University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA; University of California Davis, Davis, CA, USA.
University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA.
Sci Total Environ. 2022 Feb 1;806(Pt 3):150542. doi: 10.1016/j.scitotenv.2021.150542. Epub 2021 Sep 25.
Pelagic fish embryos are thought to float in or near surface waters for the majority of their development and are presumed to have little to no control over their mobility, rendering these embryos at high risk for damages associated with surface stressors such as ultraviolet radiation (UVR). We recently challenged these long-standing paradigms by characterizing a potential mechanism of stressor avoidance in early-life stage mahi-mahi (Coryphaena hippurus) in which embryos sense external cues, such as UVR, and modify their buoyancy to reduce further exposure. It is unknown whether embryos of other marine fish with pelagic spawning strategies have similar capabilities. To fill this knowledge gap, we investigated buoyancy change in response to UVR in three additional species of marine fish that utilize a pelagic spawning strategy: yellowfin tuna (Thunnus albacares), red snapper (Lutjanus campechanus), and cobia (Rachycentron canadum). Embryos of all three species displayed increased specific gravity and loss of buoyancy after exposures to environmentally relevant doses of UVR, a response that may be ubiquitous to fish with pelagic embryos. To gain further insight into this response, we investigated recovery of buoyancy, oxygen consumption, energy depletion, and photolyase induction in response to UVR exposures in at least one of the three species listed above.
远洋鱼类胚胎在其发育的大部分时间里被认为是在表层水或附近的水域中漂浮，并且它们的移动能力可能很小或几乎没有控制，这使得这些胚胎面临着与表层胁迫物相关的损害的高风险，如紫外线辐射 (UVR)。我们最近通过描述大眼金枪鱼 (Coryphaena hippurus) 早期生命阶段的一种潜在的应激回避机制来挑战这些长期存在的范式，其中胚胎感知外部线索，如 UVR，并改变其浮力以减少进一步暴露。目前还不清楚是否具有远洋产卵策略的其他海洋鱼类的胚胎具有类似的能力。为了填补这一知识空白，我们调查了另外三种利用远洋产卵策略的海洋鱼类对 UVR 的浮力变化反应：黄鳍金枪鱼 (Thunnus albacares)、红鲷鱼 (Lutjanus campechanus) 和军曹鱼 (Rachycentron canadum)。所有三种鱼类的胚胎在暴露于环境相关剂量的 UVR 后，比重增加，浮力丧失，这种反应可能对具有远洋胚胎的鱼类普遍存在。为了更深入地了解这种反应，我们调查了在上述三种鱼类中的至少一种中，对 UVR 暴露的浮力恢复、耗氧量、能量消耗和光解酶诱导的反应。
