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Seasonal index it is an important indicator to study seasonal variations in any studied phenomena which change regularly in an interval less than one year. Seasonal variations are one of components of time series beside secular trend, cyclical or periodical variations, and accidental variations, so to study seasonal variations we must exclude the other variations. So it is important to find out the relation between fish catch and fish prices "Seasonal Index" to all resources of natural fisheries in Egypt, because these fisheries are affected many variable factors, which reflect the difficult of control the fish catch from Natural Fisheries, to know if the fish catch from this fisheries are totally economic, or need to apply more development programs to be in economic production. ARTICLE INFO ABSTRACT Article History: Received: July 8, 2019 Accepted: Dec. 27, 2019 Online: Jan. 2020

Seasonality of Fish Catch and Fish Prices in Natural Egyptian Fisheries