AVALIAÇÃO QUALITATIVA DA ICTIOFAUNA DA LAGOA DA JANSEN, SÃO LUÍS, MA

Este trabalho constitui um levantamento da composicao espacial da ictiofauna da Lagoa da Jansen, situada no perimetro urbano da regiao ocidental da Ilha de Sao Luis (02° 29’ S e 44° 18’ W). A ictiofauna foi capturada utilizando-se redes de emalhar fixa e movel em seis pontos de amostragem estabelecidos em funcao da variacao de salinidade, fluxo de circulacao da agua, mare dinâmica e alteracoes antropicas no entorno da Lagoa, no periodo de novembro/98 a dezembro/99. Foram registradas 24 especies distribuidas entre 19 generos e 18 familias; nao sendo observado diferencas na distribuicao espacial das especies ao longo do eixo longitudinal, corpo central e margens da Lagoa. As especies dominantes foram Mugil curema , Elops saurus e Centropomus paralellus . Sugere-se uma classificacao ecologica de peixes, considerando-se o padrao de distribuicao espaco-temporal, caracteristicas reprodutivas e migracao, estabelecendo-se tres categorias bioecologicas: residentes, transitorias e migradoras/colonizadoras. ABSTRACT Qualitative assessment of  Lagoa da Jansen’s ichthyofauna, Sao Luis, MA This paper places emphasis on the spatial composition of the ichthyofauna of the Lagoa da Jansen, located in the urban perimeter of the western area of the Island of Sao Luis (02° 29’ S and 44° 18’ W). The ichthyofauna was captured by using fixed and mobile gillnets in six sampling sites established according to salinity variation, water flow circulation, dynamic tide and human alterations along the bank of the lagoon. The sampling was carried out between november/98 and december/99. Twenty four species were recorded as belonging to 19 genera and 18 families. Differences in the spatial distribution of the species among the longitudinal axis, central body and margins of the lagoon were not observed. Mugil curema , Elops saurus and Centropomus paralellus were the dominant species. An ecological classification for fish species is suggested based on patterns of temporal-spatial distribution, reproductive features and migration. On the basis, of the criteria used the fishes were split in three bioecological categories: residents, transitory and migratory/colonizing. Key words: ichthyofaunistic composition, temporal-spatial distribution, diversity, trophic composition.