Biologia reprodutiva e genética de astyanax lacrustris: avaliação da razão sexual em cultivo

• Autor(a) principal: Garcia, Yasmin
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/216902
• topic: Pisciculture; Reproduction; Fish; Piscicultura; Reprodução; Peixes-Reprodução; Lambari (Peixe)

In 2018, Brazil produced about 722,560 tons of fish, 74 tons corresponding to the genus Astyanax, which is of great importance due to its properties as a bioindicator of environmental quality and its applicability in population studies. Among it’s species, Astyanax lacustris, popularly known as yellow-tailed lambari, stands out fot its ease of captive management and rapid reproduction. For genetic studies in fish species, microsatellites are highly applied molecular markers due to their codominance and high degree of polymorphism, resulting in eficiente research such as paternity and kinship. The aim of this study was to understand the reproductive biology of the species, testing crossing in different sexual proportions and to analyze how many males and how many females contribute to reproduction, as well as the conditions that influence males, thus enabling and optimizing A. lacustris production in the species pisciculture. The selected proportions were 5:1, 4:2 and 3:3 males: females, respectively, using the seminatural reproduction method. It was concluded that the number of males participating in breeding offspring is variable, as sperm conditions such as motility and concentration significantly influence reproductive capacity, while the female pattern is only one reproducing, regardless of how many are used. Thus, a larger number of males should be used to increase the chances of reproduction, and only one female, which will be responsible for the generation of all offspring.