| 摘要 |
PURPOSE: To obtain a special feed capable of including an indispensable compo nent for breeding fishes having low heat stability in the feed and surely orally administering a vaccine or a medicine to the bred fishes. CONSTITUTION: This pisciculture feed processed to a cylindrical body by using an extruder is obtained by forming a double layered form inside the cylinder using a different material from the material constituting the cylindrical body. Both ends of the cylindrical body may be sealed off. As the extruder, preferably that having a double screw is used. By supplying another material different from the feed raw material using a conveying means different from the double screw extruder through a die into the cylindrical body which is obtained by supplying the feed raw material to the die using the double screw extruder, the cylindrical body where inside material is different from the outside as the double layered form is simultaneously formed and produced. It is possible to improve the function of expansion pellets. |
