碩士 / 國立屏東科技大學 / 水產養殖系所 / 98 / Embryonic and larval development of Platax teira was described and illustrated using optical and dissecting microscope, and the surface microsturctures of the eggs and larvae were observed using scanning electron microscopy (SEM). Fertilized eggs, with a mean diameter of 1.29±0.05 mm (mean±SD) and a range from 1.17－1.32 mm, were spherical, transparent, buoyant and pigmented. Embryonic development lasted 16 hours at 26.2℃. Newly hatched larvae were 2.81±0.24 mm in total length (TL) with 24 (11+13) myomeres and an oil globule in the ventroposterior area of the yolk sac, and had xantophores all over the body. Three days after hatching (DAH) (3.41±0.11 mm TL), the mouth opened and the yolk sac was almost completely absorbed. Nine DAH (5.07±0.94 mm TL), the notochord was slightly flexed, and the hypural bones and caudal fin rays began to develop. Larvae had melanophores scattered on the majority of the body. Twelve DAH (5.51±0.88 mm TL), the dorsal, anal and caudal fins began to separate. The cannibalistic behavior appeared at this stage. Fifteen DAH (7.29±1.90 mm TL), the red bands appeared around the eyes, and the notochord flexion was completed. At 23.8±1.98 mm TL, all fins had the adult complement of rays and spines, and the characteristic of this species, with 3 black bars on the sides, was completed in juvenile. The larval habitat shifted from the surface to the tank bottom. Under the scanning electron microscopy, fertilized egg was spherical and smooth. The pores on the egg surface were uniform in size and were protrudent, with a density about 36/100 μm2. The pores that were in the micropyle region were larger than in the other regions, and surrounded the micropyle in an orderly manner. The micropyle was cylinder shape, about 8.5 μm in diameter. There were many short stick-like fertilization cones inside the micropyle. There was no scale on newly hatched larvae, and the skin was covered with minute tubercles. Three DAH, the minute tubercles were significantly reduced in number. The mouth was open with no tooth, and there were one spine on the operculum. Four DAH, the teeth started to develop, and a few neuromasts were observed on the body surface. Seven DAH, teeth were fully developed, scales appeared on body surface, and neuromasts began to develop at the lateral line region. Twenty DAH, scales were fully developed, the neuromasts were dense around the lateral line region. This study reveals that larvae have no protection by scales, and neuromasts are developed before 10 DAH, and are fragile when in contact. After 20 DAH, larvae are protected by scales, and are able to be transported.
| Identifer | oai:union.ndltd.org:TW/098NPUS5086001 |
| Date | January 2010 |
| Creators | Ko-Yuan Tai, 戴克遠 |
| Contributors | Chun-Hung Liu, Ming-Yih Leu, Kwee Siong Tew, 劉俊宏, 呂明毅, 張桂祥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 57 |
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