Using R for Modelling and Quantitative Methods in Fisheries has evolved and been adapted from an earlier book by the same author and provides a detailed introduction to analytical methods commonly used by fishery scientists ecologists and advanced students using the open-source software R as a programming tool. Some knowledge of R is assumed as this is a book about using R but an introduction to the development and working of functions and how one can explore the contents of R functions and packages is provided. The example analyses proceed step-by-step using code listed in the book and from the book’s companion R package MQMF available from GitHub and the standard archive CRAN. The examples are designed to be simple to modify so the reader can quickly adapt the methods described to use with their own data. A primary aim of the book is to be a useful resource to natural resource practitioners and students. Featured Chapters: Model Parameter Estimation provides a detailed explanation of the requirements and steps involved in fitting models to data using R and mainly maximum likelihood methods. On Uncertainty uses R to implement bootstrapping likelihood profiles asymptotic errors and Bayesian posteriors to characterize any uncertainty in an analysis. The use of the Monte Carlo Markov Chain methodology is examined in some detail. Surplus Production Models applies all the methods examined in the earlier parts of the book to conducting a stock assessment. This included fitting alternative models to the available data characterizing the uncertainty in different ways and projecting the optimum models forward in time as the basis for providing useful management advice.