Healthy fish populations are a fundamental element of thriving coastal ecosystems and an integral part of Australian life. There is an expectation that these ecosystems will be biodiverse and productive into the future, serving to underpin a huge variety of cultural, social, recreational and economic activities that depend upon them. Yet the ecosystem services that we derive from fish are threatened by development pressures, which can alter their habitat. Understanding the large-scale impacts this coastal development has on fishes is an urgent and critical knowledge gap. In this talk, we introduce a seascape ecology approach to assessing the multi-stressor impacts of urbanisation on the full life history of coastal fishes. The Fish Seascapes Project contrasts dynamics in two estuaries of SE Australia which differ in the degree to which they have been impacted by urbanisation pressures: Gamay, Botany Bay (highly urbanised) and Jervis Bay (low levels of urbanisation). The project integrates empirical data on fish recruitment, occupancy, and connectivity using a variety of methods addressing different life stages: traditional capture surveys, underwater video, and acoustic telemetry. We provide an overview of the modelling framework and discuss key initial findings regarding patterns of recruitment and occupancy relative to the seascape mosaic.