A new method for the fertilized eggs collection in pond-smelt

For the management in the fishery resource of the pond-smelt (hypomesus trarspacificus nipponesis), in Lake Koyama, the new tecnique was developed for the collection of the fertilized eggs. Methoed : 1) The net-cage fitted with the loading net was placed at the center in the river entered to the pond. 2) The small mesh net (mojiami ; 50 * 200cm) were spread on the bottom of the net-cage. 3) In the net-cage, the female of the anadromous fishes spawned on the net. 4) The Artificial incubation was efficiently carried out with the fertilized eggs. From the results described above, we concluded that the new methoed was useful for the reduction of the labor in the eggs collectionof the pond-smelt.