Southern Africa’s Most Endangered Shark Just Extended Its Range


A group of marine scientists led by the Wildlife Conservation Society (WCS) has confirmed that the Critically Endangered shorttail nurse shark (Pseudoginglymostoma brevicaudatum; previously Ginglymostoma brevicaudatum) has been discovered to happen in Mozambique – extending their dwelling vary greater than 1,367 miles (2,200 kilometers).

Known as southern Africa’s most threatened endemic shark, it is without doubt one of the smallest family members Ginglymostomatidae (nurse sharks) measuring not more than 30 inches (76.2 centimeters). A tropical reef species discovered within the Western Indian Ocean alongside the coast of Tanzania, Kenya, and Madagascar, their biology and ecology stay largely unknown. The new research, which is revealed within the journal Marine Biodiversity, reveals the invention was based mostly on underwater video surveys collected in 2019, current pictures of shore-based sport anglers’ catches, and the identification of a specimen collected all the best way again in 1967.

The researchers declared that these latest findings increase the vary of the shorttail nurse shark southward by some 1,367 miles (2,200 kilometers) and 683 mi (1,100 km) westward from Madagascar throughout the Mozambique Channel. “Owing to its strong association with coral reefs, it is under particular threat from overexploitation by coastal fisheries and habitat degradation, and is suspected to have declined by more than 80 percent over the last 30 years,” the authors stated in a press release, stressing that this shark was in pressing want of administration attributable to their ‘Critically Endangered’ standing on the International Union for the Conservation of Nature (IUCN) Red List of Threatened Species.

It is unclear as to why the sharks have all of the sudden been noticed here- have been they at all times right here and undetected or is there extra to those new sightings? The authors consider local weather change may be the reply: “Predicted responses for coastal marine fish species as a result of climate change include theoretical range expansions and poleward shifts in distribution ranges driven by broadening thermal gradients and shifting biogeographic boundaries, as recorded for several invertebrate and fish species along South Africa’s east coast.” Whatever the rationale as to why this species has been displaying up right here, scientists are frightened. And for good motive, since there are “no species recovery plans in place for the species and no specific regulations pertaining to its harvest, other than a listing on the Kenyan threatened and protected species list,” as defined by Rhett Bennett, WCS Shark and Ray Conservation Program Manager, Madagascar & Western Indian Ocean.

However, there’s hope for the shorttail nurse shark as one of many information was from Mozambique’s Ponta do Ouro Partial Marine Reserve, suggesting that these sharks might have a point of safety throughout the giant coastal marine protected space (MPA). The first marine transfrontier conservation space in Africa, it stretches from Ponta do Ouro within the south of Mozambique, to the Maputo River Mouth in Maputo Bay within the north, and contains the waters round Inhaca and Portuguese islands.

The authors suggest that the species ought to be thought-about for authorized safety in Mozambique and all through their confined African vary. In addition, they recommend that the suitable entities higher monitor the shorttail nurse shark and talk about improved administration measures to scale back their focused and incidental catch in artisanal and small-scale fisheries.




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