为了确定条纹锯(Centropristis striata)仔鱼的不可逆点(PNR),作者在温度(22.9±0.8)℃、盐度30~32、DO≥5.0mg/L、pH7.8~8.2,光照强度40~100 Lx条件下,对人工孵化的条纹锯仔鱼开展饥饿胁迫对其存活、摄食、生长的变化规律的试验研究及影响。结果显示,仔鱼在孵化后2 d开口摄食,仔鱼体长开始下降,从内源营养期转入混合营养期,持续1 d;3 d时卵黄囊、油球消失,仔鱼体长增加,进入外源营养期,初次摄食率可达到68.25%。3.5 d时初次摄食率最高达到88.24%,之后初次摄食率逐渐下降,5 d时初次摄食率下降为37.5%,可知条纹锯PNR=5 d。6.5 d时试验组仔鱼全部死亡。结果表明,内源营养期对照组与试验组无显著差异,对卵黄囊与油球的利用率相似。混合营养期,仔鱼体长出现负增长,且试验组负增长速率明显高于对照组。外源营养期,试验组仔鱼体长持续下降,至PNR时体长负增长速率加快死亡率增加,直至全部死亡;对照组仔鱼体长开始增长,死亡率逐渐下降并趋于稳定。条纹锯仔鱼孵出后2~5 d为摄食的关键时期。 In order to determine the irreversibility point (PNR) of larvae of Centropristis striata, the average temperature of the larvae at the temperature of 22.9 ± 0.8 ℃, the salinity of 30 ~ 32, the DO of 5.0mg / L, the pH of 7.8 ~ 8.2, the light intensity of 40 ~ 100 Lx, the experimental study and its effects on the variation of survival, ingestion and growth of hatchling striped Sawdarwes under starvation stress were studied. The results showed that the larvae fed on the opening 2 d after hatching. The larval length of the larvae began to decline. The larval length of the larvae began to drop from the endogenous nutrition period to the mixed nutrition period for 1 d. After 3 d, the yolk sac and the oil ball disappeared, Source of nutrition period, the initial feeding rate can reach 68.25%. At 3.5 d, the initial feeding rate reached 88.24%. After that, the initial feeding rate gradually decreased and the initial feeding rate dropped to 37.5% at 5 days. At 6.5 d all the larvae of the experimental group died. The results showed that there was no significant difference between the control group and the experimental group during the endogenous nutrition period, and the utilization rates of the yolk sac and the oil ball were similar. During the mixed nutrition period, the body length of the larvae showed negative growth, and the negative growth rate of the experimental group was significantly higher than that of the control group. During the exogenous nourishment period, the body length of the experimental group continued to decline. At the PNR, the rate of body length negative growth accelerated and the mortality rate increased until all died. The body length of the control group started to grow and the mortality rate gradually decreased and stabilized. Striped Saw 2 ~ 5 days after hatching a critical period of ingestion.