Those are 324 mm light weight torpedo launchers. Any 533mm launchers that can launch something like the Soviet Type 65 or American MK-48 or European BlackShark. As the premier ASW of the PN, the installation of at least two heavyweight torpedo launchers on each side of the ship will allow the navy to counter submarines out to 50 km instead of the 20-22 km of these light weight Torpedos.
perhaps building another deck level on top of where the Anti-ship cruise missile launchers are currently located and placing these launchers on the current deck and moving the launchers up to the new upper deck. Leaving room to reload the launchers. Even carrying just 4 heavyweight Torpedos and 4-8 reloads would be a significant improvement to offensive ASW