-The objective of this work was to compare the morphometry of hatchery-reared and wild-caught mangrove crab (Ucides cordatus) megalopae. Ten U. cordatus megalopae of each group (hatchery-reared and wild-caught) were individually analyzed using a stereoscopic microscope equipped with an ocular micrometer. Length, width, and height of all megalopae were measured, and the size of body appendices was determined. The results indicate that the hatchery-reared megalopae are more robust than the wild ones. Furthermore, some significant differences in the size of certain appendices can be cues of the kind of alterations that hatchery-reared individuals experience.Index terms: Ucides cordatus, body appendices, larviculture, rearing-environment, restocking programs. Comparação morfométrica entre megalopas do caranguejo do mangue produzidas em laboratório e capturadas na naturezaResumo -O objetivo deste trabalho foi comparar a morfometria de megalopas de caranguejo do mangue (Ucides cordatus) produzidas em laboratório e capturadas na natureza. Dez megalopas de U. cordatus de cada grupo (produzidas em laboratório e capturadas na natureza) foram analisadas individualmente utilizando microscópio estereoscópico equipado com ocular micrométrica. Comprimento, largura e altura de todas as megalopas foram medidos, e o tamanho dos apêndices corporais foi determinado. Os resultados são indicativos de que as megalopas produzidas em laboratório são mais robustas que as selvagens. Além disso, algumas diferenças significativas no tamanho de certos apêndices podem ser pistas do tipo de alterações que os indivíduos produzidos em laboratório experimentam.Termos para indexação: Ucides cordatus, apêndices corporais, larvicultura, ambiente de cultivo, programas de repovoamento.
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