- marketable fish in agreed piece/weight 
- replacement and generational fish
 
Other fish

Common perch 

The common perch is the typical representative of the old perch (Percidae)  family, which includes about 96 varieties living in North America and Europe (particularly western and northern France). In this country,  it lives throughout the whole region in both standing and flowing waters. It lives in societies and avoids fast streaming and cold waters. Spawning takes place in temperatures of 7-8 degrees Celcius. The female lays 20,000 to 200,000 spawn on stones or submerged branches. Its excessive reproduction ability causes over-reproduction, ousting other fish species living in its pond. It is a much-sought-after sport fish.

 
 
 Burbot

Burbot is a night predator. Its body has a long, cylindrical shape, allowing it to sneak up on its prey. Its characteristic feature is the single moustache-like appendage in the middle of its chin. In this country, it is the unique representative of the gadoids family (Galidae). Burbot is a cold-loving fish. It lives near the bottom, hiding from daylight. It also grows in mountain streams, where it causes considerable harm by feeding on the more popular salmon. The female lays spawn (10 thousand to 3 million) on the sandy bottom. Its biggest appetite is in winter when water temperatures are 2-4 degrees Celcius. It feeds on insects and just about all larger water animals, including fish, crayfish, and frogs. In this country, it reaches a maximum weight of 3 kg. It has very tasty flesh and big liver like all cod fishes. Recently, it has grown in importance as a sport fish.

Catfish

The catfish family includes as many as 120 genera, but, in this country, there is only one endemic variety. It lives throughout the whole region in lowland sections of rivers, their tributaries, and artificial reservoirs. Catfish is a warm-loving fish, but it sets off for prey usually after sunset or early morning. It lays eggs in pairs in prepared nests. Small fry feed on plankton, later on insect larvae and fish. In its third year of age it reaches a weight of 2 to 2.5 kg. This typical lowland water predator can big sizes, however. Catches of catfish of 60 to 85 kg have been recorded in recent times. It is an attractive sport fish, but it is also economically valuable because it culls less desireable fish.