The trout fishing season here opened at 6:35 (i.e. sunrise) just over two weeks ago. There are 15 000 card carrying anglers in the département of Indre et Loire, as well as holiday makers, day anglers and those who just buy a weekly licence.
Although the Touraine isn't particularly known for its trout streams, traditionally, the opening of the trout season opens the angling season, so it is a much anticipated moment. In fact, the area is crisscrossed by a good many small watercourses which shelter populations of wild trout, which both reproduce naturally, as well as being augmented by fishery stock. In order to take the pressure off the wild population the Fédération de Pêche d'Indre-et-Loire releases 1500 kg of trout into the category 2 rivers.
so I imagine they are farmed, not wild.
In category 1 rivers anglers are only allowed to fish on the weekend, Wednesdays and public holidays until 2 May. After that they are allowed to fish every day until 19 September. Category 2 rivers are open every day right from the beginning of the season. Anglers are allowed to take trout measuring at least 25cm long, and the catch is limited to 6 fish. Fishing after dark is not permitted.
Of the rivers near us where you might catch a trout, the Aigronne, which flows through le Grand Pressigny, is a category 1 river. The Brignon (Betz-le-Château, Neuilly-le-Brignon) and the Echandon (Tauxigny) are category 2 rivers. Anglers can also fish for trout, if they have a licence, on plans d'eau which are stocked in March and April.
Note that I am not an angler and have never purchased a fishing licence in France. I cribbed most of this information from the local newspaper.