Glassfish

Photo: sharkdevotee · CC BY-NC

Dense baitfish clouds pack the interior of La Catedral's tunnel, exploiting the darkness and structural complexity to shelter from predators active in the open water outside. Their near-transparent bodies with a visible lateral line and internal organs make them difficult for visually hunting predators to track individually, a schooling adaptation known as confusion effect. The aggregations pulse and contract around divers passing through the tunnel, creating one of the most visually dramatic encounters in Canarian diving.