摘要
为确定半刺厚唇鱼（ Acrossocheilius hemispinus）仔鱼的饥饿耐受能力及死亡不可逆点（ PNR）,采用实验生态学方法研究了饥饿对半刺厚唇鱼仔鱼摄食、生长、存活及发育的影响.结果表明,在（26．5±3）℃的水温条件下：半刺厚唇鱼仔鱼在5日龄卵黄囊消失并开口摄食,其基本不经历混合营养期,属于极易遭受饥饿胁迫鱼类；仔鱼最高初次摄食率出现在6~11日龄,初次摄食期仔鱼的PNR发生在孵化后第15 d,仔鱼具有摄食能力的时间长达11 d,在到达PNR后部分仔鱼仍能存活3~4 d,其耐受饥饿的能力较强；9日龄饥饿仔鱼全长出现负增长,17日龄绝大多数个体因饥饿而死亡；仔鱼在PNR期未出现“胸角”,而鳔后室萎缩明显和第六条黑色素纵带发育显著滞后可作为鉴别半刺厚唇鱼饥饿仔鱼的重要特征.
In order to determine its starvation tolerance and point-of -no-return （ PNR） , the effects of starvation on feeding, growth, survival and development of Acrossocheilius hemispinus larvae were investigated at the temperature of （26. 5 ± 3）℃ using experimental ecological method. The results showed that： the ini-tial feeding of A. hemispinus larvae occurred at 5 days of age and the yolk sac of the larvae were disappeared almost at the same time, the A. hemispinus larvae, did not experience mixed vegetative period thus it belongs to the fish of highly vulnerable to starvation stress; the highest initial feeding rate of larval emergence was de-tected at the age of 6~11 days, the PNR of the larvae occurred at 15 d after hatching. Results also showed that some larvael have a higher hunger-resistame which with feeding ability of 11 d, and some of them were a-ble to survive for 3~4 d after the PNR; starved larvae exhibited negative growth at age of 9 d when measured in full-length, and most of the starved larvae die at age of 17 d. Larvae in the PNR period did not show“pectoral angle”, while their posterior chamber of the swimbladder shrank significantly, and the development of the 6th black longitudinal bands of these starved larvae was significantly delayed. These characteristics may＆amp;nbsp;be used for identification of larvae of A. hemispinus in starvation.
出处
《集美大学学报（自然科学版）》
CAS
2015年第4期241-248,共8页
Journal of Jimei University：Natural Science
基金
国家大宗淡水鱼类产业技术体系基金资助项目(CARS-46)
福建省属公益类基金资助项目(2014R1102-9)
福建省农业"五新"工程项目(闽发改投资2014482号)
福建省地方品种资源保护类项目
关键词
半刺厚唇鱼
仔鱼
饥饿
不可逆点
摄食
Acrossocheilius hemispinus
larvae
starvation
point of no return （PNR）
feeding
