The redistribution of fish in the ocean has emerged as one of the most significant biological impacts of anthropogenic climate change on the marine environment. These 'range shifts' are already affecting the structure and function of established ecosystems and fisheries, with further changes likely as ocean warming continues. This research is addressing how and why different marine fishes shift their distributions in response to climate change, and what the ecological impacts are. Two iconic species, the yellowtail kingfish Seriola lalandi and the pink snapper Chrysophrys auratus, are being studied within the context of a prominent marine warming hotspot that is located off south-east Australia, where ocean warming is occurring at a rate approximately four times the global average. Both of these species from south-east Australia are thought to be extending their ranges poleward and are likely becoming important components of Tasmanian marine ecosystems. This study aims to: 1) quantify changes in the distributions of yellowtail kingfish and pink snapper from south-east Australia, 2) assess the connectivity of fish found in Tasmania with populations from south-east Australia, 3) compare the condition of fish found in Tasmania with those from populations from lower latitudes, and 4) assess the trophic interactions of these species within Tasmanian ecosystems through stomach content analyses. Data to achieve aim 1 will be extracted from the full complement of available sources, including Reef Life Survey, Atlas of Living Australia, Redmap, recreational game fish tagging surveys and commercial fisheries catch records, and analysed from 1970 - present to align with confidence surrounding 'virtually certain' ocean warming having occurred. Information for aims 2, 3 and 4 will be gathered through a combination of field sampling and fish frames donated by recreational and commercial fishers. This research will provide an understanding of the ecology underpinning range shifts in marine fishes, which is necessary to understand how climate change is presently impacting the marine environment.