ABSTRACT. Age and growth of Callinectes danae and C. ornatus (Crustacea, Decapoda) in Guanabara Bay, Rio de Janeiro, Brazil. Callinectes danae Smith, 1869 and C. ornatus Ordway, 1863 constitute an important portion from the fishing products at Guanabara Bay. Both species compose a significant by-catch fraction being a lot discarded during shrimp trawlings along Brazilian coast. Growth curves were estimated by modal progression analysis. For the biological parameters it was applied the Bertalanffy growth function and for the age it was used its inverse formula. Growth curves of C. danae and C. ornatus were respectively: LC = 120 (1 -e -0,005t ), LC = 113 (1 -e -0,005t ); LC = 94 (1 -e -0,005t ) and LC = 110 (1 -e -0,005t ). The age for both species reached around 2.5 years, besides to confirm growth curves. Growth study in crustaceans is very important, because besides supplying biological information it subsidizes fishery management for exploted species.

The effects of mechanical stress caused by trawling, handling, air exposure, and discarding during fishing processes can cause irreversible damage to many bycatch organisms. The objective of this work was to evaluate quali-quantitatively the physical damage (loss of limbs) and differential survival among the portunid swimming crabs Callinectes danae Smith, 1869, Callinectes ornatus Ordway, 1863, and Achelous spinimanus (Latreille, 1819) in the pink shrimp trawling fishery in Guanabara Bay, Brazil. Physical damage was quantified by the incidence of lesions for each species in the following categories: male and female; juvenile and adult; and moulting and nonmoulting organisms. The percentage of survivors was obtained through a 24-hour experiment in three consecutive days. The most frequently damaged species was C. danae; 58.9% of this species was observed to be injured. C. ornatus and A. spinimanus presented similar injury frequencies with injuries observed, respectively, in 44.3% and 43.5% of individuals of these species. The Chi-square value for male vs. female; juvenile vs. adult; and moulting vs. non-moulting organisms of each species did not exhibit significant differences except for adults and juveniles of C. danae. The most common type of damage observed among the species was the loss of chelipeds and/or pereiopods. Variance analysis did not detect significant differences in the survival of the various species at the different times of the experiment. The three species presented high survival percentages in all treatments, and live individuals of all species likely show similar recovery rates from trawling stress when returned to the sea. ) RESUMOOs efeitos do estresse mecânico causados pela pesca de arrasto como manipulação a bordo, exposição ao ar e descarte durante a pescaria podem causar danos irreversíveis para muitos organismos capturados como fauna-acompanhante. O objetivo desse trabalho foi avaliar qualiquantitativamente os danos físicos (perda de apêndices) e a sobrevivência dos siris Callinectes danae Smith, 1869, Callinectes ornatus Ordway, 1863 e Achelous spinimanus (Latreille, 1819) após a pesca de arrasto do camarão-rosa na Baía de Guanabara, Brasil. Os danos físicos foram quantificados através da incidência de lesões para cada espécie nas seguintes categorias: machos e fêmeas; jovens e adultos; indivíduos em processo de muda ou não. O percentual de sobreviventes foi obtido através de um experimento de 24 horas realizado em três dias consecutivos. A espécie mais frequentemente danificada foi C. danae; 58,9% dessa espécie estava lesada. Achelous spinimanus apresentou as menores frequências de injúrias observadas em 43,5% dos indivíduos dessa espécie. O valor do quiquadrado entre machos e fêmeas; jovens e adultos; organismos em muda ou não de cada espécie; não exibiu diferença significativa exceto entre jovens e adultos de C. danae. O tipo mais comum de dano observado entre as espécies foi a perda dos quelípodos e ou pereiópodos. A análise de variância não detectou diferenças significativas na s...