Recent growth in striped bass aquaculture has generated interest in broodstock development programs for improved growth, disease resistance and stress tolerance. This research evaluated differential stress responsiveness of captive-bred striped bass originating from Canada, Virginia, Florida and a domestic strain, following a repeated acute stressor. Fish were communally stocked into a six tank recirculating system, and fish in three tanks were net-chased for 1 min two days/week (stressed), and three undisturbed tanks served as controls. After 14 weeks, fish in the control and stressed treatments were chased, and blood collected from all fish in one tank per treatment at 0, 1 and 3 h post-stressor. Growth, cortisol, glucose, haematological indices and selected hepatic gene expression were compared among strains and between treatment groups. To further compare cortisol responsiveness, a second study was conducted with lower net chasing frequency (once/month) and cortisol measured. A cortisol stress response was not detected in Canada fish in either study, but all other strains exhibited similar expression patterns. Differences in plasma parameters, growth and immunocompetence were detected, but no single measure predicted greater growth. These results indicate that strains differ in acute stress responsiveness, which may be useful in selective breeding programs.

中文翻译：

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比较 F1 和驯化的条纹鲈鱼 (Morone saxatilis) 在重复急性应激源后的应激反应

最近条纹鲈鱼养殖的增长引起了人们对提高生长、抗病性和抗逆性的亲体开发计划的兴趣。这项研究评估了来自加拿大、弗吉尼亚、佛罗里达州的圈养条纹鲈鱼和一种在反复急性应激源后的家养菌株的不同应激反应能力。鱼被共同放养到一个六缸循环系统中，三个缸中的鱼被网捕 1 分钟，每周两天（受压），三个未受干扰的缸作为对照。14 周后，在对照和应激处理中的鱼被追捕，并在应激后 0、1 和 3 小时从每个处理的一个罐中的所有鱼中收集血液。比较菌株之间和治疗组之间的生长、皮质醇、葡萄糖、血液学指标和选定的肝脏基因表达。为了进一步比较皮质醇反应性，进行了第二项研究，采用较低的净追逐频率（一次/月）并测量皮质醇。在这两项研究中都未在加拿大鱼中检测到皮质醇应激反应，但所有其他品系都表现出相似的表达模式。检测到血浆参数、生长和免疫能力的差异，但没有单一的测量预测更大的生长。这些结果表明品系在急性应激反应方面不同，这可能在选择性育种计划中有用。检测到生长和免疫能力，但没有单一的措施预测更大的增长。这些结果表明品系在急性应激反应方面不同，这可能在选择性育种计划中有用。检测到生长和免疫能力，但没有单一的措施预测更大的增长。这些结果表明品系在急性应激反应方面不同，这可能在选择性育种计划中有用。