西江伍氏华吸鳅仔、稚鱼的异速生长研究

Allometric Growth Model of the Larvae and Juveniles of Sinogastromyzon wui in the Xijiang River

运用光学显微镜和实验生态学的研究方法,对伍氏华吸鳅Sinogastromyzon wui仔、稚鱼从出膜到30日龄各器官的异速生长进行研究。结果表明,吻长、眼径、头长、头高、体高和体长均存在异速生长的现象(P<0.05),头部器官比身体其他器官优先发育。吻长和眼径一直保持正异速生长,头长的生长拐点出现在12~13日龄,拐点前后均保持正异速生长,头高的生长拐点在7~8日龄,拐点前是负异速生长,拐点后是正异速生长;体高的拐点出现在15~16日龄,拐点前后均保持正异速生长,吻至肛长一直保持等速生长,体长保持等速生长。头部器官在早期发育阶段优先发育,可以增强捕食和躲避天敌的能力,并有助于为仔鱼期发育提供能量,适应外界环境,提高存活率。本研究可丰富伍氏华吸鳅仔、稚鱼发育过程的基础生物学资料,为育苗生产和野生早期资源的保护提供理论支撑。

The allometric growth of Sinogastromyzon wui from emergence to 30 days was investigated using light micros-copy and experimental ecology.The results revealed that S.wui showed allometric growth(P<0.05)by measuring the ma-jor morphological indices,such as rostrum length,eye diameter,head length,head height,body height and body length.Moreover,the head organs had a higher developmental priority compared to other body organs.Among the head organs,the rostrum length and eye diameter maintained positive allometric growth,and the growth inflection point of head length oc-curred at 12-13 days after birth,with positive allometric growth before and after the inflection point.The growth inflection point of head height occurred at 7-8 days after birth,with negative allometric growth before and positive allometricgrowth after the inflection point.In all body parts,the inflection point of body height occurred at 15-16 days after birth,and posi-tive allometric growth was maintained before and after the inflection point.The rostrum to anal length maintained isokinetic growth,while the body length maintained isokinetic growth.The early developmental stage of the head organs of S.wui prioritised to enhance the ability of predation and avoidance of natural enemies and adaptation to the external environment,and contributed to providing energy for the development of juvenile fish and the improvement of survival rate.This research can enrich the basic biological information of the developmental process of S.wui and provide theoretical support for seed-ling production and conservation of wild juvenile resources.