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Abstract
Amphiprion polymnus is a small-sized marine fish that is often associated with sea anemones in coral reefs, though not as valuable as food but at prices for cultivating in the aquarium is popular because of the colorful color, easy to nourish in the tank. The developmental characteristics of oviductal cavity oocytes distributed in the marine waters of Nha Trang, Khanh Hoa province were studied from January 2014 to December 2014. Analysis of oocyte developing of Saddleback Anemonefish tissue revealed that fish for six phases. The first is the chromatin – nucleus phase, the pre-perinuclear phase and the perinucleus phase, the ovules are rounded and white in the transition to white opaque with increased diameter in the following phases: 21.5 - 97.6μm The 21.5 - 97.6μm; 61.2 - 274.2μm. The corticalization phase, the ovine shape changes to oval, the yolk grows in both length and width but grows faster than dividing the egg into two poles, the size (length) of 611.6 - 800.3μm. Phases of yolk granule, the shape of oocytes change from almost 8 at the end of the corticalization phase to oval with length 887.6 - 1548 , 1μm. At the end of the egg yolk, the nucleus moves toward the animal pole and gradually disappears. The oocytes separate from the follicle in maturation.
Key words: Saddleback Anemonefish, Amphiprion polymnus, oocytes