| 摘要: |
| 采用显微观察和测绘法对条斑星鲽早期生长发育的数量和形态特征进行了系统的观察和测量。结果表明, 条斑星鲽成熟卵子为悬浮性、端黄卵, 圆球形, 卵径 1.7—1.9mm, 无油球。在水温(9.0±0.5)℃条件下, 受精卵经196.3h 孵化出膜。在水温12—14℃条件下, 7 日龄(DAH, days after hatching)仔鱼卵黄囊消耗殆尽, 开口, 肛门与外界相通, 开始进入外源性营养阶段。仔鱼开口饵料为轮虫, 8 日龄仔鱼开始摄食轮虫, 12 日龄开始摄食卤虫无节幼体, 30 日龄开始进行配合饲料转化, 40日龄后苗种摄食配合饲料良好。生活史无鳔。脊椎骨末端上曲发生在21 日龄, 至28 日龄完成。70日龄幼鱼鳞片和侧线已形成, 鳍条数量与成体完全一致。变态过程: 32 日龄苗种进入变态期, 左侧眼睛开始上移, 42 日龄眼睛转移至头顶, 50 日龄眼睛转到右侧, 完成变态。研究了鳍的发生及生长过程:背鳍、胸鳍、腹鳍、尾鳍、臀鳍分别发生于19、0、20、19、10 天, 至50 日龄幼鱼, 除胸鳍外其它鳍的鳍条数与成鱼一致。
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| 关键词: 条斑星鲽, 胚胎发育, 胚后生长发育, 形态特征 |
| DOI：10.11693/hyhz200906005005 |
| 分类号: |
| 基金项目:国家863 计划项目, 2006AA10A414 号; 农业部公益性行业专项, nyhyzx07-046 号; 农业科技成果转化资金项目,2008GB23260382 号; 鲆鲽类现代产业体术体系项目, xdcytx-50 号 |
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| EMBRYONIC AND POST-EMBRYONIC DEVELOPMENT OF BARFIN FLOUNDER VERASPER MOSERI |
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LIU Xue-Zhou, XU Yong-Jiang, LIU Xin-Fu, CHEN Chao, WANG Yan-Yan, MA Ai-Jun
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Key Laboratory for Sustainable Utilization of Marine Fisheries Resource, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences
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| Abstract: |
| Morphology of barfin flounder Verasper moseri in early life stage were studied; including features of yolk sac larva, preflexion larva, postflexion larva and juveniles. Eggs and semen were stripped from the ovary cavity and sperm ducts by gently compressing the genital area of sexually matured female and male fish. The eggs were fertilized artificially, cultured at (9.0±0.5)℃and salinity 33—35, sampled every 30—60min, and observed with a microscope. The fertilized eggs were 1.7—1.9 mm in diameter, from which embryos were hatched out about 196 h post fertilization. Newly hatched larvae, (4.92±0.29)mm long, were nursed at 12—14℃, which were dependent entirely on the egg-contained energy till 7 DAH (Days After Hatching), with mouth and anus opened; this is termed as mixed feeding stage. After yolk was exhausted at 9 DAH, the development entered exogenous feeding stage. Larvae began to feed in rotifers B. plicatili at 8 DAH, and nauplii of brine shrimp Artemia salina from 13 to 45 DAH. No swim bladder was shown all over the life history. The flexion of notochord started at 21 DAH with total length 8.31±0.23 mm (n=30), and finished at 28 DAH with total length reached (9.32±0.54)mm (n=30). When total length reached 10.22±0.41 mm (n=30), post flexion larvae attained juvenile stage. Metamorphosis began at 32 DAH and completed at 50 DAH, the left eye moved to the right side, the juveniles entered the bottom life stage. At 70 DAH, lateral line formed and total length achieved 30.5±6.62 mm (n=30), the juveniles entered youth stage. Dorsal fin, pectoral fin, pelvic fin, caudal fin, anal fin anlage formed at 19, 0, 20, 19, and 10 DAH, respectively, and were completed after 50 DAH except pectoral fin, 70 DAH instead.
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| Key words: Verasper moseri, Embryonic development, Post-embryonic development and growth, Morphological characters |
