METHOD OF ERECTING SPAWNING REDDS IN POND WITH BIOPLATO STREAM FOR BREEDING BROWN TROUT FRY Russian patent published in 2025 - IPC A01K61/17 

FIELD: fish farming.

SUBSTANCE: invention relates to fish industry, in particular to artificial salmon fish breeding, and can be used for reproduction of brown trout stocks. Method includes preparation of spawning redds, artificial fertilization of eggs at fish farms by dry method, transportation of eggs to spawning grounds, laying of eggs in spawning redds, which are arranged in a pond, erected next to a mountain river, with which the pond is connected by supply and discharge channels, which are initially kept closed on the side of the river until the pond with spawning grounds is erected. Supply channel is arranged in the form of a bioplateau stream filled with gravel and planted with club-rush, reedmace, iris and other higher aquatic plants, which purify river water directed into the pond. Spawning redds of river pebbles are erected at the bottom of the pond at a distance from each other. Between the redds and on the coastal slopes of the pond, higher aquatic plants are planted, which create favourable conditions for incubation of eggs and development of fish fry, and fertilized eggs are laid in the redds using a transparent plastic bottle with an open neck. Preliminary prepared is a one and a half-litre bottle with water and a portion of fertilized eggs for each spawning redd, before laying the eggs, the redds are dug manually to depth of 15 cm, where a said bottle with a portion of caviar is emptied into each redd, caviar spills onto the pebbles and then is sprinkled with large pebbles on top. From the end lower part downstream of the pond to the main river bed, a discharge channel is erected, through which grown fish fry swim into the river for restoration of natural stocks of brown trout. After completion of construction of structures and spawning redds with laid eggs, inlet section of supply channel and outlet section of discharge channel are opened, river water, passing through a supply channel (bioplato stream), covered with gravel and overgrown with higher aquatic plants, is cleaned and enters the pond, fills it and creates conditions for incubation of eggs and breeding of brown trout fry.

EFFECT: invention provides favourable conditions for development of brown trout fry.

1 cl, 3 dwg