WETHERALL: ANALYSIS OF DOUBLE-TAGGING EXPERIMENTS 



accuracy, and without resort to the usual concur- 

 rent single-tagging experiment. The model was 

 developed in the simple context of a fixed Type II 

 shedding rate, but the principle applies to more 

 complicated shedding processes as well. If the 

 burden imposed by the second tag can be ne- 

 glected, it therefore seems advantageous to dou- 

 ble-tag all fish. In any case, when shedding is ap- 

 preciable the greater overall recovery rates from 

 double-tagging make the exclusive use of double- 

 tagged fish a proposition well worth considering. 



LITERATURE CITED 



Arnason, A. N., and K. H. Mills. 



1981. Bias and loss of precision due to tag loss in Jolly- 

 Seber estimates for mark-recapture experiments. 

 Can. J. Fish. Aquat. Sci. 38:1077-1095. 

 Baglin. R. E., Jr., M. I. Farber, W. H. Lenarz, and J. M. 

 Mason, Jr. 

 1980. Shedding rates of plastic and metal dart tags from 

 Atlantic bluefin tuna, Thunnus thynnus. Fish. Bull., 

 U.S. 78:179-185. 

 Bartholomew, D. J. 



1973. Stochastic models for social processes. John 

 Wiley & Sons, 411 p. 

 Bayliff, W. H. 



1973. Materials and methods for tagging purse seine- 

 and baitboat-caught tunas. [In Engl, and Span.] 

 Inter-Am. Trop. Tuna Comm. Bull. 15:465-503. 

 Bayliff, W. H., and L. M. Mobrand. 



1972. Estimates of the rates of shedding of dart tags from 

 yellowfin tuna. [In Engl, and Span.] Inter-Am. Trop. 

 Tuna Comm. Bull. 15:439-462. 

 Beverton, R. J. H., and S. J. Holt. 



1957. On the dynamics of exploited fish populations. 

 Fish. Invest. Minist. Mar. Fish. Minist. Agric, Fish. 

 Food. (G.B.), Ser. II, 19, 533 p. 

 Chapman, D. G. 



1961. Statistical problems in dynamics of exploited fish- 

 eries populations. Proc. Berkeley Symp. Math. Stat. 

 Probab. 4:153-168. 

 1969. Statistical problems in the optimum utilization of 

 fisheries resources. Bull. Int. Stat. Inst. 42:268-293. 

 Chapman, D. G., B. D. Fink, and E. B. Bennett. 



1965. A method for estimating the rate of shedding of 

 tags from yellowfin tuna. [In Engl, and Span.] Inter- 

 Am. Trop. Tuna Comm. Bull. 10:333-352. 

 Cormack, R. M. 



1968. The statistics of capture-recapture methods. In 

 H. Barnes (editor). Oceanography marine biology annual 

 review 6:455-506. George Allen and Unwin, Ltd., 

 Lond. 



GlJLLAND, J. A. 



1955. On the estimation of population parameters from 



marked members. Biometrika 42:269-270. 

 1963. On the analysis of double-tagging experiments. 

 Int. Comm. Northwest Atl. Fish. Spec. Publ. 4:228- 

 229. 

 Hynd, J. S. 



1969. New evidence on southern bluefin stocks and mi- 

 grations. Aust. Fish. 28(5):26-30. 

 Jennrich, R. I., and R. H. Moore. 



1975. Maximum likelihood estimation by means of non- 

 linear least squares. Am. Stat. Assoc. Proc. Stat. Corn- 

 put. Sect., p. 57-65. 



Jennrich, R. I., and M. L. Ralston. 



1978. Fitting nonlinear models to data. Health Sci. 

 Comput. Facil., Univ. Calif., Los Angeles, BMDP Tech. 

 Rep. 46, 71 p. 

 Kirkwood, G. P. 



1981. Generalized models for the estimation of rates of 

 tag shedding by southern bluefin tuna (Thunnus mac- 

 coyii). J. Cons. Cons. Inst. Explor. Mer 39:256-260. 

 Laurs, R. M., W. H. Lenarz, and R. N. Nishimoto. 



1976. Estimates of rates of tag shedding by North Pacific 

 albacore, Thunnus alalunga. Fish. Bull., U.S. 74:675- 

 678. 



McNolty, F., J. Doyle, and E. Hansen. 



1980. Properties of the mixed exponential failure process. 

 Technometrics 22:555-565. 



Myhre, R. J. 



1966. Loss of tags from Pacific halibut as determined by 

 double-tag experiments. Int. Pac. Halibut Comm. Rep. 

 41, 31 p. 

 Paulik, G. J. 



1963. Estimates of mortality rates from tag recoveries. 

 Biometrics 19:28-57. 

 RlCKER, W. E. 



1975. Computation and interpretation of biological sta- 

 tistics of fish populations. Fish. Res. Board Can. Bull. 

 191. 382 p. 

 Robson, D. S., and H. A. Regier. 



1966. Estimates of tag loss from recoveries of fish tagged 

 and permanently marked. Trans. Am. Fish. Soc. 95: 

 56-59. 

 Seber, G. A. F. 



1973. The estimation of animal abundance and related 

 parameters. Hafner Press, N.Y., 506 p. 



Seber, G. A. F.. and R. Felton. 



1981. Tag loss and the Petersen mark-recapture experi- 

 ment. Biometrika 68:211-219. 



Wedderburn, R. W. M. 



1974. Quasi-likelihood functions, generalized linear 

 models, and the Gauss-Newton method. Biometrika 

 61:439-447. 



Wetherall, J. A., and M. Y. Y. Yong. 



1981. Planning double-tagging experiments. U.S. Dep. 

 Commer., NOAA Tech. Memo. NMFS-SWFC-13, 44 p. 



701 



