A recent study published in the journal Animal Behaviour suggests that some shark species, such as bull sharks, are not the solitary and aggressive predators often portrayed in movies. The research reveals that these sharks exhibit social behaviors, form friendships, and have complex social lives.
The study, led by Natasha Marosi, a PhD student in animal behavior at the University of Exeter in the U.K., and founder of Fiji Shark Lab, was conducted over six years at the Shark Marine Reserve in Fiji. It involved observing 184 bull sharks during 473 dives, totaling 8,192 minutes of underwater observations.
The researchers discovered that the bull sharks displayed social interactions, including “parallel swims” and “lead-follow” behaviors. They also found that the sharks preferred to associate with individuals of similar sizes and showed a tendency to align their movements in synchronization.
Interestingly, the study revealed that adult sharks formed the core of the social network, with older sharks being less social compared to younger individuals. According to Toby Daly-Engel, director of the shark conservation lab at the Florida Institute of Technology, younger sharks may socialize to acquire essential survival information, while older sharks, having more experience and size, may not need to form social groups for protection.
Despite the study taking place at a provision site where sharks were regularly fed, Marosi emphasized that the observed behaviors were natural and not influenced by the feeding. The findings were supported by previous studies using methods like acoustic and satellite tracking, indicating the consistency of the results.
Understanding shark social interactions could provide insights into various aspects of their behavior, such as learning, mating, and hunting cooperation. Moreover, it could help in addressing conservation challenges faced by sharks due to human activities like overfishing and pollution.
The research not only sheds light on the social nature of sharks but also aims to change perceptions about these creatures from being seen as mindless predators to social animals with their own form of companionship.