There are some uncertainties about the number of casualties (39 or 40 perished - 6 or 7 rescued). The Z-26 torpedoed the Bateau without any attempt to rescue survivors. The Z-24 and Z-25 did not participate in the sinking. Luckily the Z-25 crew was more softharted and picked up 6 (7?) survivors (6 according to their war diary). Z-26 torpedoed the Bateau at 01:48, and she sank at 01:55. The Z-26 got a very short career after this incident, as she shortly after was sunk by HMS Trinidad, HMS Fury and HMS Eclipse and lost with 243 men.
The captain of the Bateau was a Norwegian, and he perished together with at least one another Norwegian crew member. As common with the Panamaian vessels the crew was probably mixed up with a lot of differant nationalities.
When lost, the Bateau was a struggler to the convoy, and a "sitting duck" when located by the German destroyers.

Main sources: War diary (KTB) of Z-24 and Z-25 + convoyreport for PQ.13

Erling