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In order to evaluate the biodegradability of bait used in the pot for swimming crab, water tank experimentswere conducted. Mackerel is the most commonly used natural form of bait to catch the swimming crabs, andtherefore was used in this experiment for the biodegradability according to the manufacturing process of thebait. From the biodegradability test on chemical oxygen demand(COD), total nitrogen(TN), totalphosphorus(T P), ammoniac nitrogen, nitrite nitrogen and nitrate nitrogen per unit weight of the bait basedon the production rate and the accumulated amount of pollutants, it was concluded that the smaller the sizeof the mackerel pieces, the higher the production rate and accumulated amount of organic matter andnutrients which was unfavorable to water pollution. The amount of pollutants released from the intestine ofthe tuna was similar with that from the whole mackerel. For the operation period of 111 days, theaccumulated concentrations of tested pollutants from the tuna which were 67.3 mgCOD/gd, 86.4 mgTN/g d, 3.1 mgTP/g d, were almost half comparing with those from the mackerel which were 65.794.4 mgCOD/g d, 83.8 109.4 mgT N/g d, 3.1 5.2 mgT P/g d. The amount of pollutants releasedfrom the intestine of the tuna was slightly less than that from the mackerel that was cut into 8 pieces. butmore than that from the mackerel which was not cut into pieces. Therefore, it can be concluded that the keyfactor in determining water pollution potential is not the kind of bait, but the processing or preparationmethod used. Key words : Biodegradability, Swimming crab, Pot, Bait, Water tank experiment

Evaluation of biodegradability according to bait type for crab pots