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Mark-Recapture methodology has been one of the major§experimental methods for gaining information on§wildlife populations over the last 100 years. The§standard methodology for assessing mortality rates in§open populations (the Cormack-Jolly-Seber method and§its expansions) has assumed that the recapture are§done instantaneously, or at least during a very short§interval. This is often not the case as the sampling§is often done during a season or a long term field§trip. This text presents methods for analysing§capture- and mortality rates from mark-recapture data§where the data are not collected instantaneously, but§more or less continously. The metod is based on§semi-parametric models often used in survival§analysis, such as the Kaplan-Meier or Cox models. The§methods are illustrated using real data on fish and§bird poulations.