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        <link:definition>0010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</link:definition>
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        <link:definition>0015 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
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        <link:definition>0020 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
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      <link:roleType roleURI="http://www.cyanotech.com/role/CashFlows" id="CashFlows">
        <link:definition>0030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>9999 - Document - Document and Entity Information</link:definition>
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        <link:definition>1010 - Disclosure - BASIS OF PRESENTATION</link:definition>
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        <link:definition>1020 - Disclosure - INVENTORIES, NET</link:definition>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureEquipmentAndLeaseholdImprovementsNet" id="DisclosureEquipmentAndLeaseholdImprovementsNet">
        <link:definition>1030 - Disclosure - EQUIPMENT AND LEASEHOLD IMPROVEMENTS, NET</link:definition>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureAccruedExpenses" id="DisclosureAccruedExpenses">
        <link:definition>1040 - Disclosure - ACCRUED EXPENSES</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureLineOfCredit" id="DisclosureLineOfCredit">
        <link:definition>1050 - Disclosure - LINE OF CREDIT</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureLongTermDebt" id="DisclosureLongTermDebt">
        <link:definition>1060 - Disclosure - LONG-TERM DEBT</link:definition>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureShareBasedCompensation" id="DisclosureShareBasedCompensation">
        <link:definition>1080 - Disclosure - SHARE-BASED COMPENSATION</link:definition>
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        <link:definition>1070 - Disclosure - LEASES</link:definition>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureIncomeTaxes" id="DisclosureIncomeTaxes">
        <link:definition>1090 - Disclosure - INCOME TAXES</link:definition>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureEarningsPerShare" id="DisclosureEarningsPerShare">
        <link:definition>1100 - Disclosure - EARNINGS PER SHARE</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.cyanotech.com/role/DisclosureNewAccountingPronouncements" id="DisclosureNewAccountingPronouncements">
        <link:definition>8000 - Disclosure - NEW ACCOUNTING PRONOUNCEMENTS</link:definition>
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