Dom João de Castro is an isolated seamount located in the Azores archipelago (Northeast Atlantic), between the islands Terceira and São Miguel. The shallower parts of this seamount were formed in 1720, when a volcanic cone emerged from the sea that reached ~ 1-km across and 150-m high (Weston, 1964). This cone was eroded by ocean swells in just four months, and today only a large submerged caldera (300–600 m in diameter) remains whose bottom is at 50-m depth and top is at 13-m depth. Dom João de Castro is an important fishing ground both for demersal fish, such as the black-spot seabream Pagellus bogaraveo and the blue-mouth Helicolenus dactylopterus, and tuna pelagic visitors.

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