Author : Abdul Aziz Darwis

Summary : The deterioration of protein and the production of total volatile nitrogen (TVN), trimethylamine nitrogen (TNA-N) and ammonia nitrogen (NH3-N) in common carp (Cyprinnus carpio L.), catfish (Clarias batrachus Jord.), little tuna (Euthynnus alteratus affinis Webr.) and long-finned cavalla (Caranx armatus Forskal) during storage at different temperatures and times and their effect on the quality of the fish, were studied. The rates of protein loss varied between species and at different length and temperature of storage. The TVN and NH3-N contents for all of the four species increased rapidly during storage period. The TMA was not detected in the muscle of common carp and catfish even after prolonged storage. The little tuna and long-finned cavalla contained a large amount of TMA and there increased considerably during storage process.