Indian oil sardine on revival path PTI Kochi | Updated on × Indian oil sardine, stock of which was showing a declining trend for the past few years, appears to be on a revival path along the Kerala coast, thanks to a seemingly favourable condition in the marine ecosystem. Scattered batches of immature sardines have been reported from the southern coast of the State due to this condition, the Central Marine Fisheries Research Institute said in a release. However, the CMFRI cautioned against catching these stocks extensively as it may badly affect the expected revival of the fish. Upon assessing the sexual maturity, a team of researchers of CMFRI found that these sardines of 14-16 cm size were yet to reach the reproductive stage.