Meat yield of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Crustacea, Brachyura, Ucididae)

Specimens of Ucides cordatus were captured from September 1998 to September 2000 in mangroves from Iguape, SP, Brazil (24 degrees 41'25 ''S - 47 degrees 27'48 ''W) and analyzed by sex, biological period (reproductive, October to March; and non-reproductive, from April to September) and size. The meat yield of each corporal structure, and the residuals were quantified. Each crab was measured (carapace width) with a vernier caliper (0.05 mm) and their corporal structures weighed with an analytic scale (0.0001 g). Biometric variables were previously tested (normality and homoscedasticity) with indication of a statistical parametric procedure (ANOVA) at 5% significance level. Males had higher wet weight than females, the same occurring when their corporal structures were compared (p<0.05). The meat yield in males was of 25.4%, a little above than what was registered in females (21.1%); meat yield hierarchy among corporal structures was very similar between sexes and biological periods, but differing in relation to chelipeds, which were bigger in males. During the reproductive period males had a bigger meat yield due to their size when compared to males of non-reproductive period, as well as with females independently of their biological period. The expressive meat yield in males can be explained by the positive allometric growth of the chelipeds after puberty molt when this structure grows proportionally more than the body itself, accounting for 40% of the total wet weight in this gender.Espécimes de Ucides cordatus foram capturados de setembro de 1998 a setembro de 2000, nos manguezais de Iguape, SP, Brasil (24º41’25''S – 47º27’48''O) e analisados por sexo, período biológico (reprodutivo: outubro a março; e não reprodutivo: abril a setembro) e tamanho. O rendimento de carne de cada estrutura corporal e os resíduos foram quantificados. Cada caranguejo foi medido (largura da carapaça) com um paquímetro (0,05 mm) e suas estruturas corporais pesadas com uma balança analítica (0,0001 g). As variáveis biométricas foram previamente testadas (normalidade e homocedasticidade) com indicação de um procedimento estatístico paramétrico (ANOVA) ao nível de 5% de significância. Os machos apresentaram maior peso úmido do que as fêmeas, o mesmo ocorrendo quando suas estruturas corporais foram comparadas (p