**Exhibit 31.1**

 

Certification PursuantTo 18 U.S.C Section 1350,As Adopted Pursuant ToSection 302 of the Sarbanes-Oxley Act of 2002

 

IGerald R. Cysewski, Chairman of the Board of Directors, President and ChiefExecutive Officer certify that:

 

1.  I have reviewed this report on Form 10-Q ofCyanotech Corporation;

 

2.  Based on my knowledge, this report does notcontain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered by this report;

 

3.  Based on my knowledge, the financialstatements, and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the registrant as of, and for, the periods presented in thisreport;

 

4.  The registrant’s other certifying officerand I are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for theregistrant and we have:

 

a)Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure thatmaterial information relating to the registrant, including its consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this quarterly report is being prepared;

 

b)Evaluated the effectiveness of the registrant’s disclosure controls andprocedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period coveredby this report based on such evaluation; and

 

c)Disclosed in this report any change in the registrant’s internal control overfinancial reporting that occurred during the registrant’s most recent fiscalquarter (the registrant’s fourth quarter in the case of an annual report) thathas materially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and

 

5.  The registrant’s other certifying officerand I have disclosed, based on our most recent evaluation of internal controlover financial reporting, to the registrant’s auditors and the audit committeeof registrant’s board of directors (or persons performing the equivalentfunction):

 

a)All significant deficiencies in the design or operation of internal controlover financial reporting which are reasonably likely to affect the registrant’sability to record, process, summarize and report financial information; and

 

b)Any fraud, whether or not material, that involves management or other employeeswho have a significant role in the registrant’s internal control over financialreporting.

 

 
| Date:  | August 12,  2003 | /s/ Gerald R. Cysewski                                                          |   |
|--------|-----------------------|---------------------------------------------------------------------------------|--------|
|   |                  |     Gerald R. Cysewski                                      |   |
|   |                  | *Chairman of the Board**of Directors,  President**and Chief  Executive Officer* |   |

 

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