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Duration of the pre-settlement period of the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) under laboratory conditions BABT
Ventura,Robson; Silva,Ubiratã de Assis Teixeira da; Perbiche-Neves,Gilmar; Ostrensky,Antonio; Boeger,Walter Antonio Pereira; Pie,Marcio Roberto.
The goal of the present study was to determine the most appropriate time to release the immatures of Ucides cordatus (Linnaeus) produced in the laboratory into the natural environments. Specifically, the time when the megalopae sought the mangrove sediment to excavate the burrows was determined, as well as the time necessary for their metamorphosis into the first juvenile stage. Results indicated that the megalopae of U. cordatus reared in the laboratory took three to ten days (median = 6) after their molt to excavated burrows in the sediment. The average time for the megalopae to molt into juveniles was 12.6 days (SD = 2.3).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ucides cordatus; Restocking; Larval rearing; Settlement; Megalopae; Juvenile.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500012
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Fish predation on brachyuran larvae and juveniles in the Pinheiros river, Guaratuba Bay, Paraná, Brazil Rev. Bras. Zool.
Costa,Paulo V.; Silva,Ubiratã A. T. da; Ventura,Robson; Ostrensky,Antonio; Angelo,Leandro.
Fish predation is thought to exert an important influence on the demographical dynamics of larvae and juveniles of estuarine brachyuran crabs but few studies have investigated this phenomenon in nature. In this study, fishes were captured during full moons (in January and February 2005), when many brachyuran species are known to release their larvae. Samples were carried out in the Pinheiros river, Guaratuba Bay, Paraná, Brazil. The stomach contents of collected fishes were surveyed to determine the species that are most likely to prey on brachyuran immature forms in this location. Two techniques were used to capture fishes: manual samplings, using a 5-mm mesh size net (1.8m depth), and bottom trawling with a 20-mm mesh size net. The collected specimens...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crab; Megalopae; Osteichthyes; Predator; Ucides cordatus; Zoeae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200005
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