出版社：Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul
摘要：The use of shallow environment by fishes in antonina bay, paraná
Shallow areas are important places for refugee to fish populations, besides offering abundance of
food. The description of fish assemblages in estuarine environments is indispensable to make
managements decisions. Such description gives subsidies that will be underlying measures for the
sustained use of these areas, as well as monitor the effects of their utilization. Samples were taken from
April 2000 to March of 2001 in two intertidal areas in the Bay of Antonina. Two monthly seines were
made in each area, at low ebb tide, with a “picaré” seine net. 17.386 specimens corresponding to 43 taxa
and 22 families were collected, with Engraulidae being the most representative family. The species
Anchoa parva was the most abundant, representing 40,3% of the total capture. In the samples, smaller individuals prevailed, and 80% of the individuals were constituted of immature fishes. Most taxa (29)
were present in low abundance (up to 1% of the total catch) and occurred occasionally (less than 6
months of 12). Significant differences among sampling months were observed in the mean number of
species, with the largest averages occurring in summer. However, no significant difference were found
among the number of individuals caught along the year. The richness and diversity indexes showed
greatest values in summer and beginning of autumn. Pielou’s equitability presented significant differences
among months of smaller means. In local studies was observed the numeric dominance of resident and
marine-estuarine species. This paper presents the first register of Trachinotus falcatus in areas with
mean salinity < 10, in Antonina. Most of species with sporadic occurrence and low abundance are in
majority estuarine-dependents being responsible for temporal variation of the species diversity. On the
other hand, seasonal differences in the number of caught fish are more associated with numerically
dominant species.
