Abstract The AEFishBIT tri-axial accelerometer was externally attached to the operculum to assess the divergent activity and respiratory patterns of two marine farmed fish, the gilthead sea bream (Sparus aurata) and European sea bass (Dicentrarchus labrax). Analysis of raw data from exercised fish highlighted the large amplitude of operculum aperture and body tail movements in European sea bass, which were overall more stable at low-medium exercise intensity levels. Cosinor analysis in free-swimming fish (on-board data processing) highlighted a pronounced daily rhythmicity of locomotor activity and respiratory frequency in both gilthead sea bream and European sea bass. Acrophases of activity and respiration were coupled in gilthead sea bream, acting feeding time (once daily at 11:00 h) as a main synchronizing factor. By contrast, locomotor activity and respiratory frequency were out of phase in European sea bass with activity acrophase on early morning and respiration acrophase on the afternoon. The daily range of activity and respiration variation was also higher in European sea bass, probably as part of the adaptation of this fish species to act as a fast swimming predator. In any case, lower locomotor activity and enhanced respiration were associated with larger body weight in both fish species. This agrees with the notion that selection for fast growth in farming conditions is accompanied by a lower activity profile, which may favor an efficient feed conversion for growth purposes. Therefore, the use of behavioral monitoring is becoming a reliable and large-scale promising tool for selecting more efficient farmed fish, allowing researchers and farmers to establish stricter criteria of welfare for more sustainable and ethical fish production.

中文翻译：

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从鳃和体尾运动到养殖金头鲷和欧洲鲈鱼身体活动和呼吸频率的不同耦合。关于水产养殖生物传感的见解

摘要 AEFishBIT 三轴加速度计外部连接到鳃盖，以评估两种海水养殖鱼类、金头鲷 (Sparus aurata) 和欧洲鲈鱼 (Dicentrarchus labrax) 的不同活动和呼吸模式。对来自运动鱼的原始数据的分析强调了欧洲鲈鱼的鳃孔和身体尾部运动的幅度很大，它们在中低运动强度水平下总体上更加稳定。自由游动鱼的余弦分析（船上数据处理）突出了金头鲷和欧洲鲈鱼的运动活动和呼吸频率的明显日常节律。金头鲷的活动和呼吸的高峰期是耦合的，将摄食时间（每天 11:00 小时）作为主要的同步因素。相比之下，欧洲鲈鱼的运动活动和呼吸频率异相，清晨活动处于高峰期，下午呼吸处于高峰期。欧洲鲈鱼的日常活动范围和呼吸变化也更高，这可能是这种鱼类适应快速游泳捕食者的一部分。在任何情况下，较低的运动活动和增强的呼吸与两种鱼类的体重较大有关。这与在养殖条件下选择快速生长伴随着较低的活动特征的观点一致，这可能有利于用于生长目的的有效饲料转化。因此，行为监测的使用正在成为选择更高效养殖鱼类的可靠和大规模有前途的工具，