Integração de fatores zootécnicos e ecológicos para avaliar o bem-estar fisiológico de Penaeus vannamei em fazendas conectadas ao Lago Maracaibo, Venezuela
Resumo
A carcinicultura comercial semi-intensiva no Lago Maracaibo, Venezuela, é afetada por processos de eutrofização resultantes do excesso de nutrientes, que favorecem a proliferação de microalgas e a deterioração da qualidade da água. Há pouca informação sobre a relação entre variáveis de produção, flutuações nas comunidades planctônicas e seu impacto no estado fisiológico do camarão. Portanto, o objetivo deste estudo foi analisar a relação entre variáveis de produção e ecológicas com o Índice de Condição Relativa (ICR) como indicador fisiológico de Penaeus vannamei durante um ciclo de cultivo de dez semanas. As variáveis de produção e ecológicas foram monitoradas semanalmente, incluindo análises qualitativas e quantitativas de fitoplâncton e zooplâncton. Os dados foram avaliados utilizando correlação de Pearson, seleção de variáveis com VIF e AIC, regressão logística com redução de viés de Firth e análise de deviance. O camarão apresentou um ICR médio final de 1,36 ± 0,92 e um ICA médio de 1,81 ± 0,89. A comunidade fitoplanctônica foi dominada por cianobactérias (57,8 %), seguidas por clorófitas (32,4 %) e heterocontófitas (9,1 %), enquanto o zooplâncton foi representado principalmente por copépodes (69,9 %). No entanto, o modelo mostrou uma associação positiva entre o índice de resistência à clorofila (CRI) e a abundância de Chlorella sp. e náuplios de cracas, e uma relação negativa com Mesocyclops sp. Esses resultados sugerem que a qualidade nutricional e funcional do plâncton pode ser mais relevante do que sua abundância total, constituindo um bioindicador de bem-estar fisiológico e um potencial fonte alimentar suplementar.
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Direitos de Autor (c) 2026 Nancy Hernández de Guerrero*, Randi Guerrero-Riós, Jeny Reyes-Lujan, Juan Bárcenas, Roberta Mora, Enrique Quintero-Torres

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