Animal husbandry – Entomological culture device – Egg treatment – production – or storage
Patent
1990-04-09
1991-09-10
Swiatek, Robert P.
Animal husbandry
Entomological culture device
Egg treatment, production, or storage
A01K 6100
Patent
active
050464523
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method for breeding roes or eggs of aquatic animals wherein suitable living-space is provided for them and therein, the roes or eggs are hatched. The invention also relates to an apparatus for breeding roes or eggs of aquatic animals having a container for providing suitable living space-space for the roes or eggs.
BACKGROUND OF THE INVENTION
In the conventional industrial systems of propagation of aquatic animals, their roes or eggs are separated and special living-spaces are provided for them. In all cases, the gas exchange being necessary for the evolution of the roes or eggs is provided from the water which has to be streamed through the living-space constantly in a great amount.
However, the conventional methods and apparatuses for artificial breeding of the roes or eggs have numerous problems. As it is known, the normal evolution of the roes or eggs necessitates specially treated water which has to be streamed in great amount for providing the intensive gas exchange as required by the roes or eggs. This has its reason in the fact that not only the embryo growing in the roes or eggs has to be fed with oxygen but the carbon dioxide produced by them and the nitrogen resulting from the autolysis of the died embryos have to be removed from the water.
For reducing the water consumption, it has been suggested earlier to regenerate and recycle the water coming out of the living-space of the known solutions. It has been proven, however, that this don't make easier and cheaper the artificial breeding of roes or eggs since, for recycling, clearing and regeneration, at least so many machines, materials and energy are needed as for clearing and treating the newly introduced fresh water. Nevertheless, the conventional solution occupies a relatively big surface area and it can only be erected only in the neighborhood of an adapted water source and energy source.
All these factors mean a considerable hindrance in the way of the breeding of roes or eggs under industrial circumstances. Therefore, the breeding of roes or eggs is not solved until yet in the quality and amount as required in today's agriculture.
ESSENCE OF THE INVENTION
The main object of this invention is to eiliminate the above said deficiencies and to provide a method and an apparatus for breeding roes or eggs of aquatic animals wherein optimal circumstances can be provided for their evolution and, thus, they can be rescued to a greater extent as before for further raising. Another object of the invention is to provide a safe, reliable and automatic function also with regard to the special sensitiveness of the roes or eggs. Further to this, the construction should be simple and easy to operate.
According to the improvement of the known method in this invention, during the hatching, the roes or eggs are held in gaseous environment and a gas exchange of the roes or eggs is provided at least partly from the gaseous environment, wherein the living-space is humidified for avoiding desiccation of the roes or eggs.
According to a preferred realization of the method in this invention, the breeding is realized in a first-pre-hatching period, in a second hatching period and in a third preraising period, and in the first pre-hatching period gaseous environment, in the second hatching period liquid and gaseous environment and in a third pre-raising period liquid environment are used.
According to a further embodiment, the living-space of the first pre-hatching period and of the second hatching period is heat isolated and semi-hermetically closed against the out-world.
In this case it is also possible that the gaseous environment of the first pre-hatching period has a constant temperature and a relative moisture content of 100 percent.
According to a further preferred realization of the method in this invention, an at least partly noncontinuous gas exchange is provided between the gaseous environment of the first pre-hatching period and the out-world.
It is also preferred, when the hatched roes or eggs are
REFERENCES:
patent: 4014293 (1977-03-01), Salter
patent: 4742798 (1988-05-01), Blackett
Bercsenyi Miklos
Laslzlo Lajos
Nagy Andras
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