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This river is situated in central western part os Slovenia and is 60 kilometers long. It has karstic characteristic and it flows through Idrijca valley. The biggest town in the valley is Idrija, which is known for it´s second biggest mercury mine in the world (now closed). After it´s journey it flows into Soca river.

The main characteristic of Idrijca river is it´s quick water level rising and declining and its very slippery stones caused by a variety of algae that are growing on them. For this river is remarkable also that it has the shortest river inflow called Jezernica, which is about 50 meters long. This short river is known for it´s spring called Divje jezero or “wild lake” in which the endemic Olm or Proteus (Proteus anguinus) was discovered.

The Idrijca river is also known for it´s other water inhabitants. Because of it´s connection with Soca river it has a big population of native marble trout with the same genotype, but with a different fenotype, as a result of different habitat. This difference doesn´t impact on it´s lenght and weight. Exemplars bigger than 10 kilograms are very common. So if you want catch them, heavy gear is advised. The main technique allowed is fly-fishing, spinning is allowed only to people older than 60 years, but only in a small district.

For dry-fly enthusiasts big graylings are good challenge, especially in the summer months when the water level is low, this could be the only option to catch them.

Other species that live in Idrijca are: brown trout, hybrids, rainbow trout, chub and barbel.

Peter

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The Soca river (in slovene Soča; in italian Isonzo; in german Sontig) is an alpine river and is considered to be one of the most beautiful rivers in Europe. This consideration is supported by the fact that is also called “emerald beauty” (because of its color) and because of it´s astonishing surroundings, formed by Julian Alps. It is situated in the western part of Slovenia, the lower part of it flows also in Italy where it enters in the Adriatic sea. It´s total length is 137 kilometers.

From the history is known as the theater of fights between Italy and Austro-Hungarian Monarchy in the First World War between 1915-1917 (also known as the Isonzo Front by historians). This battle is till now considered to be the biggest mountain battlefield of all times.

Nowadays is also known as one of the best fishing rivers in Slovenia and in Europe. Many slovenian, italian, french, english, eastern country…, fisherman´s come to enjoy the nature outside and inside the water. The most claimed fish is the native marble trout (Salmo marmoratus) or. “trota marmorata” in italian. In slovenian language is called “Soška postrv” which means “trout from Soca”. This river is ideal for it´s habitat, because is large with deep pools. It also has medium and fast rapids which are ideal for another native species – the adriatic grayling (Thymallus thymallus). The main difference between this grayling and Danube grayling is in it´s absence of black spots in the front part of the body and it´s greyish coloration.

Other species that lives in Soca river are: brown trout, hybrids (marble trout x brown trout), rainbow trout and chub.

This river can be divided in 3 parts which represent 3 different associations that manage it. On the most part of the river only fly fishing technique is allowed, with an exception on the lower part, where also spinning is allowed.

The upper part.

The middle part.

The biggest marble trout caught in Soca river (120cm, 22,5 kilograms)!

(Source: Angling club of Tolmin)

This one was caught in july on dry-fly.

This one was caught on nymph in september.

Peter

 

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This river flows in Vipava valley, which is situated in western part of Slovenia. It´s a karstic river and it´s 44 kilometers long. It could be divided in two parts: the upper part is faster and shallower and appropriate for salmonids. The lower part is deeper and slower and is ideal for cyprinids. Now is turn to write something about the upper part.

The most celebrate salmonid which lives in this river is the indigenous marble trout. Other species that lives in this part are: brown trout, grayling, rainbow trout and hybrids (marble X brown). Despite the river size you can find marbles up to 15 kilograms (found one dead last year), browns up to  5 and graylings bigger than 50 centimeters. The rainbow trout was introduced in the last seventies and now represent a threat for habitat and food. In this part you can find also some cyprinids such as chub, common nase, common barbel and some smaller species.

Because of the majority salmonid population the principal fishing technique is fly fishing, but also spinning (in some areas) is allowed. The best time for fishing is in may and june when a large number of insects swarms (especially big caddisflies) and in september and october when fishes became more voracious because of the winter approaching. Especially graylings became very active on the surface and you can catch them easier than in other months.

For now is all. Down i put some pictures to make an idea of the river and its residents.


This marble trout was found dead last summer (15,60 kilograms).

(Source: Fishing association Rence)

Peter

 

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