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[Creeperopolis]

Ovalipes catharus, commonly known as the paddle crab,[a] swimming crab,[b] or, in Māori, pāpaka,[9] is a species of crab in the family Ovalipidae.[4][10] It is found in shallow, sandy-bottomed waters around the coasts of New Zealand, the Chatham Islands, and uncommonly in southern Australia.[1][2][3] O. catharus is an opportunistic, aggressive, and versatile feeder active mostly at night, preying predominantly on molluscs and crustaceans.[11][12][13] It is also highly prone to cannibalism, which accounts for over a quarter of its diet in some locations.[14] The crab's paddle-shaped rear legs and streamlined carapace allow it to capture prey by swimming rapidly and to escape predation by burrowing in the sand.[15] Its mating season is in winter and spring; the male carries the female until she moults, after which the two mate and the female likely moves into deeper waters to incubate and disperse her larvae.[16][17]

Commercial fisheries have harvested paddle crabs since the 1970s, with catches declining considerably from a peak in the late 1990s.[18] Its population is expected to be increasing,[12] although ecologists have raised concerns that Charybdis japonica, an invasive crab with a similar size, diet, and habitat, could outcompete the paddle crab.[19] O. catharus is present in Māori culture both as an artistic motif and as a traditional source of food.[20]