The eyes of the common carp and Nile tilapia are sensitive to near-infrared

@article{Matsumoto2009TheEO,
  title={The eyes of the common carp and Nile tilapia are sensitive to near-infrared},
  author={Taro Matsumoto and Gunzo Kawamura},
  journal={Fisheries Science},
  year={2009},
  volume={71},
  pages={350-355}
}
Fish biologists have shown little interest in near-infrared (NIR) sensitivity because water absorbs light in the red and near-infrared and because downward irradiance in clear ocean water is mostly blue light. In recent years, however, Nile tilapia Oreochromis niloticus was shown to be NIR sensitive by behavioral techniques. This study confirmed NIR sensitivity in the common carp Cyprinus carpio and Nile tilapia by using a more sensitive technique than a behavioral one. Cardiac conditioning… 

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