SU1423076A1 - Method of determining the optimum time of spawning of producing carps - Google Patents

Abstract

This invention relates to fish industry. The aim of the invention is to increase the yield of young Carp growers in one reservoir divided by a permeable partition 4 into two compartments. Females are placed in one compartment 5, males are placed in another compartment 6. The partition prevents the mixing of sex groups and the formation of nests, while permeability provides identical conditions in the compartments. At a certain moment, the overwhelming majority of fish migrates into zones 7 of the spawning contacts, the fish begin to move along the partition 4 parallel to each other. This moment is optimal for spawning. Producers are then transferred to spawning ponds. I il. yu (L

Description

The invention relates to the fishing industry, and in particular to methods for determining the optimal moment of replanting carp producers for spawning.

The purpose of the invention is to increase the yield of juveniles.

The proposed method allows to increase the yield of fry from the nest due to the simultaneous maturation of males and females and, in turn, increase the fish productivity of spawning ponds. The method is simple to execute.

The method for determining the optimal moment of landing of carp producers for spawning consists in the fact that carp producers are kept in one pond divided by a permeable partition into two compartments. Females are placed in one compartment, and males in the other. A permeable septum prevents (the displacement of sexual groups and the formation of nests, and its permeability provides identical conditions in the compartments, as well as visual, acoustic and other contacts between manufacturers, I As they warm up, accumulate, nutrients and mature.> [Gonads, producers of the opposite sex begin show interest (to the partner ^ behind the septum. At some point, the vast majority of fish moves into the zones of pre-spawning contacts. The moment when the fish begin to move along the septum (p are parallel to each other, it is optimal for the planting to spawn. The partition is removed, drained and pond.

• producers are planted for spawning according to generally accepted methods ”

The drawing shows a diagram of a pond with compartments for males and females.

The pond contains a dam 1, a spillway. 2 and water supply 3 structures, permeable partition 4, compartments 5 and 6 for females and males, respectively, spawning contacts.

zone 7 pre45

Example 1. Producers were placed in a pond, divided by a mesh partition into two compartments: in one compartment - males, in the other - females,

At some point, the vast majority of fish moved into the zones of pre-spawning contacts. The fish began to move along the septum parallel to each other. The partition was removed, producers were planted in spawning ponds. There were no refusals from the rut. There were 35 nests. The spawning time was 10 hours. The output of fry at the age of 7 days per ΐ female amounted to 120 thousand pieces, per 1 ha of the pond - 6000 thousand pieces.

PRI me R 2. Producers were placed separately. When establishing the spawning temperature, males and females were planted in a spawning pond. The number of nests was 15, the number of abandonment of the rut 5. The duration of spawning was 3Q h, the output of fry at the age of 7 days per 1 female was 80 thousand, pcs., Per 1 ha of the pond - 4000 thousand pcs.

All indicators are significantly lower than indicators in example 1, although the number of manufacturers is equal.

Claims (1)

Claim A method for determining the optimal moment of carp production for spawning, including keeping males and females separately before spawning and establishing readiness for spawning, characterized in that, in order to increase the yield of juveniles, the producers are kept in one reservoir, divided by a permeable partition into two compartments, in one of which males are placed, in the other - females, and readiness for spawning is judged by their synchronized swimming along the septum.