Add to that improved but indiscriminate fishing. Fishermen in Bengal have now started adopting a quick-buck method, by which they trap the juvenile hilsa and sell it for as much as Rs 200 in the market. A quick survey of the catch at Fraserganj in south Bengal (which feeds most of the state) last year showed that of every 1,000 fish, only five were adult. Earlier, fishermen used to catch the hilsa with a gill net which had a mesh size of 4 to 4.5 inches. The smaller fish would slip through the gaps. But in the past few years, they have switched to the monofilament ‘disco’ net, which—with a mesh size of only 1.5 to 2 inches—traps even the spawn, thereby preventing it from breeding in the next season. That’s not all. In the winter months of November-March, when the hilsa spawn is swimming out to sea from the river, it’s picked up by dragnets and bag nets attached to trawlers. Either way, the juvenile hilsa are not allowed to grow and breed. Last year, the winter catch yielded over 150 tonnes of young hilsa (called fry or fingerlings). Fisheries department officials estimated that if they hadn’t been trapped, they might have grown to provide over 500 tonnes of hilsa the following year. According to marine biologist and researcher Madhumita Mukherjee, this has killed off many varieties of hilsa, like the slightly dark Chandana hilsa. The common hilsa, or the Tenualosa ilisha, could be on a similar path. Moreover, five years ago fishermen could pick up a decent catch within nine km of the shoreline. Now they often have to travel as far as 30 km out to sea before they can get a decent haul. Yet consumption hasn’t been affected. As with the Calcutta jeweller, the hilsa forms a major part of many promotions. This year, the Sutanuti Parishad, which stubbornly continues to celebrate Calcutta’s birthday—that isn’t—on August 24, organised for a hoard of hilsa through a week of celebrations. "Now even non-Bengalis have begun to develop a taste for hilsa," says a wholesaler. And the state continues to transport five truckloads—or about 20 tonnes—of hilsa to Bengali neighbourhoods like Chittaranajan Park in Delhi, and to pockets in Madhya Pradesh every week. "All things considered, the hilsa is severely threatened," says U.S. Nandy, director of the state fisheries department.