© 2020, The Author(s). Spawning strategies of lowland river fishes include single spawning, where reproduction generally occurs in early spring to provide 0+ fish with an extended growth season through the summer, but with a high risk of stochastic mortality events occurring, such as early summer floods. This risk can be reduced by multiple or protracted spawning strategies, where 0+ fish are produced over an extended period, often into mid-summer, but with the trade-off being a shorter growth season. The spawning strategies of cypriniform fish were explored in the River Teme, a spate river in Western England, which has non-indigenous European barbel Barbus barbus present. Sampling 0+ fish in spring and summer and across three spawning periods, B. barbus, chub Squalius cephalus and minnow Phoxinus phoxinus always revealed multiple spawning events, with 0+ fish of < 20 mm present in samples collected from June to August. Fish below 20 mm in August remained relatively small by the end of their growth season (October). For dace Leuciscus leuciscus, only single spawning events were evident, but with 0+ dace always being relatively large. Therefore, multiple spawning appears to be a common strategy that provides resilience in 0+ fish against stochastic mortality events in lowland rivers.

中文翻译：

---

低地河流中鲤形鱼类的产卵策略

© 2020，作者。低地河流鱼类的产卵策略包括单次产卵，繁殖通常发生在早春，为 0+ 鱼提供整个夏季延长的生长季节，但发生随机死亡事件的风险很高，例如初夏洪水。这种风险可以通过多重或长期的产卵策略来降低，其中 0+ 鱼在很长一段时间内生产，通常到仲夏，但代价是生长季节更短。鲤科鱼类的产卵策略在英格兰西部的一条连绵河流 Teme 中进行了探索，该河流存在非本土的欧洲巴布斯巴布鱼。在春季和夏季以及跨越三个产卵期对 0+ 条鱼进行采样，B. barbus、chub Squalius cephalus 和鲦鱼 Phoxinus phoxinus 总是显示出多次产卵事件，6 月至 8 月收集的样本中存在 0+ 条小于 20 毫米的鱼。到生长季节（10 月）结束时，8 月份 20 毫米以下的鱼仍然相对较小。对于 leuciscus leuciscus dace，只有单个产卵事件是明显的，但 0+ dace 总是相对较大。因此，多次产卵似乎是一种常见的策略，可以为 0+ 鱼提供抵御低地河流中随机死亡事件的弹性。