| 摘要: |
| 犬齿牙鲆(Paralichthys dentatus)卵为端黄卵, 受精卵浮性, 卵径950～1 100 μm, 油球径200～225μm。在水温20.5～22.0℃, 盐度33 条件下培育, 受精后1 h 20 min 进入卵裂期, 6 h 10 min 进入囊胚期,11 h 20 min 进入原肠胚期, 19 h 10 min 发育到胚孔封闭期, 胚体形成, 26 h 50 min 尾芽出现, 33 h 35 min心跳开始, 48 h 10 min 开始孵化出仔鱼。初孵仔鱼平均全长2.59 mm±0.02 mm, 在培育水温为17.0～21.0℃, 盐度24～34 条件下, 胚后发育时序为: 1 日龄～9 日龄为仔鱼前期, 10 日龄平均全长5.52 mm±0.05 mm, 卵黄囊和油球完全吸收进入仔鱼后期; 40 日龄平均全长20.82 mm±0.67 mm, 各鳍鳍条发育形成进入稚鱼期; 65 日龄平均全长41.13 mm±0.88 mm, 全身鳞被完整进入幼鱼早期。 |
| 关键词: 犬齿牙鲆(Paralichthys dentatus) 胚胎发育 仔稚幼鱼 形态发育 |
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| 基金项目:福建省科技厅重点资助项目(2007N0015) |
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| Embryonic and larval morphological development of Paralichthys dentatus |
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| Abstract: |
| The eggs of summer flounder were telolecithal egg, and fertilized eggs were buoyant. The average diameter of eggs was 950～1 100 μm. Radius of oil globule was 200～225 μm. The egg was hatched at water temperature 20.5～22.0℃ and salinity 33. The embryos entered cleavage stage by 1 h 20 min after fertilization, entered the blastula stage by 6 h 10 min, entered the gastrula stage by 11h 20min, developed into the blastopore closure stage, embryo was formed. Tail bud appeared by 26h 50min, the heart beat began by 33 h 35 min, and larvae were hatched by 48 h 10 min. The average length of newly hatched larva was 2.59 mm±0.2 mm. At the cultivation temperature of 17～21℃, salinity 24～34, the postembryonic development timing sequence was: the fish of 1 day to 9 days after hatching were prelarva. The average length of 10 days fish was 5.52 mm±0.05 mm, yolk sac and oil globule were absorbed completely, and the fish entered the postlarvae stage. The average length of 40 days fish was 20.82 mm±0.67 mm, fin rays form, the fish entered the larval stage. The average length of 65 days fish was 41.13 mm±0.88 mm, the whole lodicules developed completely, the fish entered early juvenile stage. |
| Key words: Paralichthys dentatus embryonic development larval morphological development |
