The hook needs to be a relatively wide-gap hook in the 2/0 to 4/0-size range for 7- to 8-inch worms. I used three different hook brands and found all to be acceptable. The 2/0 and 3/0 Owner hooks , 2/0 and 3/0 Gamakatsu hooks , and the Eagle Claw Laser Sharp 2/0 to 4/0 hooks are all extremely sharp and have good hook-set capabilities. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.