Iowa Code § 481A.76: Unlawful means — exception.

It is unlawful, except as otherwise provided, to use on or in the waters of the state any grabhook, snaghook, any kind of a net, seine, trap, firearm, dynamite, or other explosives, or poisonous or stupefying substances, lime, ashes, electricity, or hand fishing in the taking or attempting to take any fish, except that gaffhooks or landing nets may be used to assist in landing fish. The commission may permit designated fish to be taken by hand fishing, by snagging, by spearing, by bow and arrow, and with artificial light at the times and at the places as determined by rules of the commission.