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Neste trabalho, as espécies C. danae e C. ornatus foram comparadas quanto ao peso dos quelípodos. Os siris foram coletados com 2 redes de arrasto do tipo "otter trawl" na Enseada de Ubatuba (23° 26' S e 45° 02' W). As constantes alométricas obtidas foram analisadas por meio da função potência (Y = aXb ). As espécies apresentaram diferentes graus alométricos para cada sexo. A relação PQ X PC apresentou alometria positiva em ambas espécies, porém os machos apresentam maior alometria positiva do que as fêmeas. C. danae apresenta maior alometria positiva para os quelípodos do que C. ornatus. O fato de C. danae atingir maior porte e possuir quelípodos maiores indica que esta espécie tem potencial para o cultivo. A comparison of the cheliped's weight in two species of the genus Callinectes was accomplished. The species C. danae e C. ornatus were collected by two otter trawl in Ubatuba bay (23º 26' S and 45º 02' W). The allometric constants obtained from the regression adjusted to a power function (Y = aXb) were analyzed. These species presented different allometry degrees for each sex considered. The relation PQ x PC presented positive allometry for sex of both species, but male presented higher positive allometry than female. C. danae presented higher positive allometry for chelipeds than C. ornatus. We suggest here that C. danae could be indicated to be submitted to grow out in ponds since it reaches higher size and bigger chelipeds

Comparação do peso dos quelípodos e crescimento em duas espécies de "sirís" do gênero Callinectes (Brachyura, Portunidae)