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JPR Advance Access published online on August 3, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh123
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Received February 11, 2004
Accepted June 25, 2004

Article

Eggs and larvae of the "Curvina" Plagioscion squamosissimus (Heckel, 1840) (Osteichthyes, Sciaenidae) in the Baía River (Mato Grosso do Sul State, Brazil)

Andréa Bialetzki 1*, Keshiyu Nakatani 1, Paulo Vanderlei Sanches 2, Gilmar Baumgartner 3

1 Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (NUPÉLIA) - Universidade Estadual de Maringá (UEM), AV. Colombo, 5790, Bloco G-90, CEP 87020-900, Maringá, Paraná, Brazil; Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais, Departamento de Biologia, UEM.
2 Universidade Paranaense (UNIPAR), AV. Parigot de Souza, 3636, CEP 85903-170, Toledo, Paraná, Brazil;
3 Centro de Engenharias e Ciências Exatas, Universidade Estadual do Oeste do Paraná (UNIOESTE), Rua da Faculdade, 2550, CEP 87030-900, Toledo, Paraná, Brazil.

* To whom correspondence should be addressed. E-mail: bialetzki{at}nupelia.uem.br.


  Abstract

The aim this work is the study of the eggs and larvae of the "curvina", specifically the examination of spatial and temporal variation, location of spawning and dispersal grounds, and verification of the relationship between occurrence and environmental variables. Sixteen collection sites were established in the Baía River, Brazil, and grouped into four areas. Collections were carried out between February 1999 and April 2000. Spatial and temporal variations were analysed using ANOVA. Identification of the spawning and dispersal grounds was carried out using development stage distribution. The relationship between occurrence and the environmental variables was determined using Principal Components Analysis (PCA) and Pearson Correlation. The eggs were found in every area practically every month, almost exclusively in the initial embryo stage, while the larvae occurred in every area mainly between October and April. The correlation between PCA scores and organism occurrence demonstrated that the highest catches occurred when the values of temperature, water level and rainfall were high and those of dissolved oxygen and pH were low. This specie spawn and development in lentic areas and the lotic stretch serves as a dispersal route through which the eggs and larvae are transported.


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