This video shows a common sampling practice of Nile tilapia, Oreochromis niloticus in earthen ponds in Egypt. The attraction to feed is used in the sampling whereas feed is thrown into the pond preferably in the same feeding time and at the same feeding spots. As seen in the video, the sampling was carried out and repeated by two workers in about two minutes using a relatively short seine. The video indicates that the mesh size of this seine was chosen to retain various sizes of tilapia that coexist in the pond. It is believed –based on field observations- that sampled tilapia; in particular Nile tilapia (Oreochromis niloticus) may avoid coming into the feeding spots for a day or two after sampling. Hence, excessive sampling (frequencies) should be avoided.
