Yepp, it would be nice to know if those are german or french torpedoes!
I found one candidate of a french torpedo that might resemble the ones in the storage-photos, but I believe it was a model introduced after the war. I have sent the photos to a collegue of mine with far better general knowledge on torpedoes than me. Maybe he will have an idea (I don't expect an answer for at least a few weeks though).
Far from being an expert myself and speaking of german torpedoes in France, I found another interesting picture of a barge moored alongside Lorient dock, loaded w torpedoes. The caption states these are "G7-type torpedoes for submarine use". Again, another unusual (and appealing to the eye) warhead finish.
I have seen a photo of a german torpedo with the similar finish of the head being loaded into a U-boat (I couldn't see if it was a warhead or exersice-head - that's in fact hard to tell on this photo as well, although my best guess is exercise). I have no idea if this was some sort of standard pattern introduced later in the war, if it was a "local" variant in a certain torpedoarsenal or even a pattern used for a special purpose. It's not the standard pattern used from before the war for sure. In regards to these being G7a: It's impossible to verify that from the low quality of the photo. As a general rule, I would not rely on photo-captions in books or elsewhere...
I got a reply from my collegue, who have significantly more knowledge on torpedoedes than me (especially everything non-german). According to him, these could be french torpedoes, but as the french have been very secretive about their weapons, there isn't much photos and information available to veryfy this 100%.
Here are some facts though:
The torpedes in question are for sure not german-manucatured
The Brest-facility was built by the french in 1939 (originally as a storage for aircraft-engines), and was turned into a torpedo-facility by the germans in june 1941 (used for production and maintenance - servicing the part of the atlantic fleet stationed in France). The Brest-facility was the largest german torpedoarsenal, and was evacuated and taken over by the french on august 25, 1944. The french rebuilt the facility and continued using it for torpedostorage/-maintenance from september 1944.
The germans captured and used enormous amounts of foreign weapons, including torpedoes. For example, the french 55cm types 24M and 23DT was used on captured frech surfacevessels.
British torpedoes might also have been used by the germans (the dutch used these, and germany captured some dutch vessels, and reused dutch torpedotubes in at least 3 shore torpedobatteries in Norway/France).
Conclusion? Impossible at this stage to be 100% certain, but my collegue and I thinks the 24M and 23DT are the most likely candidates, although there are no known photos/drawings of these torpedoes to compare with.
Another fact that might be helpful, is knowing when the photos are taken (before/during/after the german period in Brest?). Are the uniforms verified german (germans might have been used also after august 1944)?
If anyone can provide more information (including photos/drawings) on french torpedoes, I'd be very happy!