In the following you will be guided through an analysis of length-frequency data, resulting in an estimation of the degree of exploitation, and an indication of how much more could be caught with a different fishing strategy. For advanced users we also provide an approach to estimate Linf, Z/K, Z, annual reproductive rate (alpha), intrinsic rate of population increase (rmax), population doubling time (td), and fishing mortality associated with maximum sustainable yield (Fmsy).
We assume that you have a set of length frequency data for this species and that you have a good idea about the maximum length (largest fish caught during the last 5 - 10 years) of your population. Note that this analysis is based on the assumption that the size distribution in your sample is similar to that of the population as a whole (see Note). In every step you can click on the 'Background' button for definitions of parameters and equations.
In the next step you will be asked to enter your Length Frequency data (go to 'Length frequencies', 'L-F Data' if you want to use data from FishBase).