Taxation, commercial fishing, ad valorem tax exemption for vessels and equipment, sales and use taxes exemption for bait, levy of excise tax at a rate differential of one and one-half percent on purchase and storage of vessels and machinery used for commercial fishing, Secs. 40-9-1, 40-23-1, 40-23-4, 40-23-37, 40-23-60, 40-23-63 am'd.