Ultrassonografia para determinação do sexo da tainha
DOI:
https://doi.org/10.20950/1678-2305/bip.2024.51.e902Palavras-chave:
Gônadas, Peixes marinhos, Mugilidae, Reprodução, UltrassomResumo
A ultrassonografia tem sido cada vez mais utilizada em programas de melhoramento de aquicultura para determinação não invasiva do sexo e do estágio de maturação das gônadas em peixes. Pela primeira vez, esse exame de imagem foi realizado em um mugilid (Lebranche mullet). Dezenove peixes machos e 12 fêmeas foram submetidos a essa avaliação, os quais foram selecionados por estarem em estágio final de maturação das gônadas, fato previamente confirmado por espermiação por pressão abdominal e biopsia ovariana (oócitos de 626 ± 12 μm), respectivamente. As imagens ultrassonográficas foram obtidas após a anestesia, utilizando uma sonda linear multifrequencial na frequência de 8 MHz em fêmeas e 10 MHz em machos, que revelaram diferenças significativas na ecogenicidade entre as gônadas. Nos machos o teste apresentou aspecto hipoecoico e homogêneo, enquanto nas fêmeas os ovários apresentaram aspecto hiperecogênico e ecotextura granular, em comparação às estruturas corporais adjacentes. O tempo de varredura para identificação sexual e caracterização das estruturas do sistema reprodutivo em cada peixe foi de 2,58 ± 1,68 segundos para machos e 2,40 ± 1,05 segundos para fêmeas, não houve diferença significativa (p > 0,05) em relação ao tempo de sexagem. Assim, a identificação do sexo da tainha Lebranche (Mugil Liza) por meio da ultrassonografia se mostrou um método eficaz, rápido e não invasivo quando aplicado a peixes com gônadas maduras durante o período reprodutivo da espécie.
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