Little did I know that brook trout also exist in the Jura mountains.
Swiss Brook Trout (Salvelinus fontinalis)
Switzerland features a wide variety of salmonids. Not all of them are native to Switzerland, but some were introduced. For instance, the brook trout originally came from North America. This species has a very colourful display with its distinctive marbled pattern (called vermiculation) across the flanks and back of the fish. Moreover, the fins at the bottom (pectoral, pelvic and anal fins) show white rays, which are a striking contrast to the orange brownish belly. Inhabiting cold oxygen rich rivers and creeks (as well as mountain lakes), they are primarily found in the waters of higher altitude such as the Swiss Alps. Given the short summers at this height, this fish voraciously attacks large fly patterns. For example, during the Firebelly Guiding brook trout feasted on Chernobyl ants about a quarter of their own size. Given that this species is non-native to Switzerland, practicing catch-and-release with this fish is not allowed.
Fly Fishing with Jan
As pointed out above, brook trout primarily inhabit waters at a high altitude. However, on a recent adventure with my mate Jan, we came across brook trout in the Jura mountains.
Brook Trout surprise
Visiting a small creek in the Jura mountains, we were chasing brown trout with heavy flies such as the Black Widow nymph. After Jan had fished a promising hole for some time, I had my turn at it. On the first cast (which landed in the water), I immediately felt resistance when the fly approached a boulder. At the moment the fish took to the air, I recognized its colourful appearance and was stunned by the fact that brook trout exist in the Jura mountains.
On closer inspection, I discovered a shortened gill plates as well as a rather blunt head. The visible gills (red) were a clear indication that this fish was stocked to quite some extent. Usually, the vulnerable gills are fully covered by the plate in order to protect them. Due to the regulations, we took this fish home for dinner. Read more about sustainable consumption of fish here.
The remaining day, Jan and I proceeded upstream with few more fish to the net. Nonetheless, it was a memorable fishing trip. In particular due to catching a species, which I did not know existed in the Jura mountains.