Sightings of fish outside their usual regions could be a sign of marine species shifting in response to climate change, an Australian study has found.
The study, lead by Hannah Fogarty from the Institute for Marine and Antarctic Studies (IMAS) and the University of Tasmania (UTAS), revealed that initial reports of fish in unaccustomed waters are often a sign of impending species-wide change.
Fogarty compiled a list of verified first sightings from around the world and compared it with long-term data on warming oceans and found a correlation between the early stages of a species range shift and climate change.
"Climate change is leading to global changes in species distribution patterns and the reshuffling of biodiversity is already well underway," Fogarty said in a UTAS media release on Friday.
"In Australia, for example, a Lemonpeel Angelfish was found off Lord Howe Island, more than 1,000 kilometres south of its usual coral reef habitat. Tropical and sub-tropical fish such as this are increasingly being found in temperate waters, with species such as wrasse, parrotfish, flounder and eels well-represented in global reports of unusual sightings."
"New marine species arriving in an area may become pests, modify the local ecosystem, or represent challenges or opportunities for fisheries and recreation."
"It's therefore important to detect the early signs that fish may be moving into a new area, allowing for risks to be assessed and proactive management strategies to be put in place."
Gretta Peel, an Associate Professor at IMAS and co-author on the study, said the research was an impressive achievement for a young scientist.
The study was published in the journal Global Change Biology on Friday.
