Study Finds Drones Do Not Alter Whale Shark Behavior

A study has examined whether drones affect the behavior of whale sharks, the world's largest fish species. Researchers attached motion-sensing tags to 13 whale sharks to record fine-scale data including swimming effort, tail beat frequency and diving behavior.

Drones were flown overhead at heights from 33 to 197 feet while baseline data was collected when no drone was present. The whale sharks showed no measurable change in swimming patterns or signs of agitation or avoidance when drones were overhead. The data indicated the animals behaved as though the drones were not present.

Previous studies on other marine species such as dolphins and seabirds had documented behavioral reactions to drones detected through observation. The researchers used the tags to capture subtle movements that might indicate stress even if not visible from above.

This approach was intended to reduce subjectivity associated with visual observation alone. A spokesperson for the research team stated that although no effects were detected on whale sharks, physiological changes or impacts during other behaviors such as feeding were not measured.

The work was conducted at a site known for attracting researchers and tourists to observe whale sharks. Drones have become a common tool in marine research because they provide overhead views without the noise or physical presence of boats or divers.

Scientists use them to gather improved data on population sizes, movement patterns and body condition. The findings apply specifically to whale sharks and may not extend to other species sharing the same waters. A tool that shows minimal impact on one species could still disturb others.

The study also noted that whale sharks might respond differently during feeding, social interactions or prolonged drone exposure.

Flights in the study were carried out under a special permit. Regulations in Western Australia include safeguards to protect animals during drone use in research. The results provide information for scientists considering drone deployment for whale shark studies.

A spokesperson for the research team said the findings support a precautionary approach of flying drones as high and as briefly as possible and only when they add clear value to the research. The study forms part of ongoing examination of how new technologies influence the wildlife they are used to observe.

Drones can reduce the need for close human interaction, lower costs and expand the scale of wildlife research. At the same time each new tool introduced into the marine environment becomes part of that environment. The research underscores the importance of continued evaluation of ecological impacts as technology advances.