The Leschenault Estuary was divided into four regions; the apex, upper, middle and lower regions. Within each region four sites were sampled seasonally (except the middle region where there were four additional crab potting sites) over two years (total of 8 sampling occasions). At each site, sampling of fish was conducted using seine nets with length and weight of all collected fish measured. In addition, water temperature, salinity, dissolved oxygen were measured at each site. The aim of the study is to develop cost-effective strategies for monitoring the fish community.