PURSUANT TO RULE NO. 424(b)(3)
                                          REGISTRATION NO. 333-34941 PROSPECTUS
SUPPLEMENT NO. 7
(TO THE PROSPECTUS DATED OCTOBER 16, 1997)

                     2,300,000 Preferred Securities

                           Hvide Capital Trust

             6 1/2% Trust Convertible Preferred Securities
          (Liquidation Preference $50 per Preferred Security)
                                  and
                            4,176,880 Shares
                        Hvide Marine Incorporated
                          Class A Common Stock
       (Including 4,035,120 Shares Issuable Upon Conversion of the Preferred 
                               Securities)


         This Prospectus  Supplement No. 7 supplements and amends the Prospectus
dated  October 16, 1997 (the  "Prospectus")  relating to the resale of (i) the 6
1/2% Trust Convertible Preferred Securities (the "Preferred Securities"),  which
represent  preferred undivided  beneficial  ownership interests in the assets of
Hvide Capital  Trust,  a statutory  business  trust formed under the laws of the
State of Delaware, (ii) the shares of common stock of Hvide Marine Incorporated,
a Florida  corporation (the  "Company"),  par value $0.001 per share (the "Hvide
Class A Common Stock"),  issuable upon conversation of the Preferred Securities;
and (iii) 141,760  shares of Hvide Class A Common Stock issued by the Company in
connection with an acquisition of certain vessels.

         The  table on  pages  83 and 84 of the  Prospectus,  which  sets  forth
information  with respect to the Selling  Holders (as defined in the Prospectus)
and the respective  amounts of Preferred  Securities  beneficially owned by each
Selling Holder that may be offered  pursuant to the Prospectus (as  supplemented
and  amended)  (the  "Selling  Holder  Table"),  is hereby  amended  so that the
following line item reads as follows:



                                                                                            Shares of Common
                                                                                           Stock Issuable Upon
                                                                     Number of                Conversion of
Selling Holders                                                Preferred Securities     Preferred Securities
                                                                                      
Northern Trust Company.......................................         4,000                     7,018


     The Prospectus,  Prospectus  Supplement No. 1, Prospectus Supplement No. 2,
Prospectus  Supplement No. 3, Prospectus Supplement No. 4, Prospectus Supplement
No. 5,  Prospectus  Supplement  No. 6 and and this  Prospectus  Supplement No. 7
constitute  the  prospectus  required  to be  delivered  by Section  5(b) of the
Securities  Act of 1933,  as  amended,  with  respect to offers and sales of the
Preferred Securities and the Hvide Class A Common Stock issuable upon conversion
of  the  Preferred  Securities.   All  references  in  the  Prospectus  to  "the
Prospectus"  are hereby  amended to read "the  Prospectus (as  supplemented  and
amended)."


         PROSPECTIVE INVESTORS SHOULD CAREFULLY CONSIDER THE MATTERS
         DISCUSSED UNDER THE CAPTION "RISK FACTORS" BEGINNING ON PAGE
                           13 OF THE PROSPECTUS.








THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE SECURITIES  COMMISSION NOR HAVE THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.



            The date of this Prospectus Supplement is March 3, 1999