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Vila Velha, Brazil

Rosa D.M.,Nucleo de Atividades Ambientais | Vilar C.C.,Nucleo de Atividades Ambientais | Vilar C.C.,Federal University of Parana | Musiello-Fernandes J.,Nucleo de Atividades Ambientais | Musiello-Fernandes J.,Federal University of Espirito Santo
Boletim do Instituto de Pesca | Year: 2015

The relative effect of seasonality and body size on the diet composition of juvenile Lutjanus synagris was investigated at a sheltered sandy beach (20º18’S; 40º16’W) on the coast of Espírito Santo state, Brazil. Monthly collections were carried out during the daytime from May 2004 to April 2005, using a beach seine. The specimens captured in each season (e.g. cold/dry, May to October 2004; hot/rainy, November 2004 to April 2005) were separated into three total length (TL) classes (≤ 40; 41–50; ≥ 51 mm). The stomach contents of 540 specimens with TL ranging from 22 to 135 mm were analyzed. Among the 13 food items consumed by L. synagris, the most important were Amphipoda (Index of Relative Importance, IRI = 81.2), Isopoda (IRI = 13.8) and Mysidacea (IRI = 4.4). Significant variations in the diet composition were observed between the seasons (PERMANOVA; P < 0.001), but not between the size classes (P = 0.170). There was, however, a significant interaction between these two factors (P<0.001), indicating that the differences between the seasons did not occur in every class. The most important items in the cold/dry and hot/rainy seasons were, respectively, Mysidacea and Amphipoda, for every class. The average length of the preys varied significantly (P<0.05) between the size classes, increasing progressively with the TL of the fishes. Overall, the results indicate a carnivore-opportunist food habit for L. synagris, with significant seasonal changes in the relative importance of the food items. © 2015, Instytut Technologii Drewna. All rights reserved.

Vilar C.C.,Nucleo de Atividades Ambientais | Vilar C.C.,Federal University of Parana | Spach H.L.,Federal University of Parana | Souza-Conceicao J.M.,University of the Region of Joinville
Pan-American Journal of Aquatic Sciences | Year: 2011

Fish assemblage structure and physical-chemical characteristics were analyzed in shallow areas of Baía da Babitonga, southern Brazil, by seasonal sampling at 13 sites distributed along the bay's shoreline. Two sectors (outer and inner) were defined within the bay according to salinity. In total, 71,085 fishes belonging to 70 taxa and 30 families were collected. The majority of collected taxa (45) were exclusively represented by juvenile fishes. Unidentified engraulids, Eucinostomus spp., Mugil spp., Atherinella brasiliensis, Anchoa januaria, Harengula clupeola, Anchoa tricolor, Oligoplites saliens and Sphoeroides greeleyi were numerically dominant, contributing 93.8% of captured fishes. Taxa exclusive of one or the other sector showed low abundance, but several species clearly tended to occupy specific regions of the estuary. Spatial variations in body size were indicated for the nine dominant taxa. The number of species, individuals and equitability varied significantly among months but not sectors. However, a high turnover in species composition occurred among sampling sites, with the average number of taxa per site (30.8) corresponding to less than half of the total number of registered taxa (70).

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