<![CDATA[The aim of the study was to obtain the information of the gonadal development i.e ovary and oocyte of the hybrid between female patin jambal (Pangasius djambal) and male patin siam (Pangasianodon hypophthalmus). The gonadal development was investigated monthly by dissection of fish samples with 225.2-2,238.6 grams of body weight. Observations were carried out visual-macroscopically for shape, colour, and size of the ovaries. The visual-microscopically observations were carried out for both whole oocyte and ovarian histological slides. The results showed that the ovaries were very small, look alike short lobes. Its colour were grey-redish, very fatly, some of which were rudimentary, with gonadosomatic indices (GSI) ranged 0.05-0.92%. The most advanced stage of ovarian development was stage II (developing stage), later developed as regression ovary with major atresia, and never reached mature stage. The intraovarian oocytes developed as stage 1 (chromatin nucleolar and perinucleolar stages) with less than 225 μm in diameter and stage 2 (cortical alveolar and yolk vesicles stages) with 200- 875 µm in diameter, and the most advanced oocyte stage reached stage 2 only. There were no oocytes reached vitellogenesis stage (stage 3, yolk granules stage) neither mature oocyte stage (stage 4, migratory nucleus and hydrated oocyte stages), and showed major atresia, assigned by presence of the atretic oocyte stage (stage 5).]]>
Copyrights © 2008
