Cytogenetic analyses of two endemic fish species from the São Francisco River basin: Conorhynchus conirostris and Lophiosilurus alexandri (Siluriformes)

Abstract: Freshwater ichthyofauna from Brazil Northeast region was considered as being poorly known until recent years, with a considerable number of publications becoming available in the last decade. The present study provides an inventory of freshwater fish species from the Paraíba do Norte River basin located in Paraíba State, Brazil. This inventory is intended to contribute to the of knowledge to the regional fish diversity, pre-transposition of the São Francisco River. Collecting data was obtained from ichthyological databases of both national and foreign institutions. A total of 47 freshwater fish species are registered within the Paraíba do Norte River basin, represented by 38 genera, 20 families and six orders. Characiformes, comprising 47% (22 species), Cichliformes, and Siluriformes are among the most representative orders, 19% (9 species) each, of total recorded species. Seven species of Cichliformes are reported as introduced species in this basin. Cyprinodontiformes and Gobiiformes also registered in this region and correspond to 5% (two species) and Gymnotiformes, Perciformes and Synbranchiformes, 2% (one species each) of total recorded species. Paraíba do Norte River basin stands out in the current national scenario as it comprises the first region from the Mid-Northeastern Caatinga freshwater ecoregion to receive water from the transposition of the São Francisco River. The current inventory is important as it provides scientific data related to the ichthyofauna of Paraíba do Norte River basin prior to the commencement of the river transposition process. An identification key is also given for the freshwater fish species of the region.

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Evaluation of the effects of pressure gradients on four Brazilian freshwater fish species

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132009000100015 ◽

2009 ◽

Vol 52 (1) ◽

pp. 111-118 ◽

Cited By ~ 7

Author(s):

Paulo dos Santos Pompeu ◽

Luiz Felipe Mascarenhas Horta ◽

Carlos Barreira Martinez

Keyword(s):

Freshwater Fish ◽

River Basin ◽

Fish Species ◽

Gradual Increase ◽

Mortality Rates ◽

Pressure Gradients ◽

Freshwater Fish Species ◽

Sao Francisco River ◽

São Francisco River

This work aimed to experimentally evaluate the behavior of Brazilian freshwater fish species when submitted to a gradual increase in pressure, as well as sudden decompression's effects simulating the passage through a hydroelectric turbine. Four species from the São Francisco river basin were tested: Astyanax bimaculatus, Hypostomus sp., Leporinus reinhardti and Prochilodus costatus. For all of them mortality rates due to decompression were extremely low. However, the symptoms related to decompression, such as bulged eyes and hemorrhage, were not observed only in Hypostomus sp., and were more frequent the larger the pressure values were, considering the values from which decompression was performed. All these symptoms decreased significantly after 24 h of observation. With the increase in pressure inside the apparatus, the four tested species moved towards the upper levels. This behavior could make possoble the implementation of bypass downstream fish passages in dams constructed in Brazil.

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Comparative analysis of gonadal morphology in six fish species of the Incertae Sedis genera in Characidae of occurrence in the São Francisco River Basin, Brazil

Acta Zoologica ◽

10.1111/j.1463-6395.2010.00478.x ◽

2010 ◽

Vol 93 (1) ◽

pp. 48-56 ◽

Cited By ~ 14

Author(s):

Yuri Simões Martins ◽

Fábio Pereira Arantes ◽

Yoshimi Sato ◽

José Enemir dos Santos ◽

Elizete Rizzo ◽

...

Keyword(s):

Comparative Analysis ◽

River Basin ◽

Fish Species ◽

Sao Francisco River ◽

Incertae Sedis ◽

São Francisco River

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Length-weight relationships for five endemic fish species in the upper Yangtze River basin, China

Journal of Applied Ichthyology ◽

10.1111/jai.12824 ◽

2015 ◽

Vol 31 (5) ◽

pp. 961-962

Author(s):

L. Li ◽

H. Du ◽

L. Ren ◽

J.M. Wu ◽

Q.W. Wei

Keyword(s):

River Basin ◽

Fish Species ◽

Yangtze River ◽

Yangtze River Basin ◽

Upper Yangtze River ◽

Endemic Fish ◽

The Upper Yangtze River

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Induced reproduction and reproductive characteristics of Rhinelepis aspera Agassiz, 1829 (osteichthyes: Siluriformes, Loricariidae)

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89131998000300006 ◽

1998 ◽

Vol 41 (3) ◽

pp. 309-314 ◽

Cited By ~ 9

Author(s):

Yoshimi Sato ◽

Nelsy Fenerich-Verani ◽

José Roberto Verani ◽

Hugo Pereira Godinho ◽

Edson Vieira Sampaio

Keyword(s):

Body Weight ◽

Water Temperature ◽

River Basin ◽

Fertilization Rate ◽

Pituitary Extract ◽

Reproductive Characteristics ◽

Sao Francisco River ◽

Absolute Fecundity ◽

São Francisco River

Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed, respectively, by the equations: AF = - 33993 + 122308 Wt (r² = 0.88), IF = - 14823 + 58619 Wt (r² = 0.71) and FF = - 6553 + 29741 (r² = 0.61)

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Digenea of Hoplias intermedius and Hoplias malabaricus (Actinopterygii, Erythrinidae) from upper São Francisco River, Brazil

Revista Brasileira de Parasitologia Veterinária ◽

10.1590/s1984-29612015038 ◽

2015 ◽

Vol 24 (2) ◽

pp. 129-135 ◽

Cited By ~ 7

Author(s):

Danielle Priscilla Correia Costa ◽

Cassandra Moraes Monteiro ◽

Marilia Carvalho Brasil-Sato

Keyword(s):

River Basin ◽

Feeding Habits ◽

Minas Gerais ◽

New Host ◽

Hoplias Malabaricus ◽

Parasitic Fauna ◽

Sao Francisco River ◽

São Francisco River ◽

New Location

A total of 103 specimens of Hoplias intermedius (Günther, 1864) and 86 specimens of H. malabaricus (Bloch, 1794) from the upper São Francisco River, State of Minas Gerais were collected between April 2011 and August 2013, and their parasitic fauna were investigated. Four species of Digenea were found: metacercariae of Austrodiplostomum sp., and Ithyoclinostomum sp.; and adult specimens of Phyllodistomum spatula Odhner, 1902, and Pseudosellacotyla lutzi (Freitas, 1941) Yamaguti, 1954. The prevalence of the metacercariae was higher than that of the adult digeneans of erythrinids from the upper São Francisco River as a result of piscivorous feeding habits of these adult erythrinids. The presence of metacercariae and adult digeneans indicate that they act as intermediate and definitive hosts, respectively, in their biological cycles. Hoplias intermedius is a new host for the four species of Digenea, and the São Francisco River basin is a new location for the known geographical distributions of P. spatula and P. lutzi.

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