In the sudden spurt of unusually heavy fish landings a movement of deep water fishes to the inshore areas were observed and of this unusual landings along the coast during this period are presented. The heavy fish landings were observed for 15 days in landing centres adjacent of Pondicherry whereas it for 2 days in Kovalam region and in Madras. A slight drop in surface water temperature with low oxygen concentration (1.10 to 1.37ml/L) and low temperature (26.2 to 27.2°C) during this period were examined. Analysis of plankton samples showed a a bloom of Chaetoceros sp.in this period
