Reproductive seasonality of the fish fauna and limnoecology of semi-arid Brazilian reservoirs |
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| Authors: | Sathyabama Chellappa Regina MX Bueno Thiago Chellappa Naithirithi T Chellappa Vera Maria Fonseca Almeida e Val |
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| Institution: | aPost-Graduate Programme in Ecology, Department of Oceanography and Limnology, Centre of Bioscience, Universidade Federal do Rio Grande do Norte (UFRN), Praia de Mãe Luiza, s/n, CEP: 59014-100, Natal, RN, Brazil;bPost-Graduate Programme in Material Engineering, Laboratory of Chemistry, Universidade Federal do Rio Grande do Norte (UFRN), Av. Salgado Filho, 3000, Lagoa Nova, CEP: 59078-970, Natal, RN, Brazil;cInstituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Ecologia, Laboratório de Ecofisiologia e Evolução Molecular, Avenida André Araújo, 2936 Aleixo, CEP: 69083-000, Manaus, AM, Brazil |
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| Abstract: | The native fish fauna commonly found in the drainage basins of rivers and reservoirs of Latin America, including those of the semi-arid Northeastern Brazil, are representatives of the Neotropical region. This work reports on the reproductive ecology of five commercially important and consumable native fish species, in relation to rainfall and hydrological variables of the semi-arid reservoirs in Brazil. Pluviometric precipitation, temperature, pH, dissolved oxygen and electrical conductivity of the water were registered, and maturation of fish gonads was assessed on a monthly basis. This region is characterized with short spells of rain interspersed with long dry season and rainfall seems to be the main environmental factor which modulates the timing of the spawning period of fish. Construction of reservoirs without adequate facilities for fish migration has an adverse impact on the migratory fish species which are of commercial and ecological importance to semi-arid Northeastern Brazil. |
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| Keywords: | Semi-arid reservoirs Tropical freshwater fishes Spawning Rainy season |
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