Birth of Narcine brasiliensis (Chondrichthyes, Elasmobranchii) at the Santos City Aquarium in São Paulo, Brazil (2016-2018) / Nascimento de Narcine brasiliensis (Chondrichthyes, Elasmobranchii) no Aquário de Santos em São Paulo, Brasil (2016-2018)

Alex Sandro Luiz dos Santos-Ribeiro, Alberto Ferreira de Amorim

Resumo


The Santos City Aquarium (AQS) maintains sharks and rays to develop environmental education, informing its visitors about their importance. A pregnant specimen of electric ray or shakes, Narcine brasiliensis, fished in Santos (São Paulo, Brazil) was donated to AQS. After about two months, 9 individuals were born, of which three were live births. In order to observe the development and well-being of the 3 specimens, monitoring was carried out for 24 months (Total Length-TL and Total Weight-TW). The females, called R1, R2 and R3, were kept in a 200-Liter enclosure, with a closed mechanical and biological filtration system and a daytime photo period of 12h/day and 12h/night. The water’s parameters were periodically checked (temperature, pH, NO2, NH3 and salinity). The initial growth phase and the well-being assessment were obtained through the weight/growth ratio and the condition factor. Through the condition factor analysis, it was observed that R1 and R2 had positive asymmetric growth in the first 4 months and maintained symmetrical growth until the end of the experiment. However, R3 displayed less development from the first months, probably due to a malformation of the mandible. Results demonstrate that the R1 and R2 specimens had similar growth and doubled in size in the first year of life. There was no significant difference between weight/length regressions, showing the similarity of growth between captive and free-living specimens (caught in fishing). It can be said that the good conditions of the AQS system probably contributed to the welfare of the specimens.


Palavras-chave


electric ray, shaking ray, management, growth, captivity.

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Referências


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DOI: https://doi.org/10.34188/bjaerv4n1-052

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