Summary (tl;dr)

Scientists in Western Australia have used environmental DNA (eDNA) to detect the presence of a giant squid off the Ningaloo Coast for the first time in over 25 years, alongside hundreds of other deep-sea species.

Essential Background

Giant squids are extremely elusive deep-sea creatures, rarely observed in their natural habitat, making their study challenging for decades. Prior to this discovery, there had only been two historical records of giant squids in Western Australian waters, with no confirmed sightings or specimens for more than a quarter of a century. The recent breakthrough was made possible by environmental DNA (eDNA) technology, which allows scientists to detect genetic material shed by organisms into the surrounding water (such as through skin, mucus, or waste) without needing to directly see or capture the animals.

The Full Story

Researchers from Curtin University and the University of Western Australia, in collaboration with the Western Australian Museum, embarked on an expedition aboard the Schmidt Ocean Institute's research vessel Falkor. They collected over 1,000 water samples from the Cape Range and Cloates submarine canyons, deep-sea environments plunging to depths exceeding 4,500 meters off the Nyinggulu (Ningaloo) Coast. The analysis of these eDNA samples revealed the presence of the giant squid (Architeuthis dux), marking the first time the species has been detected off Western Australia's coast using eDNA protocols and the northernmost record in the eastern Indian Ocean. Beyond the giant squid, the study also identified 226 species across 11 major animal groups, including pygmy sperm whales, Cuvier's beaked whales, sleeper sharks, and faceless cusk eels, with many previously unrecorded in the region or potentially new to science. The findings were published in the journal Environmental DNA.

Why It Matters

This groundbreaking research highlights the immense, largely unexplored biodiversity of deep-sea ecosystems, which face growing pressures from climate change, fishing, and resource extraction. The use of eDNA proves to be a transformative and essential tool for deep-sea exploration and conservation, offering a comprehensive understanding of marine life that traditional methods often miss due to the challenges of extreme depths. By identifying species present in these remote areas, scientists can better advocate for their protection and inform conservation strategies, underscoring the importance of protecting what is still unknown.

Geographic Location

• Nyinggulu (Ningaloo) Coast, Western Australia, Australia (giant squid and other marine species detected via eDNA in deep-sea canyons)
• Cape Range Canyon, Western Australia, Australia (eDNA samples collected)
• Cloates Canyon, Western Australia, Australia (eDNA samples collected)