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| Almeida,Ana Paula Gottlieb; Zardo,Everton Luis; Toni,Candida; Behr,Everton Rodolfo; Silva,Leila Picolli da; Vieira,João Paes; Loro,Vania Lúcia; Baldisserotto,Bernardo. |
| ABSTRACT The aim of this study was to determine the composition of gastrointestinal content and protease and lipase activities in summer and winter as well as to evaluate the relationship between digestive enzyme activity and centesimal composition of gastrointestinal content and feeding habits of two omnivorous species, Rhamdia quelen (Quoy & Gaimard, 1824) and Pimelodus maculatus (LaCèpede, 1803), and of two detritivorous species, Loricariichthys anus (Valenciennes, 1835) and Hypostomus commersoni (Valenciennes, 1836). The activities of pepsin, trypsin, chymotrypsin, and lipase, and the levels of proteins and lipids in the gastrointestinal tract, were evaluated. The enzyme activities were not related to the centesimal composition of gastrointestinal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chymotrypsin; Fish; Lipase; Pepsin; Trypsin. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100322 |
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| Lombardi,Pryscilla Moura; Rodrigues,Fábio Lameiro; Vieira,João Paes. |
| The aim of this study was to compare the influence of different haul distances of a codend beach seine on the catchability of fish in a surf zone. Two different surf zone sites (A and B) at the Cassino Beach (Rio Grande do Sul, Brazil) were sampled at three different distances, parallel to the beach (30, 60, and 90 m). Starting 40 m from the beach line, diagonal distances of approximately 50, 70, and 100 m were swept. The total CPUE and CPUA haul distances are compatible with a declining trend in catch rates with increased haul distance at both sites. However, statistically significant differences were observed only for the short distance CPUA (50 m) in relation to the other haul distances at one of the sites sampled. Two fish size groups were observed (TL... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish abundance; Fish size; Sampling gears; Surf zone. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100005 |
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| Ceni,Gianfranco; Vieira,João Paes. |
| The present study compares fish species composition, dominance, and size-structure patterns at an open sand beach area (32°15'S, 52°46'W) in Mirim Lake, RS, Brazil, estimated from samples collected with two distinct beach seine nets. The BS-9m net is 9 m long and 1.5 m high, and is made with a 5 mm multifilament mesh on its central portion and 12 mm on the side wings. The BS-30m net is 30 m long and 1.8 m high, with a 12 mm monofilament nylon mesh all over the net, except for a 30 cm strip made with a 12 mm multifilament mesh on the lower portion. Thirty hauls were performed with both nets resulting in a total of 849 fish captured, comprising 34 species. BS-9m was selective for individuals smaller than 60 mm TL and BS-30m for individuals larger than 60 mm... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Freshwater; Gear; Littoral zone; Sampler comparison. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000500005 |
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| Loebmann,Daniel; Vieira,João Paes. |
| Este trabalho avaliou do impacto da pesca do camarão-rosa Farfantepenaeus paulensis (Perez-Farfante, 1967) sobre a assembléia de peixes e crustáceos do Parque Nacional da Lagoa do Peixe. Constatou-se que, em média, a composição nas capturas da pesca do camarão-rosa, com a arte de pesca aviãozinho, é semelhantes àquelas descrita em para outros estuários do Rio Grande do Sul, quando considerada apenas a proporção das grandes categorias analisadas (espécie alvo - camarão-rosa 53%: captura acessória 24%: rejeito 23%). A composição da fauna acompanhante (captura acessória + rejeito) apresente diferenças pronunciadas ao longo do gradiente salino da laguna. No geral, ao nível específico, as espécies de peixes capturadas com maior intensidade - Brevoortia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brevoortia pectinata; Estuários; Micropogonias furnieri; Manejo de unidades de conservação; Rejeito de pesca. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000400006 |
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| Becker,Alexssandro Geferson; Gonçalves,Jamile Fabbrin; Toledo,Jaderson dos Anjos; Burns,Marcelo D. M.; Garcia,Luciano de Oliveira; Vieira,João Paes; Baldisserotto,Bernardo. |
| The purpose of this study was to investigate Na+, Cl-, K+, Ca2+, and Mg2+ levels in the plasma of freshwater and marine/estuarine teleosts collected at different salinities (0 to 34) from the estuarine and freshwater portions of the São Gonçalo channel in Southern Brazil. Any relationship between plasma ion levels and salinity and the capacity of ionic regulation of teleosts found at three or more different salinities (Genidens barbus and Micropogonias furnieri) was also investigated. Results showed no relationship between plasma ion levels and salinity when considering all species together, but the two species collected from three or more different salinities showed a significant positive relationship between plasma ion levels and salinity, indicating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ariidae; Estuaries; Ionoregulation; Osmoregulation; Salinity; Sciaenidae. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400021 |
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| Lima,Mauro Sergio Pinheiro; Vieira,João Paes. |
| This study analyzes the spatiotemporal variation of the ichthyofauna of the surf zone of Praia do Cassino, municipality of Rio Grande (state of Rio Grande do Sul, Brazil) from October 2005 to September 2006. Fishes were collected monthly and during daytime using a large beach seine net (30 m x 1.8 m, with 12 mm uniform mesh manufactured with monofilament nylon wire). Five hauls were conducted on each of three sampling sites: one near the jetties of Patos Lagoon and two located 5 km and 10 km south from the jetties, respectively. We caught 10,066 fishes, weighting 128,486 g, distributed in 37 species belonging to 18 families that are similar in species composition to the dominant fish fauna - Trachinotus marginatus (Cuvier, 1832), Atherinella brasiliensis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beach seine; Fish community; Dominant species; Multivaried analysis; Wave exposition. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300014 |
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