"It might reasonably be expected," says Sir J. Gardner Wilkinson, "that the raad, or electric fish of the Nile, would be one of the most sacred, and forbidden for food; and it seems not to be represented among those caught in the ancient fishing scenes." He adds regarding the raad:—"It is a small fish, and the one I saw measured little more than a foot long by four inches in depth, but it had the power of giving a very strong shock. It is the Melapterurus electricus, and may have been the ancient Latus."
Source: wiktionary