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Population dynamics of Peneaoidea (Crustacea, Decapoda) shrimps commercially exploited (bathymetric distribution, population structure, reproduction, recruitment, mortality, overlap and niche dimensioning) in the Brazilian Southeastern coast

Grant number: 15/14956-4
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): December 01, 2015
Effective date (End): February 28, 2017
Field of knowledge:Biological Sciences - Zoology
Principal Investigator:Rogério Caetano da Costa
Grantee:Israel Fernandes Frameschi de Lima
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

The penaeid shrimps F. brasiliensis, L. schimitti and X. kroyeri are the principal objects of the relevant commercial value fishing, developed in southeastern and south of Brazil. Despite the relevance of species, the constant extraction, associated with environmental degradation, has contributing to the decline in shrimp stocks. Management actions they have been taken to preservation this resource; such as the closing of fisheries and the creation of protected areas. Investigations that provide subsidies for the deployment of management actions are necessary, especially in population dynamics (bathymetric distribution, population structure, reproduction, recruitment, mortality, overlap and niche dimensioning) of commercial interest shrimps. Shrimps and environmental factors (bottom and surface temperature, salinity, organic matter content and granulometry of the sediment) were collected monthly from July 2001 to June 2003 in two regions of northern coast of São Paulo State (Ubatuba and Caraguatatuba cities). Seven transects were determined according to the depth (5, 10, 15, 20, 25, 30 and 35m), perpendicular to coastline, covering approximately 18.000m2. The three species perform very complex life cycle and migrate to initial growth areas like estuaries and coastal areas, then can we verify the existence of changes in the division over time, space and ontogenetic development of species. Information obtained will help to guide future activities for effective management of this food resource, preserving stocks in the future. (AU)