During the spawning season of Nile tilapia (Oreochromis niloticus) develop reddish coloration as secondary sex characteristics. One of the attached photos shows clearly the male coloration during the spawning season while the second photo shows the color difference between male and female of Nile tilapia.
Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will seek our permission if you wish to use a picture or more. This will be appreciated.
