Is there still any cormorant fishing going on in Tongli - and are they active year-round?

I'm planning to take the family to Shanghai in early January, and I'm interested in watching cormorant fishing in Tongli (no Guilin on the itinerary this time). However, I am not sure whether there is still any fisherman/woman in that practice and whether they are active in winter time too. And what time of the day are they doing it? Are there any day-tours from Shanghai that will look at that? Or would you recommend I find my own way onto TL?