Along the Pacific coast of the Baja California Peninsula (Mexico), abalone represents one of the most lucrative fisheries. As wild populations are currently depleted, abalone farm production aims to balance the decreasing populations with the increasing demand. The Mexican abalone aquaculture is almost entirely based on red abalone (Haliotis rufescens). However, the increasing frequency of extreme temperature events is hampering this activity. The use interspecific hybrids can potentially improve abalone culture, as species have differences in their thermal tolerance. Therefore, the hybrid progeny between H. rufescens (♀) and pink abalone H. corrugata (♂), a temperate and a warmer water abalone species, respectively, will naturally support higher temperature. To test this hypothesis, growth rate, mortality and metabolic rate of both pure (RR) and hybrid abalone (RP) were assessed under the H. rufescens’ optimum (18 °C) and thermally stressed (22 °C) conditions. To unveil the molecular pathways involved in the heat response, transcriptional profiling of both crosses was also investigated. At high temperature, we observed constrained growth and survival in RR while RP showed a significant increase in both rates, supporting the improved performance of the hybrid compared. These results match with the transcriptional profiling of hybrids showing higher expression of genes involved in growth and calcification, whereas in the pure red progeny, the transcriptional profile was mainly associated with the regulation of necroptosis process. Our results may contribute to propose new management plans to increase farm abalone production in Baja California.

在下加利福尼亚半岛（墨西哥）的太平洋沿岸，鲍鱼是最赚钱的渔业之一。由于目前野生种群已枯竭，鲍鱼养殖场的生产旨在平衡减少的种群和不断增加的需求。墨西哥鲍鱼养殖几乎完全以红鲍（Haliotis rufescens）为基础。然而，极端温度事件发生频率的增加阻碍了这一活动。使用种间杂交种可以潜在地改善鲍鱼养殖，因为物种的耐热性存在差异。因此，H. rufescens (♀) 和粉红鲍H. corrugata的杂交后代(♂)，温带鲍鱼和温水鲍鱼种类，自然会支持更高的温度。为了验证这一假设，在H. rufescens'下评估了纯鲍鱼 (RR) 和杂交鲍鱼 (RP) 的生长率、死亡率和代谢率。最佳 (18 °C) 和热应力 (22 °C) 条件。为了揭示参与热反应的分子途径，还研究了两个杂交的转录谱。在高温下，我们观察到 RR 的生长和存活受限，而 RP 显示出两种速率的显着增加，支持了混合动力车的性能改善。这些结果与杂种的转录谱匹配，显示参与生长和钙化的基因表达较高，而在纯红色后代中，转录谱主要与坏死性凋亡过程的调节有关。我们的结果可能有助于提出新的管理计划，以增加下加利福尼亚州的养殖鲍鱼产量。