For future reference, it is best not to put your finger anywhere near a fish's gills. If you touch the gills, it may not immediately harm the fish. It might swim off and appear fine, but later it may have difficulty breathing.
To get a good picture you can cradle the fish by putting one hand right in front of the tail and the other hand just behind the pectoral fins (the fins right behind the head). I have attached an example below.
By the way, that was a really nice fish.
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