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Caracterização morfológica e distribuição temporal de larvas e juvenis de Apareiodon affinis (Steindachner) (Osteichthyes, Parodontidae) no alto rio Paraná, Paraná

Morphological characterization and temporal distribution of larvae and juveniles of Apareiodon affinis (steindachner) (osteichthyes, PArodontidae) in upper Paraná River, Paraná

Resumo

With the purpose of characterizing morphologicaly the larvae and juveniles of Apareiodon affinis (Steindachner, 1879) and to verify their temporal distribution monthly samples were taken at Leopoldo's Inlet, upper Paraná River. The specimens were captured with a conic-cylindrical plankton net of mesh size 0,5mm from March 1991 to February 1992. Soon after identification, the specimens were separeted according to their development (prefle-xion, flexion, posflexion and juvenile) and then the moiphometric analyses were performed. The results showed that the larvae were captured from August 1991 to February 1992, with greatest densities in November 1991. The specimens occured in every timetable, however, larvae in pretlexion and flexion were captured during day time and, posflexion and juvenile, at night. According to series of morphological development, high body proportions variation were verifyed mainly in the head lenght, eye diameter and in height body. Moreover, the individuais showed little pigmentation and myomeres number changing between 39 to 42. The majority of morphometric characteristics have negative allometry with the cxception of head lenght with regard to standart lenght that have positive allometry.

Apareiodon affinis; morphological development; temporal distribution; upper Paraná River


Apareiodon affinis; morphological development; temporal distribution; upper Paraná River

Caracterização morfológica e distribuição temporal de larvas e juvenis de Apareiodon affinis (Steindachner) (Osteichthyes, Parodontidae) no alto rio Paraná, Paraná

Morphological characterization and temporal distribution of larvae and juveniles of Apareiodon affinis (steindachner) (osteichthyes, PArodontidae) in upper Paraná River, Paraná

Andréa Bialetzki; Paulo Vanderlei Sanches; Gilmar Baumgartner; Keshiyu Nakatani

Departamento de Biologia/Nupélia, Curso de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá. Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brasil. E-mail: agostinhoaa@wnet.com.br

ABSTRACT

With the purpose of characterizing morphologicaly the larvae and juveniles of Apareiodon affinis (Steindachner, 1879) and to verify their temporal distribution monthly samples were taken at Leopoldo's Inlet, upper Paraná River. The specimens were captured with a conic-cylindrical plankton net of mesh size 0,5mm from March 1991 to February 1992. Soon after identification, the specimens were separeted according to their development (prefle-xion, flexion, posflexion and juvenile) and then the moiphometric analyses were performed. The results showed that the larvae were captured from August 1991 to February 1992, with greatest densities in November 1991. The specimens occured in every timetable, however, larvae in pretlexion and flexion were captured during day time and, posflexion and juvenile, at night. According to series of morphological development, high body proportions variation were verifyed mainly in the head lenght, eye diameter and in height body. Moreover, the individuais showed little pigmentation and myomeres number changing between 39 to 42. The majority of morphometric characteristics have negative allometry with the cxception of head lenght with regard to standart lenght that have positive allometry.

Key words:Apareiodon affinis, morphological development, temporal distribution, upper Paraná River.

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Recebido em 05.VI.1997; aceito em 25.XI.1998.

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Datas de Publicação

  • Publicação nesta coleção
    01 Jul 2009
  • Data do Fascículo
    Dez 1998

Histórico

  • Aceito
    25 Nov 1998
  • Recebido
    05 Jun 1997
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