A test of large-scale reproductive migration in females of the amphidromous shrimp Macrobrachium acanthurus (Caridea : Palaemonidae) from south-eastern Brazil
Giovana Bertini A F , J. Antonio Baeza B C D and Eduardo Perez C E
+ Author Affiliations
- Author Affiliations
A LABCRUST (Laboratório de Biologia e Cultivo de Crustáceos), Universidade Estadual Paulista – UNESP - Campus de Registro – Rua Nelson Brihi Badur, 430 Registro – 11900-000, Brazil; NEBECC (Crustacean Biology, Ecology and Culture Study Group).
B Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, FL 34949, USA.
C Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile.
D 132 Long Hall, Department of Biological Sciences, Clemson University, Clemson, SC 29634, USA.
E Centro de Estudios Avanzados en Zonas Aridas (CEAZA), Coquimbo, Chile.
F Corresponding author. Email: gibertini@registro.unesp.br
Marine and Freshwater Research 65(1) 81-93 https://doi.org/10.1071/MF13028
Submitted: 30 January 2013 Accepted: 20 June 2013 Published: 20 September 2013
Abstract
Macrobrachium acanthurus inhabits estuaries and rivers in the western Atlantic. It is not clear whether females migrate towards estuaries to hatch larvae, as reported for other congeneric shrimps. We tested whether females of M. acanthurus exhibit reproductive migrations. The population dynamics of this shrimp was studied in the Ribeira de Iguape River, Brazil. Four sites that differ in position with respect to the coast were sampled monthly during 2007. In M. acanthurus, reproduction was seasonal and reproductive intensity did not vary among study sites. Females brooding early and late embryos were found at all study sites during the reproductive season. No disappearance of reproductive females was observed at the study site located furthest away (~150 km) from the coast. Thus, reproductive females of M. acanthurus do not exhibit reproductive migrations towards estuaries to hatch larvae. Maturity in females was reached at smaller body sizes during the austral summer and spring compared with winter and autumn. Growth rate and body size was sex-specific; males grew slower but attained larger average and final body sizes than females. This information needs to be considered in assessing stocks and establishing sustainable management plans for M. acanthurus in Brazil.
Additional keywords: freshwater prawn, growth, maturity, reproduction, sex ratio
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