Abstract
Observation of the behavior of fish stocks can reveal very important information that may greatly improve the efficiency and accordingly, the economy of the production operations. Knowledge and information regarding these points are not regularly found in most of the available literature. Farmers, technicians and growers, compared to scientists, have usually better opportunities to observe fish behavior and its changes during the whole production cycle (egg-egg). These observations are not usually recorded or published and the useful knowledge usually kept by farmers as own special production information. Observing and considering the behavior and the associated morphological changes can very much help improving production efficiency in tilapia hatcheries and maximizes production of fry per unit space and number of breeding stocks.
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