Exhibit 31.2



CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT
OF 2002

(18 U.S.C. SECTION 1350)



I, Kathi Niffenegger, certify that:



| | 1. | I have reviewed this Amendment No. 2 to the Annual Report
on Form 10-K of Stellar Biotechnologies, Inc. for the year ended August 31, 2014;
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| | 2. | Based on my knowledge, the report does not contain any
untrue statement of a material fact or fail to state a material fact necessary to make the statements made, in light of the circumstances
under which such statements were made, and is not misleading with respect to the period covered by the report;
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| | 3. | Based on my knowledge, the financial statements, and
other financial information included in the report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in the report;
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| | 4. | The registrant’s other certifying officer and I
are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)
and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the
registrant and have:
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| | a. | Designed such disclosure controls and procedures, or
caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating
to the registrant, including its consolidated subsidiaries, was made known to us by others within those entities, particularly
during the period in which the report was being prepared;
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| | b. | Designed such internal control over financial reporting,
or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;
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| | c. | Evaluated the effectiveness of the registrant’s
disclosure controls and procedures, and presented in the report our conclusions about the effectiveness of the disclosure controls
and procedures, as of the end of the period covered by the report based on such evaluation; and
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| | d. | Disclosed in the report any change in the registrant’s
internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter covered by the
report (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or was reasonably
likely to materially affect, the registrant’s internal control over financial reporting; and
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| | 5. | The registrant’s other certifying officer and I
disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors
and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
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| | a. | All significant deficiencies and material weaknesses
in the design or operation of internal control over financial reporting which were reasonably likely to adversely affect the registrant’s
ability to record, process, summarize and report financial information; and
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| | b. | Any fraud, whether or not material, that involved management
or other employees who had a significant role in the registrant’s internal control over financial reporting.
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|Date: September 9, 2015 | By: | /s/ Kathi Niffenegger        
|----------------------- | --- | -----------------------------
|                        |     | Kathi Niffenegger            
|                        |     | Chief Financial Officer      
|                        |     | (Principal Financial Officer)