Variações temporais e espaciais na composição e estrutura da comunidade de peixes jovens da Baía de Sepetiba, Rio de Janeiro

Abstract

ABSTRACT. Spatial and seasonal variations in community fish structu re of juvenile fish in Sepeliba Bay, Rio de Janeiro. A year-Iong beach seine survey at the continental margin of Sepetiba Bay, Rio de Janeiro State, Brazil, catching mainly young-of-the-year andjuvenile fishes was carried out from July 1983 to June 1984, in order to describe the community structure and their spatial and seasonal variations. Fifty-five monthly samplied carried oul in tive sites in the marginal surfzone waters yielded 11,463 fishes in 82 species, 59 genera and 31 families. Gerreidae, Engraulididae, Atherinidae and Ariidae families amounted 87.01 % ofthe total catch in number, and 81 % in weighl. Gerres aprion Cuvier, 1829, Anchoa januaria (Steindachner, 1879), Anchoviella lepidentostole (Fowler, 1911), Atherinella brasiliensis (Quoy & Gaimard, 1824) and Netuma barba (Lacépede, 1803) were the most numerous species, each one contributing more the 4% of total catch. Overall, both spatial and seasonal changes in fish were not evident although most individuais were more abundant in the outer Bay. The high number of fish species in this area, suggest the important role played by the Sepetiba Bay in the fish community to where many species probably migrate from the nearby sea and stay in the Bay during part of their life cyc1e. Decreasing diversity and high dominance of a few number of species seem to indicated a trend of environmental deterioration in the Sepetiba Bay over the last decade, as this date are compared whith simi lar sampling program carried out in 1993/94. It sarne to indicated that changes in fish populations which use this area as rearing grounds, occurred during their eariy life history.

Spatial and temporal variations of diurnal ichthyofauna on surf-zone of São Francisco do Itabapoana beaches, Rio de Janeiro State, Brazil

“…The ichthyofauna consisted of juveniles of many species, most of then non-dominants. This pattern has been largely described at other beaches (Giannini, 1994;Ayivazian and Hyndes, 1995;Clark, 1997;Pessanha et al, 2000;Gaelzer, 2000). Fishes commonly use surf-zones as nursery and growth grounds, profiting by food abundance and protection against predation (Lasiak, 1984).…”

“…Selene setapinnis Other studies in Brazil (Monteiro-Neto et al, 1990;Pessanha et al, 2000) and other countries (Clark et al, 1994) also considered freshwater species as rare and few abundant on estuarine beach adjacencies. Manguinhos and Gargaú beaches registered increased variety of species in summer months (Fig.…”

“…Species richness and abundance (number of individuals and wet weight) presented statistically significant spatial and temporal variations (Table 2). In Brazilian estuaries, high abundances of catfish (Ariidae) were common, comprising almost 8.0% of the total catching on Sepetiba Bay, southern Rio de Janeiro State (Pessanha et al, 2000). Godefroid (1996) (Table 3).…”

Efeito do grau de exposição às ondas sobre a comunidade de peixes juvenis em praias arenosas do Município do Rio de Janeiro, Brasil

“…Trachinotus carolinus, por outro lado, ocorreu com uma maior abundância na zona abrigada durante a primavera embora seja citada como uma espécie típica de zonas expostas (Modde & Ross 1983). Esta espécie é praticamente ausente das praias arenosas no interior da Baía de Sepetiba, embora ocorra em abundância em praias adjacentes a esta baía (Pessanha et al 2000).…”

Comparative Analysis of Distribution of Intertidal Fish Assemblages in Different Estuarine Systems on Northern Coast of Brazil

“…However, these fish use the area under the greatest influence by the ocean for recruitment and development (Pessanha et al, 2000). Spatial separation may reflect adaptations to different environmental conditions or a strategy to avoid competition (Silva et al, 2003).…”