Japanese Spanish mackerel Scomberomorus niphonius is a target species for stocking, but its biological characteristics at the juvenile stage are not well understood. Here, we investigated the high-temperature and starvation tolerances of hatchery-reared juveniles in captivity. We used juveniles of approximately 40 mm standard length, the size of juveniles released into the field. The upper incipient lethal temperature (50% lethal water temperature) was estimated to be 31.8 °C, higher than the maximum sea surface temperature in the field (approximately 29 °C). The critical thermal maximum was 34.8 °C, whereas it was 36.1 °C when juveniles were preliminarily acclimated to 31 °C for 24 h. Juveniles died from 3 to 11 days under nonfeeding conditions at 20 °C, but from 2 to 7 days at 27 °C. This information is expected to contribute to the development of the production of juvenile Japanese Spanish mackerel.

日本西班牙鲭鱼Scomberomorus niphonius是放养的目标物种，但其在幼年期的生物学特性尚未得到很好的了解。在这里，我们调查了人工饲养孵化场饲养的幼鱼的高温和饥饿容忍度。我们使用标准长度约为40毫米的少年，这种少年被释放到野外。估计最高初期致死温度（50％致死水温）为31.8°C，高于田间最高海面温度（约29°C）。临界热最大值为34.8°C，而当青少年预先适应31°C 24 h时，临界热最大值为36.1°C。在20°C的非喂养条件下，幼虫死亡3至11天，而在27°C的条件下，幼虫死亡2至7天。