Human interference in nature is creating a lot of disturbance even in the marine waters, fisheries experts opined. “Fishes which were earlier found only in deep sea are now getting caught from backwaters. Oil sardines and even marine creatures like Octopus have found their way into the backwaters because of the higher salinity in the waters. Vembanadu lake has shrunk to one-third of what it was about a 100 years ago,” said Kerala university of fisheries sciences (Kufos) vice-chancellor A Ramachandran. He said that the fresh water sources have begun to dry up in the land and with the fall in water levels, the sea is pushing into the land. “On the other hand, we are reclaiming wetlands which is having a bearing on the land temperatures,” he said.