Technical University of Denmark, National Institute of Aquatic Resources, Kavalergaarden 6, DK-2920 Charlottenlund, Denmark.
Lab Anim. 2011 Oct;45(4):240-6. doi: 10.1258/la.2011.011013. Epub 2011 Jul 19.
The current study investigated how the gastric evacuation rate (GER) was affected after surgically introducing dummies of a blood flow biotelemetry system into the abdominal cavity of Atlantic cod, Gadus morhua. Gastric evacuation experiments were performed two and 10 days postsurgery on surgically implanted and control G. morhua force-fed sandeel, Ammodytes tobianus. The results were compared with previously obtained estimates from unstressed conspecifics voluntarily feeding on a similar diet. After two days, GER was significantly lower in the group of fish with the dummy implants compared with the control group, but following 10 days of recovery no significant difference was seen between the two groups. The difference between implanted and control fish observed two days postsurgery may have resulted either from surgery, postsurgical stress and/or the presence of the implant. The conclusion is that 10 days of postsurgical recovery will stabilize GER in G. morhua, thus indicating that at this point the implant per se did not affect GER. Both the fish with surgical implants and controls in this study evacuated their stomachs much slower and with much higher interindividual variation compared with G. morhua feeding voluntarily on similar prey items. The lower GER and higher interindividual variation for force-fed fish indicate that handling, anaesthetization and force-feeding impair GER and that individual fish respond differently to the suppressing effects.
本研究调查了在大西洋鳕鱼（Gadus morhua）的腹腔中引入血流生物遥测系统的模拟物后，胃排空率（GER）是如何受到影响的。在手术后两天和十天，对接受手术植入和对照的大西洋鳕鱼进行了胃排空实验，这些鱼被强制喂食了毛鳞鱼（Ammodytes tobianus）。结果与以前从自愿以类似饮食进食的未受应激的同种鱼获得的估计值进行了比较。两天后，植入模拟物的鱼的 GER 明显低于对照组，但在 10 天的恢复期后，两组之间没有明显差异。手术后两天观察到的植入组和对照组之间的差异可能是由手术、手术后的应激和/或植入物的存在引起的。结论是，10 天的手术后恢复期将使大西洋鳕鱼的 GER 稳定下来，这表明此时植入物本身不会影响 GER。在这项研究中，无论是接受手术植入的鱼还是对照组，它们排空胃的速度都比自愿以类似猎物为食的大西洋鳕鱼慢得多，个体间的差异也大得多。强制喂养的鱼的 GER 较低且个体间差异较大，表明处理、麻醉和强制喂养会损害 GER，并且个体鱼对抑制作用的反应不同。
