Length‐weight relationships of four fish species from the Tucuruí Lake Conservation Units Mosaic, Tocantins River Basin, Amazon, Brazil

Over the last 20 years several projects carried on the Madeira River basin in the Amazon produced a great amount data on total Hg concentration in different fish species. In this paper we discuss temporal trends in Hg contamination and its relation to body weight in some of those fishes, showing that even within similar groups, such as carnivorous and non-migratory fish, the interspecies variability in Hg accumulation is considerable.

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COMMERCIAL FAUNA OF WA-TERBODIES IN THE MOSCOW RIVER BASIN IN THE SECOND HALF OF THE 18th CENTURY

Transactions of Papanin Institute for Biology of Inland Waters RAS ◽

10.47021/0320-3557-2021-94-112 ◽

2021 ◽

pp. 94-112

Author(s):

N. Ozerova

Keyword(s):

River Basin ◽

Fish Species ◽

18Th Century ◽

Commercial Fish ◽

Acipenser Ruthenus ◽

Land Survey ◽

Ancient Times ◽

In The Beginning ◽

Almost All ◽

Moscow River

Based on the data from economic notes to the General Land Survey, the ranges of commercial fish and crayfish species that inhabited waterbodies of the Moscow River basin in the second half of the 18th century are reconstructed. Eighteen maps showing the distribution of 22 fish species, including Acipenser ruthenus L., Abramis brama L., Barbatula barbatula L., Lota lota L., Sander lucioperca L. and others are compiled. Comparison of commercial fish species that lived in the Moscow River basin in the second half of the 18th century with data from ichthyological studies in the beginning of the XXI century and materials of archaeological surveys shows that almost all of these species have lived in the Moscow River basin since ancient times and have survived to the present day.

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Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil

Neotropical Ichthyology ◽

10.1590/s1679-62252007000400007 ◽

2007 ◽

Vol 5 (4) ◽

pp. 479-484 ◽

Cited By ~ 4

Author(s):

Andréa L. Neuberger ◽

Elineide E. Marques ◽

Carlos S. Agostinho ◽

Rafael J. de Oliveira

Keyword(s):

River Basin ◽

Reproductive Biology ◽

Mean Value ◽

Reproductive Period ◽

Total Weight ◽

Individual Female ◽

Relative Fecundity ◽

Mean Diameter ◽

Tocantins River ◽

The Individual

In order to evaluate aspects of the reproductive biology of Rhaphiodon vulpinus in the Upper and Middle Tocantins River, samples were taken monthly from October, 1999 through September, 2001, by means of gill nets. Males, which were more abundant than females (chi2 146.87: df=1: p<0.05), matured at a smaller size. The reproductive period of the species extended essentially from November through January, with a peak of activity in November. Fecundity, with an estimated mean value of 98,185 oocytes, varied from 38,177 to 215,841 oocytes, and it did not correlate with the length of the individual female analyzed (r=0.4663: p=0.206). Relative fecundity was 130.6 oocytes/g total weight. Mature oocytes had a mean diameter of 0.98 mm, corresponding to a volume of 0.50 mm³.

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Analysis of evapotranspiration and biomass in pastures with degradation indicatives in the Upper Tocantins River Basin, in Brazilian Savanna

Revista CERES ◽

10.1590/0034-737x201663060002 ◽

2016 ◽

Vol 63 (6) ◽

pp. 754-760 ◽

Cited By ~ 4

Author(s):

Ricardo Guimarães Andrade ◽

Antônio Heriberto de Castro Teixeira ◽

Janice Freitas Leivas ◽

Sandra Furlan Nogueira

Keyword(s):

River Basin ◽

Large Scale ◽

Meteorological Data ◽

Simple Algorithm ◽

Production Potential ◽

Pasture Degradation ◽

Ndvi Time Series ◽

Tocantins River ◽

Remote Sensing Techniques ◽

Degraded Pastures

ABSTRACT The objective of this study was to apply the Simple Algorithm For Evapotranspiration Retrieving (SAFER) with MODIS images together with meteorological data to analyze evapotranspiration (ET) and biomass production (BIO) according to indicative classes of pasture degradation in Upper Tocantins River Basin. Indicative classes of degraded pastures were obtained from the NDVI time-series (2002-2012). To estimate ET and BIO in each class, MODIS images and data from meteorological stations of the year 2012 were used. The results show that compared to not-degraded pastures, ET and BIO were different in pastures with moderate to strong degradation, mainly during water stress period. Therefore, changes in energy balance partition may occur according to the degradation levels, considering that those indicatives of degradation processes were identified in 24% of the planted pasture areas. In this context, ET and BIO estimates using remote sensing techniques can be a reliable indicator of forage availability, and large-scale aspects related to the degradation of pastures. It is expected that this knowledge may contribute to initiatives of public policies aimed at controlling the loss of production potential of pasture areas in the Upper Tocantins River Basin in the state of Goiás, Brazil.

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Gene mapping of 5S rDNA sites in eight fish species from the Paraíba do Sul river basin, Brazil

Cytogenetic and Genome Research ◽

10.1159/000078567 ◽

2004 ◽

Vol 106 (1) ◽

pp. 107-110 ◽

Cited By ~ 47

Author(s):

K.F. Kavalco ◽

R. Pazza ◽

L.A.C. Bertollo ◽

O. Moreira-Filho

Keyword(s):

Gene Mapping ◽

River Basin ◽

Fish Species ◽

5S Rdna ◽

Rdna Sites ◽

Paraíba Do Sul River

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Morphological differentiation among migratory fish species from the Paraná River basin

Biota Neotropica ◽

10.1590/s1676-06032012000400003 ◽

2012 ◽

Vol 12 (4) ◽

pp. 41-49 ◽

Cited By ~ 2

Author(s):

Lucileine de Assumpção ◽

Maristela Cavicchioli Makrakis ◽

Sergio Makrakis ◽

Pitágoras Augusto Piana ◽

Patrícia Sarai da Silva ◽

...

Keyword(s):

River Basin ◽

Fish Species ◽

Fish Passage ◽

Paraná River ◽

Migratory Fish ◽

Migratory Species ◽

Caudal Peduncle ◽

Parana River ◽

Maximum Body ◽

Paraná River Basin

This study characterized the morphological differences among migratory fish species from the Paraná River Basin. A total of 177 adult fish of Leporinus elongatus, Leporinus macrocephalus, Prochilodus lineatus, Salminus brasiliensis, Pimelodus maculatus, Pinirampus pirinampu, Pseudoplatystoma corruscans, Pterodoras granulosus, and Rhaphiodon vulpinus were sampled in the Canal da Piracema, a fish passage system at Itaipu Dam, Paraná River. The migratory species were analyzed through 22 morphometric measurements and fineness ratio to identify morphological patterns related to swimming performance. Four species groups were indicated by the Cluster analysis: I) R. vulpinus; II) P. corruscans; III) L. macrocephalus, L. elongatus, P. lineatus, P. maculatus, and S. brasiliensis - measurements of head height and anal fin length formed this group; and IV) P. granulosus and P. pirinampu - measurements of maximum body width and caudal peduncle width contributed to form this group. The morphometric variables that most contributed to the distinction were head length and mouth width for groups I and II. The species R. vulpinus and P. granulosus differed from other species, showing fineness ratios of 9.4 and 3.7, respectively. Leporinus elongatus, L. macrocephalus, P. lineatus, P. maculatus, and S. brasiliensis showed significant differences from other species, with ratios ranging from 4.57 to 5.19, indicating that these species may be better swimmers. Long-distance migratory species using the Piracema Canal to ascend upstream areas differed morphologically, morphological characteristics such as a narrow caudal peduncle and maximum body length, besides to the values of the fineness ratio, were essential to differentiate the migratory species.

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