SU1282833A1 - Method of growing fish in water basins - Google Patents

Abstract

The invention relates to the field of fish farming, in particular to methods of growing fish in water bodies. The invention is aimed at simplifying the utilization of biomass, its more complete removal from the reservoir and preventing the formation of freezing conditions. In order to achieve this goal in the method of growing fish, which involves removing algae biomass from the surface of the reservoir, this operation is carried out during a period of mass algal flooding, biofilm formation and the development of pre-anchor species. Before removal, the biomass is applied by spraying the feed, pre-crushed to a particle size of 0.5 to 1.5 mm. Compound feed is distributed in an amount from 1:30 to 1:50 to the amount of biomass and biomass with feed maintained for 0.5 to 2.0 hours, while the removal of biomass is carried out by floating wide-grip devices with concentration on feeding places. 3 il. with (L

Description

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The invention relates to fish farming, in particular, to methods of catching fish in reservoirs, and can also be used for cleaning surface water for commercial fishing purposes.

The purpose of the invention is to simplify the utilization of bioassay, more fully remove it from the reservoir and prevent the formation of obstructive effects.

The proposed method is simple to implement and is available to any hatchery, with this, fish productivity is 8-10% higher due to the utilization of highly nutritious protein products of biofilm, flotation and neuston organisms, and economy of feed is observed by 7-9%.

FIG. 1 to 3 schematically shows the implementation of the proposed method.

The method of growing fish in water is as follows.

In a fish-breeding reservoir, the presence of a floating mass of algae, the formation of a biofilm by accumulation and the duration of the preservation of puffy biogas under calm weather are visually determined. Then predict the possibility of the occurrence of obstructive effects by known hydrochemical and hydrobiological methods. To calculate the amount of feed that is to be discharged into the reservoir, the algae biomass is determined by weighing the wet weight from 1 m in typical parts of the reservoir, followed by multiplying this amount by the pond area.

Thereafter, the algae biomass is applied by spraying the feed, pre-ground to the fine state (particle size from 0.5 to 1.5 mm). The feed was sprayed using ground equipment or floating equipment in an amount (1:30) - (1:50) to the mass of algae.

Algae biomass with mixed feed applied to it is held for 0.5-2 hours.

At this time, the nutrients that are partially leached from the feed are absorbed by the biomass of algae, biofilm, and neustonic organisms and flavored.

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After keeping the biomass of algae with feed collected from the surface of the reservoir (Fig. 1 and 2) and concentrate on feeding places.

The concentration of algae is carried out by slider floating devices, such as a hitch of wooden slats with a total length of up to 70-100 m, with an apron made of finely cellular cells with a width of 30 m crawled along the entire length of the hitch (Fig. 3).

Target device over the entire maximum capture reach achieve the most complete removal of algal biomass from the entire surface of the reservoir.

After algae biomass concentration at the feeding place, it is eaten by fish for 4-8 hours.

Spraying algae particles of 0.5-1.5 mm in size on the biomass surface ensures their retention afloat, prevents particles from dropping to the bottom of the reservoir and

thus enriches the feed with nutrients

algae biomass.

With a ratio of feed to biomass of algae from (1:30) - (1:50), a stable retention of the feed mass on the surface of the water is achieved. At a higher ratio, it is possible to immerse the algae with mixed feed on the bottom, which will not allow the proposed method to be carried out.

The ratio of the mass of feed to the mass of biomass, lying beyond the specified limit, increases the time of aromatization of algae biomass.

The time of algae biomass with the mixed feed applied on it for 0.5-2 hours allows to fully absorb the aromatic substances of the compound feed.

If the biomass is mixed with the feed for a longer time, this may lead to the volatilization of the aromatic substances. With a shorter retention period, the algae biomass is not sufficiently saturated with aromatics, which reduces the attraction of fish to it and makes it difficult to eat fish. Processing algae directly in the pond significantly. simplifies their recycling, as is-. using them in fish feed does not require any complex equipment.

Example 1. In a 5.8 hectare pond in the period of mass development and floating of algae, flotation displays and biofilm formations, the amount of algae biomass was determined by weighing the wet weight from 1 m and then multiplying this amount by the area of the reservoir. The weight of the algae was found to be 400 kg. For spraying, 13.3 kg of feed was used (1:30 ratio), which was previously crushed to a finely dispersed state (particle size 0.5 mm. Spraying was performed from the shore and from the boat. 0.5 h after spraying, the concentration of the biomass was flooded a device of wooden slats with a total length of 70 m. The algae biomass was concentrated in feeding places, where it was fully eaten by fish after 7.5 hours.

Before algae biomass was removed, the oxygen content in water was 2.7 mg / l during the day and 1.8 mg / l at night. After removal of the biomass, the oxygen content reached 7.5 and 4.3 mg / l, respectively.

PRI mme R 2. In a pond with an area of 3.7 hectares with intensive fish farming technology against the background of the arrival

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biomass (feed ratio: algae biomass was 1:50).

The particle size of the feed was 1.5 mm. After keeping the algae biomass with feed for 2 hours, they were concentrated at the stern site with wide-buoyant floating devices. This mass was eaten by fish for 8 hours.

The oxygen content increased to 7.6 mg / l during the day and 4.7 mg / l at night using the proposed method, which prevented the mass death of fish as a result of demotion effects.

Claims (1)

Invention Formula The method of growing fish in reservoirs, which involves removing algae biomass from the surface of the reservoir and subsequent utilization of biomass by feeding it to the fish, which is different in that, in order to simplify the utilization of biomass, more completely remove it from the reservoir and prevent the formation of biomass, the biomass is removed. t in the period of massive algae surfacing, biofilm formation and the development of pre-wintering effects, before removal, apply biomass to the biomass by spraying compound feed, previously measuring lchen The wastewater from the water source is 35 ny to a particle size of 0.5-1.5 mm. a drop in oxygen content of up to 2.3 mg / l was recorded. This / indicates the onset of the pre-starvation state. In order to prevent a massive 40 fish death over the entire area of the reservoir, 5 kg of mixed feed was sprayed, since algae biomass studies showed the presence of 25.0 kg in the reservoir. feed intake in the amount of (1:80) - (1:50) to the amount of biomass and biomass with feed is held for 0.5-2.0 hours to flavor algae with feed ingredients, while the removal of biomass is carried out with floating wide-grip devices with its concentration in the reservoir on feeding places (rig. 3