عنوان مقاله [English]
There are three species of Kilka fish (Clupeidae) in the Caspian Sea which are known as industrial fish. These fish are valuable because of their biochemical composition. It has been known that the Kilka can be processed to the suitable by-products. Liquid fertilizer or fish silage can be used as a valuable food for feeding animals and poultry. In the present research, the Kilka silage has been made through chemical methods and by using Formic acid in order to prevent bacterial deterioration and to complete for protein autolysis as a result of enzyme activities. The results have shown the biochemical composition of Kilka silage includes 22.34% of protein, 4.48% of fat, 2.78% of ash (or minerals) and 71.52% of moisture. These amounts have changed to 20.16%, 4.01%, 2.69% and 71.90%, respectively on the last day of storage. During storage the changes were not significant. It has also been observed the produced silage was safe as the microbial growth in it was in acceptable amount.