are you talking about the id number? if so, you can get an addon called IdTip and it will show you the id for anything you hover over ingame. wonderful for working with honorbuddy stuffs
you can also go to wowhead and look at the item=###### in the URL for the item page. An example for the eel bait would be http://www.wowhead.com/item=110293/abyssal-gulper-eel-bait 110293 would be the item ID you would need for the eel bait. This also works for mob IDs. Hope this helps.