年轻的鱼 (Oncorhynchus keta) 在迁徙期间偏爱低水温
Arimune Munakata1, Saori Kato1, Ryoka Araya1
1Department of Biology, Miyagi University of Education, Sendai, Japan.
Journal of fish biology
|July 30, 2025
概括
青少年喜欢凉爽水域的鱼体型更大,条件因子更低. 这表明,生长良好的鱼类积极寻求更低的温度,可能会在北太平洋向北迁移.
科学领域:
- 海洋生物学 海洋生物学
- 动物行为 动物行为
- 渔业 科学 渔业 科学
背景情况:
- 日本沿海地区海面温度 (SST) 的上升与化场释放的鱼 (Oncorhynchus nerka) 的存活率下降相关.
- 了解青少年对较冷水的偏好对于预测迁徙模式和在不断变化的气候条件下生存至关重要.
研究的目的:
- 为了研究青少年鱼的低水温偏好和身体形状特征之间的关系.
- 为了识别幼鱼的特征,这些幼鱼积极选择冷水环境.
主要方法:
- 使用具有明显低温和高温区的水箱进行行为实验,以评估幼鱼的水温偏好.
- 在行为试验之前和之后测量青少年的标准长度 (Ls) 和体重 (M).
- 实验后养以监测单独的温度组中的生长速度 (Ls和M) 和条件因子 (K).
主要成果:
- 青少年更喜欢低水温表现出更大的标准长度 (Ls) 和体重 (M),但条件因子 (K) 较低.
- 对于低水温区域,平均Ls和M的选择率在实验试验中增加.
- 低温和高温偏好组在随后的养殖过程中保持了标准长度和体重的增长.
结论:
- 具有较低条件因子 (K) 的生长良好的幼鱼积极表现出对较低水温的偏好.
- 这种冷水的活跃选择可能会影响幼鱼的向北迁移模式,特别是在北太平洋.
- 调查结果突显了SST上升对鱼行为和迁徙的潜在影响.
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