Atlantoraja castelnaui

Atlantoraja castelnaui, commonly known as Castelnaui's ray or the Brazilian skate, is a cartilaginous fish species endemic to the southwestern Atlantic Ocean. This medium-sized skate inhabits the continental shelf waters off the coast of Brazil, typically found at depths ranging from shallow coastal areas to deeper offshore waters. The species is characterized by its flattened body shape typical of rays and skates, with distinctive morphological features that distinguish it from related species in the region. As a bottom-dwelling predator, it feeds primarily on small fish, crustaceans, and other benthic invertebrates. The species has experienced severe population declines that have led to its classification as Critically Endangered by the IUCN. The primary threats driving this decline include intensive fishing pressure from both targeted fisheries and bycatch in trawl fisheries operating throughout its range. The species' limited geographic distribution makes it particularly vulnerable to localized threats and overexploitation. Like many elasmobranchs, Atlantoraja castelnaui has slow growth rates, late sexual maturity, and low reproductive output, making population recovery extremely difficult once declines occur. Conservation efforts for this species remain limited, though it may benefit from broader marine protection measures and fisheries management initiatives in Brazilian waters. The species' critical status highlights the urgent need for targeted conservation action and improved fisheries management to prevent further population decline and potential extinction.