Leatherback Turtle: Where and when to dive with them

Encountering a Leatherback Turtle underwater is an incredibly rare privilege for divers due to their pelagic nature and deep-diving habits. Should you be so fortunate, maintain a respectful distance of at least 10-15 feet (3-5 meters) to avoid disturbing these magnificent creatures. Never attempt to touch, ride, or chase the turtle. Sudden movements or close approaches can cause stress and may disorient them. Observe their natural behavior without interference. Focus on keeping your movements slow and calm. While Leatherbacks are large and powerful, they are generally not aggressive unless provoked or cornered. Their immense size, distinctive seven dorsal ridges on their leathery carapace, and lack of scales make them easily identifiable. They are often dark grey or black with white or pale spots. Photographing is acceptable, but avoid flash photography, especially at night or in low light, as this can startle them. Be mindful of their conservation status; Leatherbacks are critically endangered globally, so reporting sightings to local marine authorities or conservation groups can aid research. Remember that legal protections are in place; disturbing or harassing marine turtles carries significant penalties. Always prioritize the animal's welfare and adhere to local regulations regarding marine wildlife encounters. If you spot marine debris, especially plastic bags, that could be mistaken for jellyfish, safely collect it if possible and if it doesn't disturb the turtle or put you at risk. Responsible diving practices are paramount to ensuring these ancient mariners continue to roam the oceans.

Observing Leatherback Turtles alive in their natural habitat is a rare and special event for divers, as they are primarily pelagic and often far offshore. However, opportunities increase during their nesting season or in areas known for significant foraging. In the Caribbean, particularly around Trinidad and Tobago, nesting generally occurs from March to July, with peaks in April and May. Similarly, in Costa Rica, nesting activity at places like Parque Nacional Marino Las Baulas typically runs from October to March, with loggerheads overlapping. While direct underwater encounters during nesting are extremely uncommon and generally prohibited to avoid disturbance, divers in nearby waters might have a fleeting chance encounter if a turtle is traveling to or from a nesting beach. For opportunities to see them foraging, more temperate waters, particularly around Canada's east coast (e.g., Nova Scotia) or in the Eastern Pacific off California, may offer sightings from late spring through fall (May to October) when jellyfish blooms are abundant, though these are typically surface observations from boats rather than underwater encounters.

The Leatherback Turtle, *Dermochelys coriacea*, is the largest living sea turtle and the most migratory, ranging across the world's oceans from tropical to subpolar waters. Unlike other sea turtles, they lack a hard, bony shell, possessing a leathery carapace supported by a mosaic of bones. This unique adaptation allows them to tolerate colder waters. They are primarily pelagic, spending most of their lives in the open ocean, though females return to sandy tropical and subtropical beaches to nest. Major nesting sites include Trinidad and Tobago, Costa Rica (e.g., Parque Nacional Marino Las Baulas), French Guiana, and parts of Indonesia. During foraging migrations, they can be found in nutrient-rich temperate and boreal waters, traveling thousands of miles. Divers in locations like Galapagos might encounter them offshore during their migratory patterns, while specific nesting beaches offer rare opportunities to observe them from a distance during nesting season.

Leatherback Turtles are specialized predators with a diet almost exclusively composed of soft-bodied invertebrates, primarily jellyfish and tunicates. Their unique, scissor-like jaws, lined with backward-pointing spines, are perfectly adapted to grasp and swallow these slippery prey items without them escaping. They are highly efficient hunters, capable of consuming vast quantities of jellyfish, which are often scarce in nutrients, requiring them to eat large volumes to sustain their massive bodies. They actively pursue their prey in the water column, often diving to considerable depths to forage. Their diet makes them particularly vulnerable to plastic pollution, as plastic bags floating in the ocean are easily mistaken for jellyfish, leading to fatal ingestion and internal blockages. This dietary specialization highlights their crucial role as gelatinous plankton regulators in the marine ecosystem.