The migrate package implementions of a catch conditioned modification of Hilborn (1990) to estimate the rates of migration between two areas from tag releases and recaptures, catches, tag-loss, tag-induced mortality, natural mortality and the ratio of population size in each area.
Hilborn, R. 1990. Determination of fish movement patterns from tag recoveries using maximum likelihood estimators. Canadian Journal of Fisheries and Aquatic Sciences, 47, 635-643