A Wikia sysop is essentially a trusted user who has a few additional options, such as the ability to delete, protect, or block. Someone with particular responsibilities for resolving problems. Wikipedia provides a little more historical information on where the term sysop originated (see [1])
The dedicated sysop for fisherymanagement.wikia.com is currently Tim Adams.
The full list, including Wikia managers, appears at Special:Listadmins.