FI89277B - FOER FAR OER MATERIAL FOER INKUBERING AV AEGG OCH LARVER AV FISK OCH KRAEFTDJUR - Google Patents

Description

! 89277

Method and substance for incubating eggs and larvae of fish and crustaceans

The invention relates to a method and an agent for incubating eggs and larvae of fish and crustaceans.

Background 5

In conventional incubation methods, egg / larval mortality increases as a result of shocks and other mechanical stresses. This is a problem for both pelagic (free-floating) and demersal 10 (bottom-living) fish eggs.

Certain types of larvae are very sensitive to mechanical stresses. This is the case e.g. in the halibut flock, where incubation of the larvae before the start-up feed-15 appears to be a problem in chick production.

In some cases, traditional methods require that the salinity of the water be kept at a sufficiently high level because the eggs and larvae would otherwise sink to the bottom. However, from an energy point of view, it is more advantageous to incubate eggs / larvae at a lower salt content, because the organisms then use less energy to regulate the ions.

An additional problem with traditional incubation systems is that eggs / larvae are highly susceptible to fungal and bacterial infections.

In addition, in current systems, it is problematic to keep / direct eggs / larvae stable and calm during gene transfer and vaccination, which e.g. complicates such processing on a large scale.

2 89277

Purpose

The main object of the invention is to develop a method for incubating eggs / larvae of fish and crustaceans, in which the eggs / larvae are protected as much as possible from physical stresses, such as shocks and impulses. Another purpose is to prevent the actual organisms from coming into contact with bacteria and fungi, and in addition, the purpose is to immobilize them so that injection / vaccination can be performed.

Principle of the invention

The basic idea of the invention is set out in claim 1, which at the same time defines the scope of protection. Other advantageous features of the present invention are set out in the subclaims.

Using a suitable gel and injection technique, such organisms may be housed within a capsule or plate to prevent damaging impulses and other unwanted physical exertion.

The diffusion of water can take place almost unimpeded and thus the necessary amounts of oxygen can enter and the secretions can leave.

The gel can be dissolved either by changing the temperature or by rinsing certain ions out of the structure.

30

Example

Encapsulation can be performed in different ways. One possibility is to make spherical capsule-35 ta / gel beads with the target inside the sphere.

Il 3 89277

If an alginate gel is used, the subjects can first be mixed with an alginate solution of the desired consistency and dropped through a tube / pipette into a curing bath.

5 In this way, almost spherical capsules are obtained, the size and physical properties of which can be adapted to suit different needs.

10 Another solution may be to pour the organisms into the gel plates. Such plates can either be cast together with the eggs in a single operation or the plates can be cast separately and the organisms then placed between two plates which are joined together, possibly under pressure. Such plates can, for example, be molded into a shape corresponding to an egg tray.

An additional possibility is to place the organisms in the gel-20 between two dialysis cells. In special cases, the dialysis membrane may completely replace the gel or may optionally be used in combination with another viscose mixture, such as a protein solution or the like.

25

A fourth possibility is to incubate the organisms on a gel strip.

The gel structures can be stored in water or can be placed on a free surface by spraying them with water continuously or intermittently.

The encapsulated larvae / eggs can be stored from fertilization to hatching and possibly further in the brown sac stage.

Claims (7)

Method for incubating eggs / larvae of fish and crustaceans, characterized in that the organisms are stored within a gel or gel-like material. Method according to claim 1, characterized in that the storage medium is manufactured with a relatively hard shell and soft core. Method according to claim 1 or 2, characterized in that the storage medium is manufactured in ball, string or disc form, in the latter case being preferably made with two-tiered "egg dish" for joining eggs / larvae. Method according to claim 1, characterized in that the organisms are stored between two dialysis membranes, possibly in combination with a gel-like solution. Method according to any of claims 1-4, characterized in that the storage medium was added to fungicides and / or bacteria-preventing substances. 6. Material for storing eggs / larvae of fish and crustaceans, characterized in that it comprises sheets of a gel or a gel-like material intended for paired lamination with intermediate eggs / larvae. 7. A material according to claim 6, characterized in that it is designed with pre-cut openings. li