UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934


                Date of Report (Date of earliest event reported)

                                  March 4, 2005


                          BIOSOURCE INTERNATIONAL, INC.
             (Exact name of registrant as specified in its charter)


     Delaware                           0-21930                  77-0340829
(State or other jurisdiction     (Commission File Number)      (IRS Employer
  of incorporation)                                          Identification No.)


        542 Flynn Road, Camarillo, California                         93012
       (Address of principal executive offices)                     (Zip Code)

       Registrant's telephone number, including area code: (805) 987-0086


Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

[ ]     Written communications pursuant to Rule 425 under the Securities Act
        (17 CFR 230.425)

[ ]     Soliciting material pursuant to Rule 14a-12 under the Exchange Act
        (17 CFR 240.14a-12)

[ ]     Pre-commencement communications pursuant to Rule 14d-2(b) under the
        Exchange Act (17 CFR 240.14d-2(b))

[ ]     Pre-commencement communications pursuant to Rule 13e-4(c) under the
        Exchange Act (17 CFR 240.13e-4(c))





Item 2.02       Results of Operations and Financial Condition.

     On March 4, 2005,  BioSource  International,  Inc. (the "Company") issued a
press release  regarding its financial  results for the fourth  quarter and year
ended  December  31,  2004.  A copy of the press  release is attached  hereto as
Exhibit 99.1 and is incorporated herein by this reference.

     The  information in this report shall not be deemed "filed" for purposes of
Section  18 of the  Securities  Exchange  Act of 1934,  nor  shall it be  deemed
incorporated  by reference in any filing under the Securities Act of 1933 or the
Securities  Exchange  Act of 1934,  except  as shall be  expressly  set forth by
specific reference in such a filing.

Item  9.01      Financial  Statements,  Pro  Forma  Financial  Information and
                Exhibits.

        (a) Financial Statements. None.

        (b) Pro Forma Financial Information. None.

        (c) Exhibits.

            99.1 Press Release dated March 4, 2005, published by the Company.





                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                        BIOSOURCE INTERNATIONAL, INC.


March 4, 2005                           /s/Alan Edrick
                                        ----------------------------------------
                                        Alan Edrick
                                        Executive Vice President and
                                        Chief Financial Officer