobsters inhibit smaller ones from entering traps? A field experiment (2006) Marine and Freshwater Research, 57 (7), pp. 665-674. Cited 2 times. doi: 10.1071/MF05238 15. (2000) S-Plus Professional Release 3, Professional Edition for Windows MathSoft, MathSoft, Inc., Seattle, WA 16. Petrides, G.A. Viewpoints on the analysis of open season sex and age ratios (1949) Trans. N. Am. Wildl. Conf., 14, pp. 391-410. Cited 7 times. 17. Punt, A.E., Kennedy, R.B. Population modelling of Tasmanian rock lobster, Jasus edwardsii, resources (1997) Marine and Freshwater Research, 48 (8), pp. 967-980. Cited 45 times. 18. Roseberry, J.L., Woolf, A. A comparative evaluation of techniques for analyzing white-tailed deer harvest data (1991) Wildlife Monographs, 117, pp. 59. Cited 38 times. 19. Routledge, R.D. The removal method for estimating natural populations: Incorporating auxiliary information (1989) Biometrics, 45 (1), pp. 111-121. Cited 8 times. 20. Zar, J.H. (1996) Biostatistical Analysis. third ed.. Cited 26429 times. Prentice-Hall, Upper Saddle River, NJ 21. Ziegler, P.E., Frusher, S.D., Johnson, C.R. Space - Time variation in catchability of southern rock lobster Jasus edwardsii in Tasmania explained by environmental, physiological and density-dependent processes (2003) Fisheries Research, 61 (1-3), pp. 107-123. Cited 4 times. doi: 10.1016/S0165-7836(02)00240-0 22. Ziegler, P.E., Frusher, S.D., Johnson, C.R., Gardner, C. Catchability of the southern rock lobster Jasus edwardsii. I. Effects of sex, season and catch history (2002) Marine and Freshwater Research, 53 (8), pp. 1143-1148. Cited 9 times. doi: 10.1071/MF01243 citation: Ihde, TF and Hoenig, JM and Frusher, SD (2008) Evaluation of a multi-year index-removal abundance estimator, with application to a Tasmanian rock lobster fishery. Fisheries Research, 89 (1). pp. 26-36. ISSN 0165-7836 document_url: http://eprints.utas.edu.au/6502/1/Ihde_et_al_2008.pdf