| 中文摘要 |
條紋小鲃Puntius semifasciolatus（Günther, 1868）為台灣西部常見之小型淡水魚類，兼具生態與觀賞之價值，但近年來由於棲地破壞與環境污染等問題，使其族群量日益減少。本實驗藉由人工催熟與自然產卵的方式進行條紋小鲃繁殖試驗，並進行育苗觀察與記錄，以瞭解條紋小鲃之繁殖過程、生殖習慣性與魚苗成長過程，期望逐步建立條紋小鲃之基礎生物學資料，並應用於自然環境中之復育或人工繁養殖。條紋小鲃大部分將卵產於水生植物根系，魚卵煩口徑約1.2mm，屬於沈性帶黏性卵，在水溫26-28℃的環境中約19-22hr孵化，初孵化魚苗全長約為3.5mm，孵出第3天可開始攝食餌料；第10天已可清楚觀察到背鰭，臀鰭也開始發育；第20天腹鰭開始發育；第30天可清楚觀察到鱗片，此時與成魚的外表形態類似。
The half-striped Barb Puntius semifasciolatus (Günther, 1868) is a small native freshwater fish inhabiting in brooks and small lakes of the western Taiwan. Due to environmental deterioration resulted from water pollution, habitat destruction, and introduction of exotic fishes, its population has been gradually declining and becoming rare or extinct in many parts of its original ranges. We induced spawning of the fish in the laboratory with injecting a mixed solution of grounded carp's pituitary glands and LRHA, and then, observed its spawning habit and examined its embryonic and larval developments at water temperatures of 26-28℃. The fertilized eggs had diameters of 1.2 mm in average. They developed to the stages of gastrula at 4-5 HAS (hours after spawning) and of embryos with myotome at 8-9 HAS and with heart beats and otoliths at 10-11 HAS. The larvae were hatched at 19-22 HAS. Newly hatched yolk- sac larvae had total lengths at an average of about 3.5 mm. The larvae started feeding on 3 DAH (days after hatching), and had well developed dorsal and anal fins on 10 DAH, pelvic fins on 20 DAH, and scales on 30 DAH. |
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