Exhibit 31.4

Certification Pursuant

To 18 U. S. C. Section 1350,

As Adopted Pursuant To

Section 302 of the Sarbanes-Oxley Act of 2002

I, Jole Deal, Chief Financial Officer certify that:

1. I have reviewed this annual report on Form 10-K/A of Cyanotech Corporation;

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

Date: August 27, 2015	/s/ Jole Deal
	Jole Deal Vice President—Finance & Administration and CFO  (Principal Financial and Accounting Officer)