The aim of current study is to examine the effects of thermal radiation and activation energy with the significance of bioconvection and motile microorganisms on Casson hybrid nanofluid flow passing through a cylinder. The Cattaneo-Christov heat and mass flux theory is also presented in this study. The SWCNT and MWCNT are considered for enhancing thermal transmission rate. https://fitnessgravesyardes.shop/product-category/top-cover/