PRELIMINARY OBSERVATIONS ON THE ARTIFICIAL HATCHING AND EMBRYONIC DEVELOPMENT OF HUANGHAI HERRING

1.Mature eggs of the Huanghai Herring (Clupea pallasi C.&V.)have the shape of a ball, being demersal and adherent.Egg membrane possesses of irregular fold and yolk is rough, alveolar and short of oil drops.Eggs have a diameter of 1.42-1.54mm. and yolk 1.04-1.18mm. 2.At mean water temperature of 7.4℃, the fertilized eggs begin to divide in 4 hrs.,forming blastule in 14 hrs.,archenteron in 33 hrs.,neurula in 48 hrs., tail bud stage in 99 hrs.and hatch in 279 hrs. 3.New hatched larvae s body mensures 5.24-6.82mm. in length, its head bends down and anus is situated in the hinder part of the body. There are 12 pairs of stellate melanocyte situaled from the hinder margin of yolk to the ventral sides around the anus,a massive melanin spot on each side under the pectoral fin. 4.The postlarva's body is slender. There are 77-83 pairs of myomerie, 28 pairs of melanocytes on each ventral side, three groups of melanin spots on the pectoral fin and some melanian asterisks around the chorda dorsalis of caudal fin in 4 days postlarvae. The melanocytes on each ventral side become smaller and degenerated in 14-16 days after hatching.