Misión Tiburón

Hammerhead shark, Cocos Island, Costa Rica

The scalloped hammerhead shark (Sphyrna lewini) suffered global population decreases of 95% as a result of horrific “finning” practices, as well as accidental bycatch in long line fishing in pelagic waters.[2] Juveniles, despite having too small fins, are still kept and used as bait for larger sharks.[3] The scalloped hammerhead is one of the sharks most affected by such practises, and according to IUCN Red List is endangered; being a highly migratory species, it is very vulnerable, as conservation efforts have to take place across many nations.[4] In Costa Rica, the traditional dish ceviche incorporates Hammerhead shark meat, contributing to the decline of these vulnerable populations.[5] Following empirical observations in the waters surrounding Cocos Island off the pacific coast of Costa Rica, it was found that populations of adult scalloped hammerhead sharks declined by 45% despite Cocos Island being a protected national park.[6] Misión Tiburón collected scientific data using satellite telemetry and acoustic telemetry shark tagging methods[7] providing evidence, from a high abundance of juveniles, that the coastal waters in Golfo Dulce were critical to the scalloped hammerhead’s survival. Misión Tiburón’s data indicated that whilst adult sharks feed in the rich pelagic waters surrounding Cocos Island, they must migrate over 300 miles – along an underwater mountain range – to reach the mangrove coastal region of Golfo Dulce where females give birth to live young. The pups then remain in the sheltered root system, thriving off rich nutrient waters and benefiting from the protection by avoiding predators.[8] As a result of Misión Tiburón’s work, the coastal regions of Golfo Dulce were assigned as the Scalloped Hammerhead Shark Sanctuary by the government of Costa Rica: this marked the first shark sanctuary in Costa Rica as well as the first shark sanctuary in the world focused on protecting juvenile sharks.[9] The protected area covers over 10,000 acres of habitat in the Golfo Dulce region.[10]

Illena Zanella with a juvenile scalloped hammerhead shark in Golfo Dulce

The whitetip reef shark (Triaenodon obesus) gains its name from the unmissable white tipped dorsal and caudal fins, inhabiting global tropical coastal waters as well as coral reefs. The Whitetip shark populations are threatened by multiple human activities including fishing; in Costa Rica, Misión Tiburón is focusing on conserving these sharks through tagging programs to track their populations, of which little is currently known. The program focuses around Cocos Island National Park and other hot spots off the Pacific Coast of Costa Rica.[11]

The bull shark (Carcharhinus leucas) is a migratory species distributed globally – in mostly warm, shallow waters such as rivers and estuaries, being fresh or salt water. Juvenile sharks require the protection of mangrove coastal regions, such as Potrero Grande Mangrove and Punta Respingue Mangrove in Costa Rica, to thrive. These important habitats and populations lack scientific data, which could aid in the conservation of this species vulnerable to fisheries. Misión Tiburón aims to collect such data using acoustic and satellite tagging programs, utilising their findings to promote conservation of the Bull Sharks by working with local communities and approaching the governmental sector.[12]

Misión Tiburón recognises that conservation involves education, their motto being “conocer para proteger”; as part of their work to conserve the scalloped hammerhead shark, they run educational activities in local coastal communities as well as participatory workshops with local fishermen operating in the Golfo Dulce region. By communicating with such fisheries, they can prevent mortality rates of juvenile hammerhead sharks. “Shark Route” is another scheme that focuses on educating elementary aged students about marine resources and the importance of the sharks’ role in aquatic ecosystems, as well as their vulnerability to human activity.[13] Misión Tiburón aims to help educate over 3,000 public-school students with the message of “Save the Hammerhead Shark”, with plans to construct a learning station in the port town of Golifto, situated in the Golfo Dulce region along the pacific coast.[14]

Cocos Island Costa Rica

Cocos Island National Park is a marine life hotspot, hosting a variety of biodiversity, 530km from mainland Costa Rica in the Pacific ocean. There are no permanent residents inhabiting the Island apart from park rangers, visiting scientists and tourists on day trips.[15] Misión Tiburón is working with the rangers, conserving the island through education of new biological skills. By training the park rangers on how to obtain scientific data on the pelagic species through technical assistance, Misión Tiburón can collaborate with the research station on Cocos Island to help tackle illegal fishing.[16]