6533 28 archive 383 disk0/00/00/65/33 2008-05-29 17:37:12 2008-07-18 10:59:40 2008-07-16 17:26:10 article show stewart.frusher@utas.edu.au Frusher SD stewart.frusher@utas.edu.au Hoenig JM pub 300700 630399 public © 2001 NRC Canada Most lobster fisheries are characterized by high exploitation rates. This has led to substantial declines in the size structures of the populations over time as larger lobsters have been removed. Although both scientists and fishers have suggested that size related hierarchies could impact on lobsters entering traps, the effect of the size change on the selectivity of lobster traps as a population's size structure changes has not been investigated. This paper demonstrates that larger lobsters affect the entrapment of smaller lobsters and that this behaviour affects the selectivity of lobster traps. Both spatial and temporal (within season) factors were found to affect the selectivity plots. Spatial differences in selectivity were attributed to the broader size range of larger lobsters found in regions of faster growth. Temporal differences were attributed to the decline in larger lobsters over the course of a season caused by exploitation. There are also differences in trap selectivity between the sexes. 2001-12 published Canadian Journal of Fisheries and Aquatic Sciences 58 12 2482-2489 10.1139/cjfas-58-12-2482 TRUE 0706-652X http://dx.doi.org/10.1139/cjfas-58-12-2482 1. Addison, J.T. Influence of behavioural interactions on lobster distribution and abundance as inferred from pot-caught samples (1995) ICES Mar. Sci. Symp., 199, pp. 294-300. Cited 15 times. 2. Addison, J.T., Lovewell, S.R.J. Size composition and pot selectivity in the lobster (Homarus gammarus (L.)) and crab (Cancer pagurus L.) fisheries on the east coast of England (1991) ICES Journal of Marine Science, 48 (1), pp. 79-90. Cited 5 times. 3. Anganuzzi, A., Hilborn, R., Skalski, J.R. 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Performance and selectivity of trap fisheries for crustaceans (1989) Marine invertebrate fisheries: their assessment and management, pp. 307-325. Cited 30 times. Edited by J.F. Caddy. Wiley, New York 11. Miller, R.J. Saturation of crab traps: Reduced entry and escapement (1979) J. Cons. Int. Explor. Mer., 38, pp. 338-345. Cited 24 times. 12. Miller, R.J. Catchability of American lobsters (Homarus americanus) and rock crabs (Cancer irroratus) by traps (1989) Canadian Journal of Fisheries & Aquatic Sciences, 46 (10), pp. 1652-1657. Cited 15 times. 13. Miller, R.J. Effectiveness of crab and lobster traps (1990) Canadian Journal of Fisheries & Aquatic Sciences, 47 (6), pp. 1228-1251. Cited 107 times. 14. Miller, R.J. Catchability coefficients for American lobster (Homarus americanus) (1995) ICES Mar. Sci. Symp., 199, pp. 349-356. Cited 14 times. 15. Morgan, G.R. Aspects of population dynamics of western rock lobster, Panulirus longipes cygnus George. 2. Seasonal changes in catchability coefficient (1974) Aust. J. Mar. Freshw. Res., 25, pp. 249-259. Cited 26 times. 16. Myers, R.A., Hoenig, J.M. Direct estimates of gear selectivity from multiple tagging experiments (1997) Canadian Journal of Fisheries and Aquatic Sciences, 54 (1), pp. 1-9. Cited 11 times. doi: 10.1139/cjfas-54-1-1 17. Newman, G.G., Pollock, D.E. Growth of the rock lobster Jasus lalandii and its relationship to benthos (1974) Marine Biology, 24 (4), pp. 339-346. Cited 22 times. doi: 10.1007/BF00396100 18. Olsen, A.M. Inferred size hierarchy in J. lalandei (1958) Fish. Newsl. (Australia), APRIL, p. 9. 19. Pearn, R. Rock lobster tagging shows movement occurs (1994) Fishing Today, 7 (5), pp. 27-29. Cited 9 times. 20. Pollock, K.H., Hoenig, J.M. Change-in-ratio estimators (1998) Encyclopedia of statistical sciences update, 2, pp. 109-112. Cited 6 times. Edited by S. Kotz, C.B. Read, and D.L. Banks. John Wiley and Sons, Inc., New York 21. Punt, A.E., Kennedy, R.B., Frusher, S.D. Estimating the size-transition matrix for Tasmanian rock lobster, Jasus edwardsii (1997) Marine and Freshwater Research, 48 (8), pp. 981-992. Cited 21 times. 22. Schrivener, J.C.E. Agonistic behaviour of the American lobster Homarus americanus (Milne-Edwards) (1971) Fish. Res. Board Can. Tech. Rep., p. 235. Cited 13 times. 23. Treble, R.J. (1996) The southern rock lobster (Jasus edwardsii): fisheries biology and abundance estimation. Cited 7 times. Ph.D. dissertation. University of Melbourne, Australia 24. Winstanley, R.H. (1977) Biology of the southern rock lobster. Victorian southern rock lobster fishery seminar 9-10 June 1997, Portland, Victoria. Commercial Fisheries Section, Fisheries and Wildlife Division, Ministry for Conservation, Victoria, Melbourne 5372 8 6533 1 application/pdf en public cc_utas

frusher-hoenig-impact.pdf

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