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

花軟唇 Plectorhinchus cinctus 屬石鱸科 Haemulidae，其 受精卵之卵徑介於 0.78 至 0.82 mm 間，為浮性的透明卵，內有單一油球，油球的直徑為 0.21 mm，在鹽度 31 ppt 時，呈半沉浮的狀態。在水溫 26-28℃，鹽度 31 ppt 的條件下，約 21 小時開始孵化。剛孵化不久軀幹伸直時、孵化後 24 及 48 小時的仔魚，全長分別為 1.67 mm、2.6 mm 及 2.8 mm，孵化後第 3 天，約 62 小時，全長為 2.8 mm，開始有攝食的動作。在水溫 26-29C，鹽度 30-32 ppt 下，經 42 天的培育，仔魚的平均全長為 3610.1 mm，平均體重為 0.940.78 g。仔魚在成長的過程，體色有明顯的變化，由孵化後的透明體色逐漸變成黑色，12 日齡時除尾柄及鰭部外，整個軀幹佈滿黑色素，30 日齡時，有些仔魚的體表已經開始出現條紋，顯現出鮮豔的體色。投餵魚苗的餌料，包括巨牡蠣 Crassostrea gigas 的受精卵，輪蟲 Brachionus plicatilis、豐年蝦 Artemia spp.、橈足類 Copepod 及赤尾青 Acetes spp.。
關鍵詞: 花軟唇，初期發育，育苗

Three-banded sweetlip Plectorhinchus cinctus belongs to the family Haemulidae. The fertilized eggs are transparent and their diameters range from 0.78 mm to 0.82 mm. The eggs contain a single globule which has a diameter of 0.21 mm. In salinity of 31 ppt, the fertilized eggs are suspending in the water column. At water temperature of 26-28℃ and salinity of 31 ppt, the larvae hatched at 21 hours after fertilization. The total lengths of the newly hatched larvae, 24 hours and 48 hours old were 1.67 mm, 2.6 mm and 2.8 mm, respectively. The larvae of 2.8 mm in total length were found to start first feeding at about 62 hours after fertilization. At water temperature of 26-29℃ and salinity of 30-32 ppt, the mean total length and body weight of the 42 days old fry were 3610.1 mm and 0.940.78 g, respectively. The body coloration changed with the growth from transparent in newly-hatched larvae to deep black color in 12 days old and turn gradually to yellow-brownish color after one month old. The feeds for larvae include oyster Crassostrea gigas embryos, rotifers Brachionus plicatilis, Artemias spp., copepod and small shrimps Acetes spp.
Key words: Plectorhinchus cinctus, Early development, Larval rearing