This paper investigating the effects of thermal modulation and internal heating on Darcy-Brinkman bio-convection in a Newtonian porous medium containing gyrotactic microorganisms. A weak nonlinear stability analysis is used to analyze the stationary mode of bioconvection with low modulation and internal heating. The heat transport is measured by the mean Nusselt number, which is determined by the Ginzburg-Landau equation (GLE). The solvability condition is used at the third order of the perturbed parameter is used to calculate the GLE. The results are visually displayed to show how the system parameters affect heat transfer.The results demonstrate a progressive impact on the heat transfer of both Vadasz number and modulation amplitude. However, heat transfer is reduced as cell eccentricity and the modified bioconvection Rayleigh number increase. Internal heating causes the system to become unstable and transfer heat more quickly. Both bioconvection and internal Rayleigh numbers (Rb and R i) are of opposite effects on mean Nu. It is also found that only OPM/LBM are effective on controlling heat transfer than IPM. Additionally, it is found that only OPM/LBM are more successful at regulating heat transport than IPM. Further, it is found that the convective heat transfer process may be delayed, due to asymmetries and irregularities (α ̸ = 0) of microorganisms than spherical-shaped microorganisms (α = 0).