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

本試驗探討以人類絨毛膜促性腺激素及鮭魚性釋素類似物誘導短鰭黃臘鰺產卵的效果。以HCG 1000-1600 IU/kg BW及Ovaprim 0.3 ~ 0.5 cc/kg BW的劑量催熟蓄養在箱網中的短鰭黃臘鰺種魚 (體重2.8 ~ 7.6 kg)，每次催熟120 ~ 180尾，在2 ~ 3月間，共催熟4次。催熟後10 ~ 16.5 h可開始第一次產卵，每次注射後，種魚產卵2 ~ 3日次，產卵量介於數百萬至數千萬間，差異甚大，有效卵介於55 ~ 75% 間。受精卵為圓型、浮性卵，卵徑約為1 mm，大部份受精卵為多油球，在水溫24 ~ 25.5 ℃、鹽度35 psu下，經32 h 45 min 受精卵開始孵化，剛孵化的仔魚全長為2.75 mm，6日齡3.63 mm，14日齡6.63 mm，20日齡平均全長9.46 mm，40日齡平均全長38.84 mm，80日齡平均全長89.42 mm。26日齡的仔魚體色除背鰭為黑色外，其餘體色已和成魚銀白色的體色相似。本試驗顯示，以純化的激素HCG 混合sGnRH-A＋Dom注射短鰭黃臘鰺可穩定獲得受精卵。

This study investigated the efficacy of induced spawning in snubnose pompano, Trachinotus ovatus by injection of human chorionic gonadotropin (HCG) and salmon gonadotropin releasing hormone-analogue (sGnRH-A)+Domperidone (Dom) (Ovaprim). Four groups of snubnose pompano, 120~180 fish (2.8~7.6 kg) in each trial, were injected HCG and ovaprim with dosage of 1000~1600 IU/g BW and 0.3~0.5 cc/kg BW, respectively, during February and March. Spawning occurred at 10~16.5 h after hormonal treatment with 2~3 spawning days in each trial. Markedly difference in egg production ranged from several millions to several ten millions in every trial with viable eggs ranging from 55~75%. Eggs are spherical and buoyant with diameter of 1 mm. Most of fertilized eggs contain multiple oil globules. At water temperature of 24~24.5℃ and salinity of 35 ppt, fertilized eggs hatched at 32 h and 45 min after fertilization. The total length of newly-hatched larvae is 2.75 mm, and follow-up 3.63, 6.63, 9.46, 38.84 and 89.42 mm at 6, 14, 20, 40 and 80 days old, respectively. The fry is similar to the adult fish with the silver body color except the black dorsal fin at 26 days old. Optimum concentration of clove oil for anesthesia of snubnose pompano is 15 ppm. In this study, fertilized eggs of snubnose pompano can be steadily obtained by hormonal treatment of HCG and sGnRH-A+Domperidone.