scholarly journals A case of complete albinism in the catfish Cambeva guareiensis (Siluriformes: Trichomycteridae)

2020 ◽  
Vol 20 (4) ◽  
Author(s):  
Valter M. Azevedo-Santos ◽  
Fernando M. Pelicice ◽  
Ivan Sazima ◽  
Raoul Henry
Keyword(s):  
River Basin ◽  
Freshwater Fishes ◽  
Color Pattern ◽  
Paraná River ◽  
Southeastern Brazil ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

Abstract: Albinism has been recorded in Neotropical freshwater fishes, mostly for nocturnal or cryptobiotic species. We report herein a case of albinism in the catfish Cambeva guareiensis (Trichomycteridae) from the Guareí River basin, Upper Paraná River basin, southeastern Brazil. The albino fish was caught with seven individuals with typical color pattern of the species. The features of the albino fish in life and shortly after preservation are described and illustrated.

scholarly journals Length-weight relationships of four fish species from the upper Paraná River basin, Southeastern Brazil

2017 ◽  
Vol 34 (1) ◽  
pp. 237-239 ◽  
Author(s):  
V. M. Azevedo-Santos ◽  
P. N. Coelho ◽  
E. M. Brambilla ◽  
F. P. Lima ◽  
A. B. Nobile ◽  
...  
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Paraná River ◽  
Southeastern Brazil ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

scholarly journals Evidence of the color pattern variation in populations of Gymnotus pantanal (Gymnotiformes) from three streams in the upper Paraná River basin, Brazil

2011 ◽  
Vol 9 (2) ◽  
pp. 343-350
Author(s):  
Vitor André Frana ◽  
Weferson Júnio da Graça ◽  
Éder André Gubiani ◽  
Jocicléia Thums Konerat ◽  
Vladimir Pavan Margarido
Keyword(s):  
River Basin ◽  
Color Pattern ◽  
Paraná River ◽  
Color Variation ◽  
Parana River ◽  
Cytogenetic Data ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Important Character ◽  
Paraná River Basin

Color pattern is an important character in the systematics and alpha-taxonomy of electric fishes of the genus Gymnotus. This paper presents evidence of color variation in populations of G. pantanal found in the streams Jacutinga and Pinheirinho, in the upper Paraná River basin, southern Brazil. Color variations were corroborated for morphological and cytogenetic data. Our results show the importance of integrating morphologic and cytogenetic data in the taxonomy of the Gymnotus species.

scholarly journals Activity and habitat use of two species of stingrays (Myliobatiformes: Potamotrygonidae) in the upper Paraná River basin, Southeastern Brazil

2012 ◽  
Vol 10 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Domingos Garrone Neto ◽  
Virgínia Sanches Uieda
Keyword(s):  
Habitat Use ◽  
River Basin ◽  
Habitat Diversity ◽  
Sandy Beaches ◽  
Paraná River ◽  
Southeastern Brazil ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

The life history of freshwater stingrays (Potamotrygonidae) under natural conditions has been poorly documented. In this study, we investigated theperiod of activity and the habitat use of two species of the genus Potamotrygon in the upper Paraná River basin, Southeastern Brazil. Potamotrygon falkneri and P. motoro are similar to each other as far as the analyzed behavior is concerned. Individuals of both species segregate according to their size, and in function of the depth and period of the day. Younger individuals inhabit mostly sandy beaches and places that are no deeper than four meters throughout the whole day. Bigger stingrays realize bathymetric migrations, alternating their position between places deeper than eight meters during the day, and shallow areas at night. Individuals of intermediate size inhabit transition environments that have greater habitat diversity. Both species presented mostly nocturnal habits, especially regarding their feeding behavior. The behavioral patterns observed seem to go through ontogenetic variations and probably change throughout the year, between dry and wet seasons.

scholarly journals Ichthyofauna of two streams (silted and reference) in the Upper Paraná river basin, Southeastern Brazil

2004 ◽  
Vol 64 (4) ◽  
pp. 757-765 ◽  
Author(s):  
L. Casatti
Keyword(s):  
River Basin ◽  
Dominant Species ◽  
Fish Assemblages ◽  
Paraná River ◽  
Southeastern Brazil ◽  
Riparian Management ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

In this study the fish assemblages of the silted Águas Claras stream (AC) was compared with that of a reference, the São Carlos stream (SC), so as to identify potential fish indicators of integrity or degradation. Both streams, located about 5 km from one another, are part of the Upper Paraná river basin, Brazil, and present similar physiographical features. Twenty-one species were collected in AC (1,271 specimens) and 18 in SC (940 specimens). In AC, dominant species e.g., Corydoras aeneus (sandy pools), Serrapinnus notomelas, and Pyrrhulina australis (warm marginal shallow pools) were those favored by new microhabitats linked to siltation and removal of the riparian vegetation. Changes in the composition of the marginal vegetation resulted in dominance of species such as Hisonotus francirochai (marginal grasses). In SC the dominant species was Phalloceros caudimacultus, abundant in marginal shallow pools, and Trichomycterus diabolus. and Hypostomus nigromaculatus, exclusively riffle-dwelling species, which were absent in AC. Fish assemblage monitoring is recommended for use in riparian management programs in order to evaluate negative instream sedimentation effects.

scholarly journals Population aspects of Bryconamericus stramineus in streams of the upper Paraná River basin, Brazil

2011 ◽  
Vol 11 (2) ◽  
pp. 55-62 ◽  
Author(s):  
Lilian Paula Vasconcelos ◽  
Yzel Rondon Súarez ◽  
Sidnei Eduardo Lima-Junior
Keyword(s):  
River Basin ◽  
Paraná River ◽  
Ovary Development ◽  
Recruitment Pattern ◽  
Growth Coefficient ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Sexually Mature ◽  
Paraná River Basin

In order to describe some aspects of the population ecology of Bryconamericus stramineus in the Guiraí River basin, upper Paraná River basin, samples were taken bimonthly from October 2006 to August 2007 at seven sites in the basin. A total of 960 individuals, including 532 females, 316 males, and 112 of undetermined sex, were collected. A significant variation in the sex ratio was observed (Χ2 = 32.82; p < 0.001). Females were larger (59.7 mm) than males (58.9 mm); however, males showed a larger angular growth coefficient (b) than females. It was estimated that 50% of females were sexually mature at 36.4 mm. The highest rate of ovary development was observed in October, while in June 2007 no mature females were found. Mean fecundity was estimated at 313 eggs, and the relative fecundity was 184.6 eggs/g. The asymptotic was estimated at 62.8 mm and the growth rate at 0.76. The growth performance index was calculated at 3.47, the longevity at 3.94 years and the mortality (M) at 1.18 years. The recruitment pattern of the species showed peaks concentrated in periods of low rainfall.

Chromosomal characteristics of rDNA in a conserved karyotype of two Sternopygus macrurus (Gymnotiformes: Sternopygidae) populations from upper Paraná River basin

Biologia ◽  
2017 ◽  
Vol 72 (6) ◽  
Author(s):  
Carlos Alexandre Fernandes ◽  
Lucas Baumgärtner ◽  
Leonardo Marcel Paiz ◽  
Vladimir Pavan Margarido ◽  
Ana Luiza de Brito Portela-Castro
Keyword(s):  
River Basin ◽  
Paraná River ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

AbstractKaryotype and chromosomal characteristics of both minor and major rDNA of

scholarly journals New record of planktonic cladoceran to the upper Paraná River, Brazil: Bosmina huaroensis Delachaux, 1918

2000 ◽  
Vol 60 (4) ◽  
pp. 633-636 ◽  
Author(s):  
L. F. M. VELHO ◽  
F. A. LANSAC-TÔHA ◽  
C. C. BONECKER
Keyword(s):  
River Basin ◽  
New Record ◽  
First Record ◽  
Paraná River ◽  
Parana River ◽  
First Occurrence ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

In this paper we register the first occurrence of Bosmina huaroensis Delachaux, 1918 in the upper Paraná River basin, which is probably the first record to Brazil. Illustrations and an updated description of the species are given.

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