Histological Study about the Ovaries of Several Kinds of Ovoviviparous Teleost

1) Present paper is concerned with the histology of the ovaries of Sebastiscus marmoratus, Sebastichthys Pachycephalus and Sebastiscus albofasciatus, those are ovoviviparous teleost fishes. The ovarian theses fishes ftissue of shows the primitive fitness for the viviparity. So, when the process of the fit ness to this direction is to be studied, these fishes are the first samples which must be treated with. 2) When the ovaries are in the immature stage, the spermatozoa are ejaculated and enter into the ovarian cavities and are reserved there, and penetrate into the liquefacted ovarian tissues after the maturity of oocytes and then the fertilization are performed. 3) The fertilized eggs begin the growth at the original sites in the ovarian tissues, therefore the nutrition for the growth depends mostly upon the reserving yolk in the eggs. It is supposed that the larvae enter the ovarian cavities and are driven out after their growth has fully advanced to be able to swim. 4) At the last stage of the reproductive period, it is often observed in the ovaries that the growth of the larvae has stopped and the large unspawned eggs have been broken down and are being absorbed