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Porto Alegre, Brazil

Bertaco V.A.,Laboratorio Of Ictiologia | Malabarba L.R.,Federal University of Rio Grande do Sul
Neotropical Ichthyology | Year: 2013

Hollandichthys taramandahy, new species, is described from the rio Tramandaí, rio Mampituba, and rio Araranguá basins, coastal drainages of Rio Grande do Sul and Santa Catarina States, Brazil. The new species is distinguished from H. multifasciatus, the single recognized species of the genus, by the presence of a small black spot covering the base of median caudal-fin rays, by the lower number of dorsal and ventral procurrent caudal-fin rays, by the absence of a black spot located along anterior half of adipose-fin, and by the absence of humeral spot in specimens larger than 60 mm of standard length. Comments about the geographic distribution and diagnosis are provided for the genus. © 2013 Sociedade Brasileira de Ictiologia.

De Lucena C.A.S.,Grande Rio University | Bertaco V.A.,Laboratorio Of Ictiologia | Berbigier G.,Grande Rio University
Zootaxa | Year: 2013

Astyanax pirabitira, new species, is described from the upper portion of the rio das Antas, laguna dos Patos system, and from the rio Pelotas, upper rio Uruguay drainage, Rio Grande do Sul State, Brazil. The new species belongs to the A. scabripinnis species complex and differs from its congeners by a combination of characters, viz., body depth (27.1-34.0% of standard length), narrow interorbital width (22.2-28.7% of head length), head depth (72.9-97.0% of HL), number of branched anal-fin rays (15-20), number of lateral line scales (37-40), one or two maxillary teeth, two humeral spots and absence of secondary sexual characters (bony hooks in the fins or other differences in the morphology). Comments on the endemic fish fauna of the region are presented. Copyright © 2013 Magnolia Press.

De Lucena C.A.S.,Grande Rio University | Castro J.B.,Grande Rio University | Bertaco V.A.,Laboratorio Of Ictiologia
Neotropical Ichthyology | Year: 2013

Three new species of Astyanax are described from southern Brazil: A. dissensus and A. xiru from the laguna dos Patos system and rio Uruguay basin, the first species also occurring in the rio Tramandaí system, and A. procerus from the laguna dos Patos system. Astyanax procerus and A. xiru possess outer row premaxillary teeth pentacuspid and inner row heptacuspid, maxillary with one tri- to pentacuspid teeth, 18-23 branched anal-fin rays, and two humeral spots. Astyanax procerus has the largest body depth (38.3-46.0% of SL), while A. xiru has the lowest body depth (32.5-37.5% of SL) among the three species. The characters combination can distinguish these species from its congeners. Astyanax dissensus distinguish from Astyanax species by the presence of one developed heptacuspid teeth on maxillary, 22-28 branched anal-fin rays, 35-39 perforated scales along the lateral line, two humeral spots, conspicuous lateral band continuous on middle caudal rays, 6-7 scale row between dorsal-fin origin and lateral line, and head length 22.7-27.3% of SL. All three species has the predorsal region of the body scaled. An identification key to the species of Astyanax species from the rio Uruguay basin, and laguna dos Patos and rio Tramandaí systems is provided. © 2013 Sociedade Brasileira de Ictiologia.

Freitas M.O.,Laboratorio Of Ictiologia | de Moura R.L.,Conservation International Brazil | Francini-Filho R.B.,Federal University of Paraiba | Minte-Vera C.V.,State University of Maringa
Scientia Marina | Year: 2011

Although information on the spawning seasons of commercially important snappers (Lutjanidae) and groupers (Serranidae, subfamily Epinephelinae) is available for the north and central west Atlantic, there is little information for the tropical western South Atlantic (Brazil). As a consequence, there are few fishery regulations in this entire region that take into consideration such information. In this study, we characterized the reproductive cycles of three Epinephelinae serranids (Epinephelus morio, Mycteroperca bonaci and Cephalopholis fulva) and five lutjanids (Lutjanus synagris, L. jocu, L. analis, Ocyurus chrysurus and Rhomboplites aurorubens) that occur in the Abrolhos Bank, Brazil, the largest reef complex in the tropical western South Atlantic. A total of 3528 gonads were collected from May 2005 to October 2007. Temporal variability in spawning patterns was evaluated using the Gonadosomatic Index (GSI) and macroscopic analyses. The peak of reproductive activity for the three grouper species occurred between July and August. Snappers exhibited two peaks of reproductive activity, the more intense of which occurred between September and October. The other peak occurred between February and March, with the exception of the deep-dwelling species R. aurorubens, which only reproduced between February and March. Seasonal patterns were consistent over the two consecutive years that we studied, and these patterns are equivalent to those observed for the Northern Hemisphere, as are the sizes at maturity and at the time of sexual change (for the three protogynous hermaphrodite groupers). Fisheries management in this region could be significantly improved by a combination of catch and effort limitations being imposed during spawning seasons and by overall size limitations, particularly considering that most of the fish caught are generally below size at maturity. The proposed buffer zones for the marine areas that are presently protected in Abrolhos represent an opportunity for implementing both spatial (e.g. setting no-take zones that cover spawning sites) and temporal (e.g. seasonal closures during spawning peaks) management tools, using a participatory approach at the regional scale.

During the months of October 2004 and June 2005, collections were made to identify the fish fauna associated with a culture of Perna perna mussel located in the district of Paulas, in the municipality of San Francisco do Sul, Santa Catarina State. It collected a total of 511 fish corresponding to seven species and six families (Blenniidae, Gobiidae, Labrisomidae, Serranidae, Gobiesocidae and Monacanthidae), the species Hypleurochilus fissicornis, Bathygobius soporator and Gobiesox strumosus being the most abundant. H. fissicornis was dominant in the samples and was present, along with G. strumusus, in all sampling months. B. soporator was not recorded in the month of October, and the remaining species occurred in two or three samplings, with the exception of the exotic specie Omobranchus punctatus, which occurred in a single sample (September 2005), corroborating its record in the area. The average values of biomass and abundance increased in the months near summer, with peak capture occurring in the month of January 2005. In the analysis of grouping by hand size, greater similarity was observed mainly in the hands sampled during the summer, which was observed with larger hand lengths. The cultivation of mussels creates a new substrate favorable to the occupation of several marine species by encouraging the growth and establishment of potentially competing, commercially important and/ or threatened species.

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