Importance of experienced thermal history: Effect of acclimation temperatures on the high-temperature tolerance and growth performance of juvenile marbled flounder
Importance of experienced thermal history: Effect of acclimation temperatures on the high-temperature tolerance and growth performance of juvenile marbled flounder
复制标题
经历热历史的重要性：驯化温度对幼年大理石牙鲆的高温耐受性和生长性能的影响
DOI：
10.1016/j.jtherbio.2020.102831
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发表时间：
2021
影响因子：
2.7
通讯作者：
Tomiyama Takeshi
中科院分区：
文献类型：
--
作者：
Sakurai Gento;Takahashi Satoshi;Yoshida Yusei;Yoshida Hiroshi;Shoji Jun;Tomiyama Takeshi
经历过的热历史往往会影响鱼类的耐温性；然而，热历史对生长性能的影响尚不清楚。为了促进有效的放养(在野外释放孵化的幼鱼)，我们用大理石比目鱼幼体(约30 mm标准长度和0.3 g体重)在12℃和24℃驯化约2周进行了4个实验室实验，以研究驯化温度对高温耐受性、食物消耗和生长性能的影响。24℃的驯化提高了对高温的耐受性，这一点在24小时暴露实验和升温实验中得到了证明。12℃和24℃驯化组的50%致死温度(上起始致死温度)分别为25.9℃和29.0℃。在随后的实验中，我们测试了高低温驯化对在14℃~23℃温度范围内饲养的两个规格组(28.7℃±2.0℃和34.5℃±22.9 mm，平均摄食温度)幼鱼的摄食量和生长性能的影响。最适生长温度为20℃，驯化温度之间和不同规格组之间没有差异。然而，急剧的温度变化抑制了食物消耗和生长性能。具体地说，在14℃下，24℃驯化组的摄食和生长低于12℃驯化组，接近野外放生时的自然水温。这些结果表明，经历过的热史不影响幼体的最适温度，但会影响幼体的生长性能。为了最大限度地促进孵化养殖幼鱼的放飞后生长，应考虑热史的影响，并应避免放飞前的剧烈温度变化。
Experienced thermal history often affects the temperature tolerance of fish; however, the effect of thermal history on growth performance is unclear. To contribute to effective stocking (release of hatchery-reared juveniles in the field), we conducted four laboratory experiments using juvenile marbled flounder (Pseudopleuronectes yokohamae, around 30 mm standard length and 0.3 g body wet weight) acclimated at 12 °C and 24 °C for approximately 2 weeks to investigate the effects of acclimation temperature on high-temperature tolerance, food consumption, and growth performance. The acclimation to 24 °C increased tolerance to high temperatures, as shown in a 24-h exposure experiment and in a temperature elevation experiment. The 50% lethal temperature (upper incipient lethal temperature) was estimated to be 25.9 °C and 29.0 °C for the 12 °C and 24 °C acclimation groups, respectively. In subsequent experiments, we tested the effects of high and low temperature acclimation on the food consumption and growth performance of two size groups of juveniles (28.7 ± 2.0 and 34.5 ± 2.9 mm, mean ± SD), that were reared at temperatures ranging from 14 °C to 23 °C. The optimal temperature for growth was 20 °C and did not differ between the acclimation temperatures or between the size groups. However, food consumption and growth performance were suppressed by acute temperature changes. Specifically, feeding and growth were lower in the 24 °C-acclimated group than in the 12 °C-acclimated group when exposed to 14 °C, which is close to the natural water temperature at release in the field. These results suggest that experienced thermal history does not affect the optimal temperature but can affect the growth performance of juveniles. To maximize the post-release growth of hatchery-reared juveniles, the influence of thermal history should be taken into consideration and acute thermal changes before release should be avoided.