**10. Oceans upwelling**

Ascending motions caused due to oceanic circulation is well-known as 'Upwelling', which bring into being some affects to the environmental conditions, beside increases the nutrient content in euphotic zone thus increasing the productivity of the province. Noteworthy findings [63] suggested various factors inducing upwelling off the south west coast of India [64], also have worked to come across the occurrence of the upwelling route along the Dakshina Kannada Coast of India and description shows that upwelling was found to occur from month of March to October along the coast this could be one of the factor for occurrence HABs along the southwest coast of India.
