Reprodução do peixe não-nativo Barbo-Rosado Pethia conchonius (Hamilton, 1822) (Pisces: Cyprinidae) na Zona de Amortecimento do Parque Estadual da Serra do Brigadeiro (PESB), Minas Gerais
DOI:
https://doi.org/10.37002/biodiversidadebrasileira.v3i2.324Keywords:
conservation unit, creek, non-native fish, Paraíba do Sul River, reproductionAbstract
A study was conducted to evaluate the reproduction of the ornamental non-native fish Pethia
conchonius in a headwater creek located in the buffer zone of Serra do Brigadeiro State Park, Paraíba do Sul
River basin, Minas Gerais state. Collections with sieves occurred bimonthly from January to December 2004 in
Pinheiros Creek. Based on the microscopic characteristics of the gonads, the following stages of reproductive
cycle were determined: 1=Rest, 2=Mature, 3=Spawned for females or Spent for males. Females and males
in reproduction (stages 2 and 3) were found throughout the study period. Spawned ovaries containing
oocytes 1 (initial perinucleolar), 2 (advanced perinucleolar), 3 (previtellogenic), 4 (vitellogenic) and postovulatory follicles indicated fractionated-type spawning in this species. Juveniles were also collected during
the entire period. The sex ratio did not vary between females and males along the year and bimonthly,
being 1:1. Management recommendations such as screens in equipment to prevent fish escapes, continuous
monitoring in ornamental fish farms and awareness are suggested to avoid environmental degradation by
the introduction of P. conchonius and other non-native fishes in the region
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