| 摘要: |
| 体征表征动物个体的健康状况,影响个体的体型及其生殖价值。乌贼(Sepia officinalis)营终生一次繁殖产卵,但性腺发育成熟个体的体征变化过程尚未可知。为此,本研究利用残差指标分析方法,对毛里塔尼亚外海分布的乌贼成熟个体的体征及其与体型、摄食强度关系进行了分析研究。结果显示,乌贼雌性成熟个体胴长范围为138~323 mm,雄性成熟个体胴长范围为135~343 mm;两者胴长呈单峰值区间分布,体质量与胴长呈显著的幂函数关系,幂函数拟合b值小于3。雌性、雄性成熟个体的体征存在一定的波动变化但不显著,在功能性成熟产卵期仍保持较好状态。同时,体征与胴长没有显著的函数关系,但是与胃饱满度密切相关,胃饱满度越高、体征越好;并且雌性、雄性成熟个体的空胃率比较低,在14%~34%之间。结果表明,毛里塔尼亚外海乌贼成熟个体保持个体生长,通过正常的摄食活动保持较好的体征。 |
| 关键词: 乌贼(Sepia officinalis) 生长发育 体征 胃饱满度 毛里塔尼亚 |
| DOI：10.11759/hykx20210419001 |
| 分类号:S937.3 |
| 基金项目:国家自然科学基金(41876144);上海市人才发展资金项目(2020107) |
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| The body condition of mature common cuttlefish (Sepia officinalis) from the offshore area of Mauritania |
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ZHANG Ming-xing1, LIN Dong-ming2,3,4,5
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1.Department of ship management, Shanghai Ocean University, Shanghai 201306, China;2.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;3.Key Laboratory of Sustainable Exploitation of Oceanic Fishery Resources, Shanghai Ocean University, Ministry of Education, Shanghai 201306, China;4.National Distant-water Fisheries Engineering Research Center, Shanghai Ocean University, Shanghai 201306, China;5.Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
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| Abstract: |
| Body condition is an important determinant of an organism's fitness, and the association of body condition with subsequent fertility links with that of the final reproductive success. Sepia officinalis is characterized by semelparous reproduction and goes to die shortly after spawning. However, it is yet a lack of information about the body condition of S. officinalis, which in turn limits our understanding of the species' reproductive biology. In this study, S. officinalis were randomly collected from the offshore area of Mauritania and the mature specimens were selected for analyses. The body condition was calculated as the standardized residuals of body weight-mantle length relationship by using the methodology of residual index analyses. Female S. officinalis were measured mantle length (ML) from 138 mm to 323 mm, and males ranged from 135 mm to 343 mm. A unimodal mode was found in the size distribution of mantle length for both females and males, and the body weight was significantly regressed on the mantle length with the power function, being the coefficient b less than 3. The body condition of each sex was not significantly related to mantle length, but instead correlated with the stomach fullness degree, in which the body condition showed better condition at higher stomach fullness degree. Both sexes also showed relatively low ratio of empty stomach, being a range of 14%-34%. Therefore, these lines of evidence demonstrated that S. officinalis off Mauritania exhibits negatively allometric growth after the attainment of sexual mature, and keeps body condition through active feeding behavior. |
| Key words: Sepia officinalis growth body condition stomach fullness degree Mauritania |
