Soča is the biggest of our rivers, springing from the alpine valley of Trenta. The top part is mainly trout water. It flows through the picturesque gorge to the confluence with Lepena river. There also grayling joins the fish species in the river. It then gradually flows by Bovec and Čezsoča until it enters a narrower valley under Srpenica. There the flow builds up between large boulders, catching its breath in deep pools, before mellowing down by Kobarid, where the valley widens considerably. Here also the chub and barble join the already rich fish life of the river. There it starts to meander through the white sands, flowing softly towards Tolmin. After the confluence with Tolminka it enters a 7km long reservoir for HPP Doblar. In its depths live the largest marble trout as well as other fish species of our area.
Its uppermost part is managed by the Fisheries Research Institute of Slovenia. From Čezsoča to the confluence with Vogeršček, under the dam at Podselo its managed by the Angling club of Tolmin.
Idrijca springs under the village Vojsko in the hills above Idrija and is our second largest river. It first flows toward South East to Idrijska bela, making a turn towards Idrija (NE), than slowly turning again towards the Soča valley (NW). Because it springs in the forested hills it has a character of a Karst river with typical green color. Its banks are overgrown with trees to the shore and it has very deep pools with rapids and shallow runs between them. It flows into the HPP reservoir at Bača pri Modreju, joining Soča under Most na Soči. All the native species of fish and rainbow trout are present in this river.
The upper part of Idrijca is managed by the Angling club of Idrija. From the bridge in Stopnik to the confluence with Soča it's managed by the Angling club of Tolmin.
Grayling is an endemic salmonid species to our rivers. It lives is all our rivers except Kneža, Koritnica and Bela. In our waters it grows to 60 cm (23,5') and 2 kg (4,5 lb) in weight. It is well known from its long lively colored dorsal fin. It feeds almost exclusively on aquatic insects because of its soft mouth but the larger specimens go for other smaller fish as well.
Because of its notoriously cautious feeding habits and its special looks this fish is vary prized by fly fisherman.
Season: May 15th - October 31st
Min. size: 45 cm
Salmo trutta marmoratus
The Marble trout is an endemic species of the Adriatic watershed. It grows considerably larger than other species of fish in our waters. The biggest specimens documented were over 120 cm (47') long and weighed over 20 kg (44 lb). It is discernible from other trout by its unique marble pattern and a disproportionally large head which takes a quarter of its full body length. It feeds on aquatic insects, but mainly on other fish.
Because of its size and elusive nature the "Marble" is very sought after and is considered a true achievement of every fly fisherman.
Season: April 1st - September 30th Min. size: 60 cm
Leuciscus cephalus cabeda
Chub is an endemic species from Cyprinidae family typical for Adriatic region. Usually this fish lives in shoals. Its body is cylinder shaped and it has quite large scales all overs its body. It can grow up to 70 cm (25,5') and to 5 kg (11 lb) in weight. It feeds on aquatic organisms, plants and fruit.
Because it is considered a white fish it has been frowned upon by fisherman, but this fish can be a real fighter and can be very difficult to catch on a fly.
Season: April, July - October
Min. size: 30 cm
Rainbow trout is an allochthonous species in European rivers. It established itself because of easy farming and adaptability to different man made and wild habitats. It does not crossbreed with marble trout but it competes with it for food and space. It is easily discernible from other fish from its rainbow colored flank and small black dots on its whole body. It can grow to 80 cm (31,5') an up to 8 kg (17,5 lb) in weight. It is not a very picky feeder eating both aquatic insects and other fish. The rainbow trout reproduces naturally in our rivers so “wild” specimens are common.
Because of its aggressive nature and a strong fight, it is quite an interesting fish for fisherman.
Season: March 26th - Oktober 31stMin. size: 26 cm
Barbel is like the chub an endemic cyprinid species and it also lives in shoals. It has reddish colored fins and whiskers by which it can be distinguished from other fish. It grows up to 70 cm (27,5') and 4 kg (9 lb) in weight. It is generally a bottom feeder eating aquatic organisms and plants. It lives mainly in Soča from Kobarid down, Idrijca and the lake at Most na Soči.
Season: April, July - October
Min. size: 30 cm