Oceanography The Official Magazine of
The Oceanography Society
Volume 23 Issue 01

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Volume 23, No. 1
Pages 200 - 201


SPOTLIGHT • Dom João de Castro Seamount

By Ricardo S. Santos , Fernando Tempera , Ana Colaço, Frederico Cardigos , and Telmo Morato 
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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.


Santos, R.S., F. Tempera, A. Colaço, F. Cardigos, and T. Morato. 2010. Spotlight 11: Dom João de Castro Seamount. Oceanography 23(1):200–201, https://doi.org/10.5670/oceanog.2010.83.


Ávila, S.P., F. Cardigos, and R.S. Santos 2007. Comparison of the community structure of the marine mollusks of the “Banco D. João de Castro” seamount (Azores, Portugal) with that of typical inshore habitats on the Azores archipelago. Helgoland Marine Research 61(1):43–53.

Cardigos, F., A. Colaço, P.R. Dando, S.P. Ávila, P.-M. Sarradin, F. Tempera, P. Conceição, A. Pascoal, and R.S. Santos. 2005. Shallow water hydrothermal vent field fluids and communities of the D. João de Castro Seamount (Azores). Chemical Geology 224(1–3):153–168.

Colaço, A., C. Raghukumar, C. Mohandass, F. Cardigos, and R.S. Santos. 2006. Effect of shallow-water venting in Azores on a few marine biota. Cahiers de Biologie Marine 47(4):359–364.

Lourenço, N., J.M. Miranda, J.F. Luis, A. Ribeiro, L.A. Mendes Victor, J. Madeira, and H.D. Needham. 1998. Morpho-tectonic analysis of the Azores Volcanic Plateau from a new bathymetric compilation of the area. Marine Geophysical Researches 20(3):141–156.

Raghukumar, C., C. Mohandass, F. Cardigos, P.M. DeCosta, R.S. Santos, and A. Colaço. 2008. Assemblage of benthic diatoms and culturable heterotrophs in shallow-water hydrothermal vent of the D. Joao de Castro Seamount, Azores in the Atlantic Ocean. Current Science 95:1,715–1,723.

Sobrinho-Gonçalves, L., and F. Cardigos. 2006. Fish larvae around a seamount with shallow hydrothermal vents from the Azores. Thalassas–An International Journal of Marine Sciences 22(1):19–28.

Weston, F.S. 1964. List of recorded volcanic eruptions in the Azores with brief reports. Boletim do Museu e Laboratório Mineralógico e Geológico da Universidade de Lisboa 10:3–18.

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