The growth of three West African marine catfish, Arius heudeloti, A. parkii, A. latiscutatus (Siluriformes, Ariidae), was studied in Guinea by examining sections of the first dorsal spine. Age and growth interpretations were possible for fish up to 40 cm and the
three species reveal a similar biology. A single annulus is formed each year at the beginning of the rainy season. Growth seems to be slow, and 40 cm fork length individuals are about 6 years old. These ariids can reach large sizes (80 cm or larger), which may indicate that the natural mortality
is low. This adaptativeness is probably related to their strong body protection against predators, their low fecundity and egg incubation.
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