中国水产科学2017，Vol.24Issue(6)：1315-1322,8.DOI:10.3724/SP.J.1118.2017.17002
长江口凤鲚仔稚鱼不同发育阶段矢耳石生长
Sagittal otolith growth and development at different development stages in larval and juvenile Coilia mystus in the Yangtze estuary
摘要
Abstract
Coilia mystus is a very important commercial fish distributed widely in the Yangtze estuary. It is a mi-gratory species which grows and matures in the coastal waters and then naturally migrates into the Yangtze estuary for spawning. Otolith growth and development at different stages in larval and juvenile C. mystus can help to un-derstand their characteristics under natural conditions. An understanding of otolith early growth and development is essential not only for wild population conservation but also for artificial seeding production. In this study, a total of 103 larval and juvenile C. mystus were collected in the Yangtze estuary, from April to August in 2014. Otolith analysis revealed that the age of specimens ranged from 5 to 48 days. To study the early growth and de-velopment of different stages, the body length of 103 individual C. mystus was measured. Statistics showed that the cubic function best described the increase of body length with age. The increase of body length can be divided into three stages, 5-11 d, 12-30 d, and 31-48 d. The growth rate was significantly different among these stages (P<0.05). To study the morphological development, the otolith length and otolith width were measured, and the analysis showed that the increase of otolith length and width increased with body length. After 17 to 19 days, the growth rate increased by about 2-fold. Piecewise regression analysis between otolith length, width, and otolith age was carried out in order to determine the allometric growth pattern, and the inflection point of otolith length and otolith width both occurred at 19-20 days. The growth rate before the knot was slow, while it was rapid after the knot. The otolith morphology of C. mystus changed significantly at different stages in the early life history. The otolith is circular in the yolk-sac and preflexion stages. Otolith length growth is greater than that of otolith width in the flexion stage, and the otolith becomes oval. After the form becomes stable, the ratio of otolith length and width also remains stable.关键词
凤鲚/仔稚鱼/日龄/早期发育/耳石形态Key words
Coilia mystus/larval and juvenile/daily age/early development/otolith shape分类
农业科技引用本文复制引用
张涛,王焕焕,毕学娟,宋超,赵峰,庄平..长江口凤鲚仔稚鱼不同发育阶段矢耳石生长[J].中国水产科学,2017,24(6):1315-1322,8.基金项目
农业部财政专项(CJDC-2017-23) （CJDC-2017-23）
上海市科技兴农重点攻关项目(2017-02-08-00-07-F00075) （2017-02-08-00-07-F00075）
农业部财政专项"2017年长江口重要水生生物产卵场、索饵场调查"项目. （）
