農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

本研究係為因應觀賞魚產業之需求，進行擬刺尾鯛 (Palette surgeonfish, Paracanthurus hepatus) 人工繁殖關鍵技術之研發。當飼育水槽水溫高於25 ℃ 以上時，擬刺尾鯛即開始出現產卵行為，並持續至秋末水溫下降至 25 ℃ 以下時，終止產卵。擬刺尾鯛受精卵為浮性的透明卵，平均卵徑為 0.67 ± 0.05 mm (Mean ± S.D.)，內具單一油球，油球的平均直徑為 0.15 ± 0.05 mm。在水溫 28 ± 1 ℃及鹽度 32 ~ 33 psu下，受精卵約 18 h孵化；在鹽度 25 ~ 35 psu 之間，受精卵之孵化率有顯著差異，其中以30 psu 的 82.5％ 最佳。剛孵化之仔魚平均全長為 1.52 ± 0.05 mm；第 3 日仔魚平均全長 2.29 ± 0.12 mm，開始投餵纖毛蟲等原生動物，並添加微藻來穩定水質；第 7 日平均全長 2.58 ± 0.21 mm，此時可投餵小型輪蟲；第 15 日，平均全長 3.32 ± 0.31 mm，仔魚攝食能力增強，可混投小型橈足類，投餵餌料生物時，應注意各種餌料必須重疊使用；第 20 日，仔魚平均全長為 5.18 ± 0.30 mm，可投餵橈足類或豐年蝦；第 24 日開始可以進行流水養殖；第 26 日仔魚平均全長為 6.20 ± 0.94 mm，開始進入稚魚期階段。

This study aimed to establish the artificial propagation techniques of palette surgeonfish (Paracanthurus hepatus). Their spawning behavior occurred while the water temperature was continuously above 25℃ and termined when the temperature dropped below 25℃. Furthermore, their fertilized eggs are buoyant and semi-transparent. The pelagic eggs had an average diameter of 0.67 ± 0.05 mm (Mean ± SD). They contained a single oil globule which was 0.15 ± 0.05 mm in diameter. The fertilized eggs hatched at 18 h after fertilization (Temp. = 28 ± 1℃; sal. = 32 - 33 psu). Hatching rates of fertilized eggs varied significantly according to changes in salinities. The highest rate (82.5%) was at 30 psu. The newly hatched larvae were 1.52 ± 0.05 mm in total length. Starting at the third day post-hatching (DPH), larvae (2.29 ± 0.12 mm) received the first feeding with ciliate. Microalgae (Nannochloropsis oculata) were added to stabilize the water quality. The 7 DPH fry were 2.58 ± 0.21 mm in total length and were fed with rotifers (Brachionus plicatilis). The 15 DPH fry were 3.32 ± 0.31 mm in total length and the small copepod were used as feeds. Since then the feeding capacity of larvae increased and the supply of different feeds should be applied simultaneously. The 20 DPH fry were 5.18 ± 0.30 mm in total length and could be fed with copepod and artemia. The 24 DPH can start to rear under running water. The 26 DPH fry were 6.20 ± 0.94 mm in total length and began to enter the juvenile stage.