BIOLOGY OF MANDI (Pimelodus maculatus) IMMEDIATELY DOWNSTREAM OF HYDROPOWER PLANTS OF SOUTHEASTERN BRAZIL

We determined in this study the habitat preferences of seven native fish species in a regulated river in Southeastern Brazil. We tested the hypothesis that fishes differ in habitat preference and that they use stretches of the river differing in hydraulic characteristics and substrate type. We surveyed fishes in four 1-km long river stretches encompassing different habitat traits, where we also measured water depth, velocity, and substrate type. We investigated preference patterns of four Siluriformes (Loricariichthys castaneus, Hoplosternum littorale, Pimelodus maculatus, and Trachelyopterus striatulus) and three Characiformes (Astyanax aff. bimaculatus, Oligosarcus hepsetus, and Hoplias malabaricus), representing approximately 70% of the total number of fishes and 64% of the total biomass. We classified fishes into four habitat guilds: (1) a slow-flowing water guild that occupied mud-sand substrate, composed of two Siluriformes in either shallow (< 4 m, i.e., H. littorale) or deep (> 8 m, L. castaneus) waters; (2) a run-dwelling guild that occurs in deep backwaters with clay-mud substrate, composed of the Characiformes A. aff. bimaculatus and O. hepsetus; (3) a run-dwelling guild that occurs in sandy and shallow substrate, composed of T. striatulus; and (4) a fast-flowing guild that occurs primarily along shorelines with shallow mud bottoms, composed of H. malabaricus and P. maculatus. Our hypothesis was confirmed, as different habitat preferences by fishes appear to occur in this regulated river.

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Risk Assessment of Fish Death at Hydropower Plants in Southeastern Brazil

10.5935/978-85-87929-62-4.2016.1 ◽

2016 ◽

Author(s):

Raquel Coelho Loures ◽

Alexandre Lima Godinho

Keyword(s):

Risk Assessment ◽

Southeastern Brazil ◽

Hydropower Plants

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FISH AFFECTED BY OPERATIONAL PROCEDURES OF HYDROPOWER PLANTS IN SOUTHEASTERN BRAZIL

Risk Assessment of Fish Death at Hydropower Plants in Southeastern Brazil ◽

10.5935/978-85-87929-62-4.2016.4 ◽

2016 ◽

Author(s):

ANA CAROLINA LACERDA RÊGO ◽

IVO GAVIÃO PRADO ◽

THIAGO TEIXEIRA SILVA ◽

RAQUEL COELHO LOURES ◽

RICARDO JOSÉ DA SILVA ◽

...

Keyword(s):

Southeastern Brazil ◽

Hydropower Plants

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Biomarkers and bioindicators of the environmental condition using a fish species (Pimelodus maculatus Lacepède, 1803) in a tropical reservoir in Southeastern Brazil

Brazilian Journal of Biology ◽

10.1590/1519-6984.167209 ◽

2017 ◽

Vol 78 (2) ◽

pp. 351-359 ◽

Cited By ~ 9

Author(s):

F. G. Araújo ◽

C. N. Morado ◽

T. T. E. Parente ◽

F. J. R Paumgartten ◽

I. D. Gomes

Keyword(s):

Fish Species ◽

Hydroelectric Plant ◽

Gonadosomatic Index ◽

Erod Activity ◽

Southeastern Brazil ◽

Hepatosomatic Index ◽

Environmental Condition ◽

Tropical Reservoir ◽

Pimelodus Maculatus ◽

Paraíba Do Sul River

Abstract The Funil Reservoir receives a large amount of xenobiotics from the Paraíba do Sul River (PSR) from large number of industries and municipalities in the watershed. This study aimed to assess environmental quality along the longitudinal profile of the Paraíba do Sul River–Funil Reservoir system, by using biomarkers and bioindicators in a selected fish species. The raised hypothesis is that Funil Reservoir acts as a filter for the xenobiotics of the PSR waters, improving river water quality downstream the dam. Two biomarkers, the ethoxyresorufin–O–deethylase activity (EROD), measured as fluorimetricly in S9 hepatic fraction, and the micronuclei frequency (MN), observed in erythrocytes of the cytoplasm, and three bioindicators, the hepatosomatic index (HSI), gonadosomatic index (GSI) and condition factor (CF) were used in Pimelodus maculatus, a fish species widely distributed in the system. Four zones were searched through a longitudinal gradient: 1, river upstream from the reservoir; 2, upper reservoir; 3, lower reservoir; 4, river downstream of the reservoir. EROD activity and HSI and GSI had significant differences among the zones (P<0.05). The upper reservoir had the lowest EROD activity and HSI, whereas the river downstream of the reservoir had the highest EROD and lowest GSI. The river upstream from the reservoir showed the highest HSI and GSI. It is suggested that the lowest environmental condition occur at the river downstream of the reservoir, where it seems to occur more influence of xenobiotics, which could be associated with hydroelectric plant operation. The hypothesis that Funil reservoir acts as a filter decanting pollution from the Paraíba do Sul River waters was rejected. These results are novel information on this subject for a native fish species and could be useful for future comparisons with other environments.

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New morphological data on Cucullanus pinnai pinnai (Nematoda) parasitizing Pimelodus maculatus (Pimelodidae) in southeastern Brazil

Revista Brasileira de Parasitologia Veterinária ◽

10.1590/s1984-29612015028 ◽

2015 ◽

Vol 24 (2) ◽

pp. 155-161

Author(s):

Vivian Suane de Freitas Vieira ◽

Fabiano Matos Vieira ◽

José Luis Luque

Keyword(s):

Morphological Data ◽

Southeastern Brazil ◽

Differential Interference Contrast ◽

Genetic Studies ◽

Morphological Variations ◽

Wide Geographical Distribution ◽

Large Numbers ◽

Pimelodus Maculatus ◽

Dic Microscopy ◽

Scanning Electron

This paper describes the morphology of Cucullanus pinnai pinnai parasitizing Pimelodus maculatus in the Guandu River, Brazil, based on differential interference contrast (DIC) microscopy and scanning electron microscopy (SEM), providing new morphological data about this species of parasite. Nematodes were collected between May and October 2012 from specimens of Pimelodus maculatus in the Guandu River (22°48’2”S, 43°37’35”W), in the state of Rio de Janeiro, Brazil. Some characteristics of specimens of Cucullanus in this study fall within the range of morphological variations of previously studied C. pinnai pinnai. Most of the specimens studied here had excretory pore and deirids located at the posterior end of the oesophagus, a feature not recorded in previous studies of this species. In addition, the size of the gubernaculum was larger than the other specimens previously studied. The SEM and DIC analyses of C. pinnai revealed several morphological details of the cephalic region and the tail papillae. With regard to the polymorphism of C. pinnai, morphological and genetic studies of this cucullanid nematode are needed, involving large numbers of host species and a wide geographical distribution.

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Modeling cetacean habitat use in an urban coastal area in southeastern Brazil

Marine Ecology Progress Series ◽

10.3354/meps13313 ◽

2020 ◽

Vol 642 ◽

pp. 227-240

Author(s):

L Lodi ◽

R Tardin ◽

G Maricato

Keyword(s):

Habitat Use ◽

Protected Areas ◽

Linear Models ◽

Anthropogenic Activities ◽

Buffer Zone ◽

Humpback Whales ◽

Southeastern Brazil ◽

Major Influence ◽

Cetacean Species ◽

Few Data

Most studies of cetacean habitat use do not consider the influence of anthropogenic activities. We investigated the influence of environmental and anthropogenic variables on habitat use by humpback Megaptera novaeangliae and Bryde’s whales Balaenoptera brydei off the coast of the Brazilian city of Rio de Janeiro. Although there are 2 marine protected areas (MPAs) in this area, few data are available on cetacean habitat use or on the overlap of different cetacean species within these MPAs. Our aim was to evaluate the effectiveness of the MPAs and propose a buffer zone to better protect the biodiversity of the study area. We conducted systematic surveys and developed spatial eigenvector generalized linear models to characterize habitat use by the species in the study area. Habitat use by humpback whales was influenced only by depth, whereas for Bryde’s whales there was the additional influence of anthropogenic variables. For Bryde’s whales, which use the area for feeding, sea surface temperature and the distance to anchorages had a major influence on habitat use. We also showed that neither of the MPAs in the study area adequately protects the hotspots of either whale species. Most of the humpback whale grid cells with high sighting predictions were located within 2 km of the MPAs, while areas of high sighting prediction of Bryde’s whales were located up to 5 km from the MPAs, closer to beaches. Our findings provide important insights for the delimitation of protected areas and zoning of the MPAs.

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