中文摘要：

本文分析了采集于北太平洋海域的35尾柔鱼（Ommastrephes bartramii）角质颚的微结构,并对其生长纹的周期性进行了验证。研究结果显示：上颚喙部截面由头盖和脊突两部分组成,周期性的生长带明显,每条生长带由明、暗相间的两条生长纹组成。头盖部的生长纹明显比脊突部的清晰,两者交汇于内轴成＂〈＂形。喙部顶端以及后端常有明显的标记轮,其形成与个体发育期的特殊事件以及外界的突发事件有关。角质颚生长纹数目与耳石日龄相当（P〈0.05）,证明柔鱼角质颚生长纹的沉积为＂一日一纹＂。根据角质颚生长纹估算柔鱼的生命周期小于1年,样本胴长、体重和角质颚喙长与日龄呈显著的逻辑斯蒂关系。研究结果不仅为柔鱼类年龄鉴定和生长估算提供新方法,而且为我国头足类学者开展相关研究提供重要基础。

英文摘要：

Based on 35 Ommatrephes bartramii specimens collected from northwest Pacific Ocean, we analyzed the microstructure of upper beak rostrum sagittal section（RSS） and validate the periodicity of the formation of growth increments. RSS are composed of hood and crest, in which light-dark alternated growth increments are distinct. The increments within hood are much clearer than those in crest and they show a pattern of ＂〈＂ when meet together at the region of internal rostral axis. We found that some stress checks in the anterior and posterior parts of RSS might relate to special ontogenetic events or external accident. The formation of beak increments is daily as indicated by general agreement between the number of growth increments in beak RSS and statolith-determined age. The estimated age showed that the length of life of O. bartramii is within 1 year, and the mantle length, body weight, and upper rostrum length follow the Logistic model. Therefore, we hope the results of this study present a new method to determine squid age and growth, and provide an important basis of research on similar cases.