The Fishery Conservation Zone (FCZ) off the coast of Texas has been closed to shrimping since 1981 (from mid-May to mid-July) to coincide with the closure of the Texas territorial sea. These areas were closed to increase the size of commercially harvested brown shrimp. The econometric analysis of brown shrimp supply-demand relationships for three shrimp sizes (small - more than 67 tails per pound~ medium - 31 to 67 tails per pound~ and large - less than 31 tails per pound) estimated the changes in ex-vessel prices asso- ciated with simulated changes in landings. The estimated 0.4 million pound increase in landings due to the FCZ closure resulted in an increase in revenue of

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