凯伦藻藻华在全球范围内频发，引起了世界各国的广泛关注。胡氏凯伦藻(Karenia hui)为2024年发表的凯伦藻属新种，初步研究发现具有较高的毒性，但目前对该种的研究非常有限。本文通过研究胡氏凯伦藻的生长特性、对卤虫(Artemia salina)的急性毒性作用，以及不同生长阶段的溶血活性，旨在揭示该藻的生长特征、对卤虫的毒性效应以及溶血活性的变化规律。研究结果表明胡氏凯伦藻具有特殊的双生长周期，即在经历初次指数生长期和稳定期后，会再次进入第二次指数生长期和稳定期。胡氏凯伦藻在整个生长周期均对卤虫具有毒性，特别初次稳定期，其对卤虫致死率高于其他生长时期，且卤虫的致死率与藻密度呈正相关。胡氏凯伦藻的溶血活性在首次指数生长期升高，并在该期末达到峰值(14.4×10^-6 HU/cells)，随后在首次稳定期开始下降，在第二次指数生长期和稳定期内的藻细胞溶血活性较低(0.3×10^-6 HU/cells)。本论文研究结果可为评估和预防胡氏凯伦藻藻华带来的潜在生态风险提供理论基础。

Karenia blooms occur frequently worldwide, attracting extensive attention from countries around the globe. K. hui, a newly identified species of the genu Karenias, has been preliminarily found to have high toxicity. There is currently very little research on this species. This paper investigates the growth characteristics, acute toxicity on Artemia salina, and the hemolytic activity at different growth stages, aiming to reveal the growth features of K. hui, its toxic effects, and the patterns of hemolytic activity variation. The results indicate that K. hui has a unique double growth cycle, characterized by an initial exponential growth phase followed by a stable phase, which is then followed by a second exponential growth phase and another stationary phase. Throughout its entire growth cycle, K. hui exhibits toxicity to Artemia salina, with the algae in the initial stationary phase showing a higher lethality rate to Artemia salina than in other cultivation periods. Moreover, the lethality rate of Artemia salina is positively correlated with the concentration of the algae. The hemolytic activity of K. hui increases during the first exponential growth phase, reaching its peak at the end of this phase (14.4×10-6 HU/cells), begins to decline during the first stationary phase, and remains low during the second exponential growth phase and stationary phase (0.3×10-6 HU/cells). The results of this study can provide a foundation for assessing and mitigating the potential ecological risks posed by K. hui blooms.