Laboratorio Of Ictiologia

Porto Alegre, Brazil

Laboratorio Of Ictiologia

Porto Alegre, Brazil
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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 Maringá
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.

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.

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.

Martinez-Mendez N.,Laboratorio Of Ictiologia | Mejia O.,Laboratorio Of Variacion Biologica Y Evolucion | Rocha-Gomez A.,Laboratorio Of Variacion Biologica Y Evolucion | Mendez-De La Cruz F.R.,National Autonomous University of Mexico
Zoologica Scripta | Year: 2012

The systematics of the subspecies included in Sceloporus serrifer has undergone several taxonomic and nomenclatural rearrangements. This species previously comprised two recognized subspecies, Sceloporus serrifer serrifer and Sceloporus serrifer prezygus, which inhabit contrasting habitats. In this study, we re-evaluate the taxonomic status of both subspecies using molecular and morphological evidence. Sceloporus serrifer serrifer was recovered as a paraphyletic group, whereas S. s. prezygus was recovered as a polyphyletic group. The molecular results indicate the existence of two independent lineages that diverged at least 1.29Myr, with the populations currently recognized as S. s. prezygus from the Cuchumatanes Mountains representing a secondary invasion of S. s. serrifer from the lowlands. The lack of meristic differences among the highland populations of different species suggests convergence in similar environments achieved by two different lineages. © 2012 The Authors. Zoologica Scripta © 2012 The Norwegian Academy of Science and Letters.

Azevedo M.A.,Laboratorio Of Ictiologia | Bertaco V.A.,Laboratorio Of Ictiologia
Check List | Year: 2016

The ichthyofauna herein presented was collected in streams, lake, and swamps from the Parque Estadual de Itapeva, Rio Mampituba basin. The protectedarea is located in the northernmost part of the coastal plain of Rio Grande do Sul state. Samplings resulted in 26 species, in 20 genera, 15 families, and six orders. Two species are listed as threatened and one near threatened in Rio Grande do Sul. This study represents the first fish survey in the protected area, Atlantic Forest biome. © 2016 Check List and Authors.

Astyanax douradilho, new species, is described from the rio Tramandaí system, coastal drainage of Rio Grande do Sul State, Brazil. The new species is distinguished from its congeners by possessing 37-39 perforated scales along the lateral line, 3-5 maxillary tricuspid teeth, 22-24 branched anal-fin rays, absence of a conspicuous dark stripe from humeral re-gion to caudal peduncle, two vertically elongated humeral spots, head length (26.0-29.9% of standard length), upper jaw length (43.8-50.6% of head length), and snout length (23.0-28.6% of HL). Copyright © 2014 Magnolia Press.

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.

Bertaco V.A.,Laboratorio Of Ictiologia | Vigo A.C.,Laboratorio Of Ictiologia
Neotropical Ichthyology | Year: 2015

A new Astyanax is described from the rio Taquari-Antas basin, rio Jacuí drainage, laguna dos Patos system, Rio Grande do Sul State, Brazil. The new species is distinguished from its congeners inhabiting the rio Uruguay, laguna dos Patos and rio Tramandaí basins by the presence of two vertically elongated humeral spots, the anterior humeral spot with the upper portion wider than the lower portion and slightly directed forward, 37-39 perforated scales along the lateral line, 14 scale rows around caudal peduncle, 2-4 maxillary tricuspid teeth, 24-28 branched anal-fin rays, bony hooks on all fins of mature males, and conspicuous caudal peduncle spot. Furthermore, the new species differs from its congeners by body depth (37.9-45.9% of standard length), preanal distance (62.4-69.1% of SL), anal-fin base length (29.7-35.6% of SL), and orbital diameter (29.5-38.2% of head length). © 2015 Sociedade Brasileira de Ictiologia.

Ibanez A.L.,Metropolitan Autonomous University | Gonzalez-Castro M.,Laboratorio Of Ictiologia | Pacheco-Almanzar E.,Metropolitan Autonomous University
Journal of Fish Biology | Year: 2011

This study gives the first record of Mugil hospes distributed in the Gulf of Mexico. This species previously has been confused with its congener Mugil curema and can be easily differentiated by the shape of the ctenii on their scales. © 2011 The Authors. Journal of Fish Biology © 2011 The Fisheries Society of the British Isles.

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.

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