Rivers & Fish

Our Rivers


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.


Tolminka Springs deep in the Triglav National Park in the valley Polog. The river carved it's way towards Soča through a steep valley, a gorge at places, finaly opening up a bit when it reaches the Tolmin basin. From spring to confluence with Soča it runs for 10,2 km. The whole stretch is fishing water with the exception of the Tolmin gorge regional park. You can find all the species of trout and also grayling in the lower part.


Učja enters Slovenia from Italy and flows for another 6,1 km before confluencing with Soča. This is a remote fast river with dificult acces but spectacular scenery. The easiest way to aproach is on the old border crossing with Italy and at vilage Žaga where the river comes out of the narrow canyon. It is mostly populated with trout, there are also grayling in the lower part.


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.


Trebuščica springs under Mrzla rupa and makes a 14 km long way until reaching Idrijca at Dolenja Trebuša. Its first part (5,7 km) is a fish breeding reserve for the genetically pure marble trout. All the rest (8,3 km) is fishing water. The valley is very picturesque with deep pools, cascades and rapids, the gravel deposits only barely enabling wading up its narrow canyon parts. It is populate by all the species of trout, grayling, in the lower part chub and barbell too.


Bača springs under Slatnik and Lajnar carving a deep valley Baška grapa (lit. Baća ravine). During the whole length of 21,4 km of pools and runs it's guarded by trees and followed by a road and a railway. It flows into Idrijca at Bača pri Modreju. The first 3 km are a fish reserve for marble trout the rest is all fishing water divided into two parts by a dam in Klavže. Throuhout both parts live grayling and trout with the exception of rainbow trout which is not present in the upper part.


Nadiža springs in Italy, enters Slovenia, forms an 11,9 km long arch and returns to Italy again. Untill it comes under Seldo it flows in a tight valley with rapids and deep pools, then the valley widens and uder Robič the river almost disapears in the thick gravel deposits. It is inhabited by all trout species as well as grayling, chub and barbel.


Kneža is a typical Alpine river collecting its water from under Vogel and Rodica, flowing for 8,3 km through a tight valley towards the valley of Bača . The two rivers confluence under Kneža village. It is all fishing water and you can find grayling and all the species of trout except rainbow.

Our Fish


Thymallus thymallus

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

Marble trout

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

Oncorhynchus mykiss

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 31st
Min. size: 26 cm


Barbus plebejus

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