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Growth and reproductive dynamics of the shrimp Rimapenaeus constrictus (Stimpson, 1874) (Penaeoidea) in the Northern Coast of São Paulo: synthesis of a 5-year study

Grant number: 15/13639-5
Support type:Scholarships in Brazil - Master
Effective date (Start): October 01, 2015
Effective date (End): August 31, 2017
Field of knowledge:Biological Sciences - Zoology - Morphology of Recent Groups
Principal researcher:Antonio Leão Castilho
Grantee:Ana Elisa Bielert Lopes
Home Institution: Instituto de Biociências (IBB). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
Associated research grant:10/50188-8 - Decapod crustaceans: multi-disciplinary characterization of the sea biodiversity of the State of São Paulo (taxonomy, spermiotaxonomy, molecular biology and population dynamics), AP.BTA.TEM


Population dynamics is among the main parameters used to evaluate the fishing-effort effects over targeted species, as over those composing the bycatch. This study is unprecedented to investigate in large scale the population dynamics of the shrimp Rimapenaeus constrictus, in its both spatial and temporal aspects, once this species is largely exploited as bycatch at Western Atlantic. Therefore, R. constrictus' population parameters will be analyzed, such as sex ratio, average size of individuals and size at onset of sexual maturity, condition factor (fattening degree), gonadossomatic index, growth, longevity, and periods and sites where juvenile recruitment would be taking place. Samples were performed monthly at the northern portion of São Paulo State's littoral area, from January 1998 to June 2003, using a shrimp-fishing boat outfitted with double-rig nets. Four quarterly samples will be performed at the Ubatuba coastal area throughout 2015, to obtain sufficient data to analyze the condition factor and gonadossomatic index. Individuals are going to be classified to its sex, measured to its carapace length (CL) and grouped into demographic classes according to its morphological and gonadal development. Female bodies (FW) and its dissected gonads (GW) are going to be weighed using an analytical balance in order to determinate its gonadossomatic index (GSI), which is given by "GSI=(GW/FW)*100". Using suitable statistical analyses for each goal, it is proposed to describe the population structure and to determinate the intensity from which each environmental factor influences the growth pattern and reproductive dynamics of R. constrictus. This study will provide valuable information which will contribute to the large scale knowledge concerning R. constrictus' biology and, added to the current studies carried out for other species of Penaeoidea, can be used for developing strategies which minimizes the non-selective exploitation of profitable and non-profitable resources which presents distinctive population features. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DA SILVA, ALEXANDRE R.; LOPES, ANA ELISA B.; GRABOWSKI, RAPHAEL C.; CASTILHO, ANTONIO L.. Weight/carapace length relationship and condition factor of the roughneck shrimp, Rimapenaeus constrictus (Stimpson, 1874), on the southeastern Brazilian coast. Anais da Academia Brasileira de Ciências, v. 93, n. 2, . (15/13639-5, 98/07090-3, 10/50188-8)
RENAN AUGUSTO PEREIRA DOS SANTOS; ALEXANDRE RIBEIRO DA SILVA; ISABELA RIBEIRO ROCHA DE MORAES; MARIANA ANTUNES; ANA ELISA BIELERT LOPES; ROGÉRIO CAETANO DA COSTA; ANTONIO LEÃO CASTILHO. Gonadosomatic index and weight/length relationship in females of three penaeoidean shrimps impacted by fisheries on the southeastern Brazilian coast. Nauplius, v. 28, . (15/01959-5, 15/13639-5, 10/50188-8)
LOPES, ANA ELISA B.; GRABOWSKI, RAPHAEL C.; GARCIA, JOYCE R.; FRANSOZO, ADILSON; DA COSTA, ROGERIO C.; HIROKI, KATIA A. N.; CASTILHO, ANTONIO L.. Population dynamics of Rimapenaeus constrictus (Stimpson, 1874) (Penaeoidea) on the southeastern Brazilian coast: implications for shrimp fishing management from a 5-year study on a bycatch species. Anais da Academia Brasileira de Ciências, v. 89, n. 2, p. 1013-1025, . (10/50188-8, 15/13639-5, 98/07090-3)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)

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