| 摘要: |
| 于2009—2010年对山东荣成天鹅湖盛产的长蛸进行了人工繁育研究。采用显微观察和数码拍照等方法, 观察其胚胎发育, 详细描述各发育期的特征。结果表明, 在室温21—25℃、盐度28—31等条件下, 长蛸产卵量9—125粒, 个体间差异较大。卵长径13—20mm, 宽径4—6mm。雌体具护卵行为。胚胎发育期72—89d, 分别历经卵裂期、囊胚期、原肠期、器官形成等20个时期。整个发育过程, 胚胎发生两次翻转, 第一次发生在第Ⅵ—Ⅶ期, 约21d; 第二次发生在第XIX期, 约65d, 少数个体也存在多次翻转现象。初孵幼体胴背长8.5—11.5mm, 全长25—31mm, 直接营底栖生活。 |
| 关键词: 长蛸, 繁殖习性, 胚胎发育 |
| DOI：10.11693/hyhz201301024024 |
| 分类号: |
| 基金项目:国家海洋公益性行业科研专项项目, 200805069 号, 201305043 号 |
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| STUDIES ON THE REPRODUCTIVE HABIT AND EMBRYONIC DEVELOPMENT OF OCTOPUS MINOR UNDER THE ARTIFICIAL CONDITIONS |
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QIAN Yao-Sen1, ZHENG Xiao-Dong1, LIU Chang1, WANG Pei-Liang2, LI Qi1
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1.Fisheries College, Ocean University of China;2.Mashan Group Co. Ltd.
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| Abstract: |
| Octopus minor(Sasaki, 1920) is one of the most important economic cephalopods in China. Artificial reproduction was studied during the period of 2009—2010 in the Swan Lake of Rongcheng, Shandong Province. The results showed that egg length of O. minor was 13—20mm in long diameter and 4—6mm in short diameter. The number of spawned eggs ranged from 9 to 125. The females had the behavior of protecting eggs. The embryonic development lasted for 72—89 days before hatching under the conditions of the seawater temperature of 21—25℃and the salinity of 28—31. The process of embryonic development was divided into 20 stages by characteristic changes, such as cleavage, blastula formation, gastrula formation, organ rudiment formation as well as twice embryo reverses. The first reverse took place on StageⅥ—Ⅶin the Day 21, and embryos turned from animal pole to vegetal pole. The second one happened on Stage XIX in Day 65. And more than twice reverses were also observed. The mantle length and total length of hatching larvae were 8.5—11.5mm and 25—31mm, respectively. The larvae lived benthic directly. |
| Key words: Octopus minor, Reproductive habit, Embryonic development |
