Animal husbandry – Entomological culture device – Egg treatment – production – or storage
Patent
1986-07-18
1988-05-31
Murtagh, John E.
Animal husbandry
Entomological culture device
Egg treatment, production, or storage
114264, A01K 6100
Patent
active
047473690
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a device for breeding fish and the like in open sea or lake in at least one netted bag which is supported by a pontoon, the depth position of which is variable.
BACKGROUND OF THE INVENTION
When breeding fish there is produced materials which in high concentrations negatively will influence the growth balance in the surrounding medium, such as the sea or the lake. High concentrations appear upon breeding in smaller lakes, basins or at breeding in bays and near the seashores. The environmental pollution load will be a disturbance in direct proportion to the amount of fish raised and the water exchange ratio. The water exchange ratio increases exponentially very rapidly with an increased distance from e.g. a seashore and is at deep waters as big that such an emission of otherwise environmental pollution load increasing materials will be considered as very marginal. Hitherto the breeding of fish in open waters have mainly been carried out to an experimental extent. Selfsupporting breeding plants having volumes about 10,000 m.sup.2 are today built, but these plants cannot be located in open waters where the water exchange rate is satisfactorily without substantial reconstruction.
The breeding plants hitherto designed mainly have consisted of annular pontoons, which also are used as a working bridge and which carries one or more netted bags which by means of sinkers enclose a bigger or smaller water volume. The pontoons can be a rigid tubular structure or a number of floating bodies upon which bridges have been attached. These plants are however quite inappropriate in open sea, where waves several meters high can occur. It has also been suggested pontoons shaped as very coarse rubber hoses be used. Plants made in such a manner have proved also to stand very heavy sea but they have a negative effect which arises when the rubber tubes follow the movement of the waves, whereby the netted bag at irregular upwards and downwards movements will have a stressing influence on the fish.
A problem with big breeding plants adapted to open sea or lakes, which for instance can have a diameter of 40-50 meters, is the handling of the fish when taking up the fish, which has been brought about by lifting the netted bag, but the boarding and the transfer of loads such as fodder for the fish from a ship to the breeding plant can also, due to the rough sea, be a problem. Another problem at big breeding plants is that they preferably should be closable also at the top to prevent birds and other unauthorized creatures to reach the contents of the netted bag.
THE PURPOSE AND MOST ESSENTIAL FEATURES OF THE INVENTION
The purpose of the present invention is to make possible breeding of fish in open waters, whereby the environmental pollution loads are no longer a problem. Another purpose is to provide, also for very big breeding plants, an upper cover and such a design that the breeding plant certainly is adaptble to waves, but yet so rigid that the fish is not stressed by the movements of the netted bag. It should furthermore be easy to board the breeding plant independent of the wind conditions and the device should be so designed that the taking up of the fish can be carried out entirely without manual work. These tasks have been solved thereby that at the side of the pontoon facing away from the netted bag there is provided a stand, being tapering in a direction upwards for supporting a freely rotatable platform, to which is articulatedly attached a boarding gangway, and that a sinker having water as ballast is provided at the lower en of the netted bag, which sinker and thereby also the bottom of the netted bag can be lifted to the water surface by blowing the tanks of the sinker.
DESCRIPTION OF THE DRAWINGS
The invention will hereinafter be described with reference to the drawings, which show some embodiments.
FIG. 1 shows a section through a breeding plant according to the invention,
FIG. 2 shows the breeding plant according to FIG. 1 in a view from above,
FIG. 3 shows in smaller scale a sid
REFERENCES:
patent: 3653358 (1972-04-01), Fremont
patent: 4003338 (1977-01-01), Neff et al.
patent: 4086874 (1978-05-01), Sterner
patent: 4108102 (1978-08-01), Lindstrom
Dennison Caroline D.
Farmocean AB
Murtagh John E.
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