WHEN another misty dawn breaks over the placid waters of Thakuran in the Sundarbans these days, there is frenzied activity among the fishermen of Jata island. The sturdy charcoal-black trawlers and smoky mechanised boats are loaded with provisions, the large tapered fishing nets are spanked into shape, and the families are given the customary farewells. It's time to sail the rivers which zigzag through luxuriant mangrove forests into the Bay of Bengal for another fortnight-long fishing trip.