Mitamura Hiromichi, Mitsunaga Yasushi, Arai Nobuaki, Viputhanumas Thavee
Graduate School of Informatics, Kyoto University, Japan.
Zoolog Sci. 2006 Mar;23(3):235-8. doi: 10.2108/zsj.23.235.
For conservation and successful stock enhancement of endangered species, an understanding of the movement patterns and behavior of the target species is indispensable. The Mekong giant catfish, Pangasianodon gigas, is endemic to the Mekong Basin and now is threatened with extinction. Although biotelemetry using acoustic transmitters and receivers is expected to reveal its movement patterns and behavior, the most suitable attachment method for the transmitter to the catfish is unknown. In this study we examined the effects of external attachment and surgical implantation on the survival and growth of the catfish, compared with those in control individuals, in an earthen fish pond for approximately 2 months. No fish died during the experimental period. Furthermore, we found no fungal infections in any fish and no significant differences in growth rate among treatment and control fish. However, all transmitters of externally tagged fish were lost during the experimental period. In contrast, transmitters of some surgically implanted fish remained in the peritoneal cavity. In conclusion, the surgical implantation technique is suitable for long-term monitoring of the catfish.
为了保护濒危物种并成功增加其种群数量，了解目标物种的活动模式和行为是必不可少的。湄公河巨鲶（Pangasianodon gigas）是湄公河流域的特有物种，目前面临灭绝威胁。尽管使用声学发射器和接收器的生物遥测技术有望揭示其活动模式和行为，但发射器与鲶鱼最适合的附着方法尚不清楚。在本研究中，我们在土池塘中对鲶鱼进行了约2个月的实验，比较了外部附着和手术植入对鲶鱼存活和生长的影响，并与对照个体进行了对比。实验期间没有鱼死亡。此外，我们未在任何鱼身上发现真菌感染，处理组和对照组鱼的生长速率也没有显著差异。然而，外部标记鱼的所有发射器在实验期间都丢失了。相比之下，一些手术植入鱼的发射器仍留在腹腔内。总之，手术植入技术适用于对鲶鱼的长期监测。
