Abstract: Between January and August 2002, a study was undertaken in 69 shrimp farms of three major ownership (individual, group and outside lease) categories to determine the extent of use of biological and chemical products in extensive shrimp farming system in southwest Bangladesh. Farmers in the study area used on an average 5 different biological and chemical products. The most commonly used products were soil and water treatment products (lime and cow dung) to improve culture conditions. Farmers under individual category used an average of 67.34 kg ha ‾ 1 lime, which was lower than the farmers under group category (96.71 kg ha ‾ 1) and the farmers under outside category (74.39 kg ha ‾ 1) respectively. The maximum application of cow dung was 1,058.72 kg ha ‾ 1 used by the outside shrimp farmers. Farmers spent 0.1-0.3% in chemicals, 0.6-1.0% in lime, 1.3-1.4% in organic fertilizer, 0.2-1.4% in inorganic fertilizer respectively of their total production cost in the system. Average farm size, production and cost contribution of the used products are described. Drugs and antibiotics and therapeutants for disease control were not available in the study area.