Life-history and other vital rate information is important for effective species conservation by informing demographic trends and aspects of population viability. However, species-specific information is lacking for many small-bodied freshwater fishes, which can make it difficult to relate demographic trends to threats or recovery actions. Silver Shiner (Notropis photogenis), a small-bodied species listed as Threatened under Canada's Species at Risk Act, lacks well-informed age and vital rate information. We aged 254 Silver Shiner using opercular and otolith structures and determined that Silver Shiner is short-lived, with a probable maximum age of 4. Three years of field collections (2017–2019) were used to parameterize growth models and to estimate adult (age 1–3+) mortality rates. Silver Shiner captured in urban reaches exhibited altered growth and higher mortality compared to non-urban reaches, indicating that urbanization may have demographic impacts on the species. Results highlight the importance of detailed age and vital rate information for assessing threats and informing effective conservation approaches for imperilled fishes. Furthermore, the potential negative impact of urbanization on the growth and survival of this species highlights the urgency of better understanding the influence of urbanization on small-bodied freshwater fishes in general.

中文翻译：

---

城市化与体型小、濒危淡水鱼的生长改变和存活率降低有关

生活史和其他生命率信息通过告知人口趋势和种群生存力的各个方面，对于有效的物种保护很重要。然而，许多小型淡水鱼缺乏特定物种的信息，这使得很难将人口趋势与威胁或恢复行动联系起来。Silver Shiner ( Notropis photogenis )，一种被加拿大濒危物种法列为受威胁物种的小型物种, 缺乏消息灵通的年龄和生命率信息。我们使用鳃盖和耳石结构对 254 Silver Shiner 进行了老化，并确定 Silver Shiner 寿命很短，最大年龄可能为 4。三年的实地采集（2017-2019）用于参数化生长模型并估计成年（年龄1–3+) 死亡率。与非城市地区相比，在城市地区捕获的 Silver Shiner 表现出改变的增长和更高的死亡率，这表明城市化可能对该物种产生人口影响。结果强调了详细的年龄和生命率信息对于评估威胁和为濒危鱼类提供有效保护方法的重要性。此外，