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Age and growth of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae) in southern Brazil Neotropical Ichthyology
Carmo,Wanessa P. D.; Fávaro,Luís Fernando; Coelho,Rui.
ABSTRACT Age and growth studies are fundamental to successful fisheries management. Zapteryx brevirostris (Müller & Henle, 1841) is distributed off the Brazilian continental shelf and this species is assessed as “Vulnerable” in the Red List of the International Union for the Conservation of Nature (IUCN). Thus, the objective of this study was to present previously unknown information about the age and growth of Z. brevirostris that can be used for its management, conservation, and fisheries. A total of 162 specimens were sampled, with total lengths (TL) varying between 35.7 cm and 56 cm. The vertebrae were embedded in resin, sectioned in cuts with 0.5 mm thickness and the growth bands of the vertebrae were read under a light microscope. In the studied...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Back-calculation; Conservation; Growth rate; K value; Von Bertalanffy curves (VBGF).
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100210
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Environmental influences on the spatial and temporal distribution of the puffer fish Sphoeroides greeleyi and Sphoeroides testudineus in a Brazilian subtropical estuary Neotropical Ichthyology
Fávaro,Luís Fernando; Oliveira,Elton Celton de; Ventura,Augusto de Oliveira Brunow; Verani,Nelsy Fenerich.
The spatial and temporal distribution of Sphoeroides greeleyi and Sphoeroides testudineus were established from collections (biological material and environmental data) conducted on a monthly basis from May 2000 to April 2001 in intertidal areas along the north-south axis of the estuarine complex of Paranaguá, Paraná State. In addition to characterizing a north-south spatial gradient, which fluctuates seasonally, the variation in the abiotic factors made possible the division of the estuary into three regions: north, central and south. Spatially, it was found that the number of individuals declines significantly for both species in the north-south direction of the estuary. Moreover, significant differences were found in the size of individuals across the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tetraodontidae; Estuarine-residents; Closely related species; Abundance; Length structure.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200020
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Ontogenetic and sexual variation in the sagitta otolith of Menticirrhus americanus (Teleostei; Sciaenidae) (Linnaeus, 1758) in a subtropical environment Pap. Avulsos de Zool. (São Paulo)
Carvalho,Barbara Maichak de; Volpedo,Alejandra Vanina; Fávaro,Luís Fernando.
Abstract This study aimed to verify variations in the form of the sagitta otolith of Menticirrhus americanus as to their ontogeny, sex and stage of such structure. Ontogenetically were found significant differences (p < 0.05) for all shape indices (aspect ratios, shape factor, rectangularity, ellipticity, relative surface of sulcus acusticus) and also in the wavelet of the otolith. The CVA presented a 98.6% correct reclassification of the otolith between interval class. Sexual variations were found in the wavelet and in the relative surface of sulcus acusticus index. Between adult females and young females, differences were not detected in the wavelet and rectangularity, but significant differences were found in all other shape indices. The CVA...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dimorphism; Otolith; Shape indices; Stage of life; Wavelet.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492020000100209
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Reproduction of the flatfish Achirus lineatus (Pleuronectiformes: Achiridae) in Paranaguá Bay, state of Paraná, a subtropical region of Brazil Rev. Bras. Zool.
Oliveira,Elton C. de; Fávaro,Luís Fernando.
The present study characterizes the oogenesis and the ovarian maturation scale, and determines the reproductive period, type of spawning, recruitment period, and population variations in the reproductive process of the flatfish Achirus lineatus (Linnaeus, 1758). Specimens were sampled on a monthly basis in the shallow near shore area of the Paranaguá Bay, state of Paraná, Brazil, from March 2006 to February 2007. The specimens collected were measured for morphometric data (total length and total weight) and their gonads were exposed for macroscopic evaluation. The gonads were subsequently removed, weighed and processed for microscopic analyses. Six phases of the ovarian follicle development were defined, as well as five ovarian development stages. Growth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oogenesis; Maturity scale; Reproductive period; Type of spawning; Sex ratio.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000400004
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Reproductive tactics used by the Lambari Astyanax aff. fasciatus in three water supply reservoirs in the same geographic region of the upper Iguaçu River Neotropical Ichthyology
Silva,Juliano Pilotto Abelardino da; Muelbert,Adriane Esquivel; Oliveira,Elton Celton de; Fávaro,Luís Fernando.
The species Astyanax aff. fasciatus was investigated as regards differences in reproductive tactics in three reservoirs with different ages (Iraí, Piraquara and Passaúna) located in the same geographic region. The biological material was obtained through monthly collections carried out from july/2006 to june/2007. The average value of the gonadosomatic index (GSI) in Passaúna reservoir was significantly higher in relation to the values obtained in the other reservoirs. Spawning was total in Iraí reservoir and partial in the others. Allometric growth of the species was negative in Iraí reservoir and positive in the others. The highest condition factor value was estimated in Iraí reservoir, followed by Piraquara and Passaúna reservoirs, respectively. Females...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characidae; Succession; Spawning; Condition factors; Sex ratio.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400019
Registros recuperados: 5
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