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

本研究之目的為應觀賞魚產業之需求，進行無齒鰺 (Golden trevally, Gnathanodon speciosus) 之人工繁殖試驗研究。無齒鰺受精卵為浮性的透明卵，平均卵徑為 0.91 ± 0.06 mm，內具單一油球，油球的平均直徑為 0.26 ± 0.01 mm。在水溫 25 ± 0.5℃ 及鹽度 32 ~ 33 psu 下，受精卵約 22 小時孵化，剛孵化時仔魚平均全長為 2.73 ± 0.10 mm，第 3 日齡仔魚平均全長為 2.81 ± 0.06 mm，開始投餵小型輪蟲，並添加微藻來穩定水質及滋養輪蟲。第10日齡平均全長為 4.20 ± 0.28 mm，此時仔魚攝食能力增強，可混投橈腳類，同時餌料生物之提供應該注意各種餌料必須重疊使用。第 30 日齡平均全長為 13.76 ± 1.48 mm，此時仔魚可以接受人工飼料。第 100 日齡幼魚平均全長為 100.70 ± 25.02 mm，此時仔魚之體色及斑紋已與成魚一致。

1
1Eastern Marine Biology Research Center, Fisheries Research Institute
2National Museum of Marine Biology and Aquarium
3Institute of Marine Biodiversity and Evolution, National Dong Hwa University
ABSTRACT
This study is aimed to understand the artificial propagation, larval culture of Golden trevally (Gnathanodon speciosus) and other relevant materials. The fertilized eggs of Golden trevally are buoyant and semi-transparent. The pelagic eggs had an average diameter of 0.91 ± 0.06 mm (Mean ± SD). The eggs contain a single oil globule which was 0.26 ± 0.01 mm in diameter. The fertilized eggs hatched at 22 h after fertilization (Temperature = 25 ± 0.5 ℃; salinity = 32 ~ 33 psu). The newly hatched larvae were about 2.73 ± 0.10 mm in total length. Larvae (2.81±0.06 mm) at the 3rd day post hatching (DPH) were given the first feeding with rotifers (Brachionus plicatilis). Adding microalgae (Nannochloropsis oculata) can stabilize water quality and nourish rotifers. The 10 DPH fry ware about 4.20 ± 0.28 mm in total length and copepod was used as feeds, and the supply of feedings should be applied at the same time. The 30 DPH fry ware about 13.76 ± 1.48 mm in total length and could be fed with pellet diet. The pattern of band and color of the 100 DPH juvenile (110.70 ± 25.02 mm) were similar to those of the adult fish.