Abstract
In 1987 and 1989 coelacanths were observed for the first time in their natural habitat with the help of submersibles. Coelacanths were found between 150–253 m depth, their preferential depth seems to be around 200 m; the water temperature ranged between 16.5–22.8° C. During the day coelacanths aggregate in small non-aggressive groups in sheltered lava-caves. Caves might be a limiting factor for distribution. At night they leave the caves for hunting by drifting singly along the steep lava slopes. They migrate between different caves located within a large home range covering more than 8 km coastline. Coelacanths are site-attached, some for a period of at least 2 years. Our own observations and earlier catch records show that only the west coast of Grand Comoro is a suitable coelacanth habitat with more structural complexity and prey fish abundance than other coastlines of the island. From our survey we estimated a total coelacanth population off Grand Comoro to be 150–210 individuals; a saturated population would be 370–510 individuals. This small relict population seems to be stable. International protection of coelacanths against commercial interests is needed.
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Fricke, H., Hissmann, K., Schauer, J., Reinicke, O., Kasang, L., Plante, R. (1991). Habitat and population size of the coelacanth Latimeria chalumnae at Grand Comoro. In: Musick, J.A., Bruton, M.N., Balon, E.K. (eds) The biology of Latimeria chalumnae and evolution of coelacanths. Developments in environmental biology of fishes, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3194-0_20
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DOI: https://doi.org/10.1007/978-94-011-3194-0_20
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