Post-harvest Change in ATP-related Compounds Concentration in the Tail Muscle of Deep-water Mud Shrimp Solenocera melantho Caught by Bottom Trawl

摘要

Post-harvest freshness of trawl-caught deep-water mud shrimp Solenocera melantho was assessed by measuring the concentration of ATP-related compounds in theねilmuscle. In the field study, trawls were towed touching the seabed to catch the shrimps for15 min, and then the tows were continued off the seabed for 35 and 65 min to prevent more shrimps being caught and to simulate trawling with S. melantho in the codend at the towing speed of 2.0 knots. Underwater video camera was connected to record the behavior of the catches inside the codend during towing. S. melantho were stored on ice for 5 days after harvesting. S. melantho were observed to move toward to the codend, and continued to be stationary without moving after reacning the codend during thetrawling. The concentrations of ATP-related compounds during the storage were not different significantly in the tow duration of 35 and 65 min. ATP were found when the catches were retrieved from the codend on the deck of the vessel. Decomposition speedof ATP is high, and AMP and IMP were accumulated during the storage. The onset of HxR was observed after 2-day storage, and Hx was not found during the storage of 5 days.