Nearly all US aquarium fish are sourced directly from the wild

Almost 90 percent of marine aquarium fish sold online in the United States are sourced directly from wild populations, many from coral reefs in the western Pacific and Indian Ocean, raising stark concerns about the ecological footprint of the global ornamental fish trade.

The research, published in Conservation Biology, was led by Dr Bing Lin, a postdoctoral researcher at the University of Sydney’s Thriving Oceans Research Hub. It paints a sobering picture of an industry often shrouded in opacity, yet intimately connected to the world’s most biodiverse – and vulnerable – marine habitats.

Analysing data from four leading US-based online aquarium retailers, the study found that of 734 species available for sale, 655 were sourced exclusively from the wild. Only 21 species were listed as available solely through aquaculture. The US – which imports around two-thirds of all marine aquarium fish globally – plays a central role in driving demand.

“These numbers are likely conservative,” said Dr Lin, who conducted the research as part of his doctoral work at Princeton University. “Our findings suggest that wild capture remains the dominant mode of supply, with minimal transparency for consumers.”

Many of the species traded – including clownfish, wrasses, and gobies – are in fact harvested from tropical coral reefs that are already under pressure from climate change, habitat degradation, and overfishing. Some collection practices (those such as cyanide fishing) continue to be documented in parts of the Indo-Pacific, though sustainable alternatives do exist.

Encouragingly, the study identified that fish raised through aquaculture were, on average, 28 percent less expensive than their wild-caught counterparts—suggesting that sustainable options are not only viable but economically competitive. Despite this, aquacultured species remain a minority in the marketplace.

“Price isn’t the barrier here,” Lin noted. “Instead, it’s a complex mix of consumer preference, breeding challenges, and the lack of supply chain transparency that keeps demand for wild-caught fish high.”