The waste fish oil obtained from Baltic sprat in the production of canned sprats was studied as a sole carbon substrate for PHA synthesis by wild-type strain Cupriavidus necator B-10646. Sprat contained set fatty acids with chain length C14 to C24, saturation factor 0.63, and provided bacterial growth synthesis. Bacteria metabolized unevenly utilizing polyenoic not using monoenoic saturated aci...