Automorphism groups of Mori Del Pezzo fibrations over an irrational curve

We study the automorphism groups of Mori Del Pezzo fibrations over a smooth projective curve $C$ of positive genus. From that, we obtain a classification of maximal connected algebraic subgroups of $\mathrm{B}\mathrm{i}\mathrm{r}(C\times {\mathbb{P}}^2)$. Our results hold over any algebraically closed field of characteristic zero.