Auditing fish escape prevention systems under IFA Aquaculture v6

What the requirement is, and why it exists

Under the GLOBALG.A.P. Integrated Farm Assurance version 6 for Aquaculture standard, containment integrity and escape prevention are mandatory environmental safeguards. Section AQ 07 and Section AQ 20 establish comprehensive rules requiring producers to prevent the accidental release of farmed aquatic species into local marine or freshwater ecosystems. Criteria AQ 07.03.01 and Criteria AQ 20.09.02 classify escape prevention and emergency contingency planning as Major Must requirements, demanding complete compliance across all registered production sites.

Escaped farmed stock poses significant ecological threats to surrounding aquatic environments and wild populations. Escaped fish may compete with indigenous species for food and breeding grounds, transmit pathogens, or disrupt local genetic diversity through interbreeding. Establishing rigorous containment structures, net testing protocols, and incident reporting procedures protects regional biodiversity while safeguarding the commercial viability of aquaculture operations.

Compliance leads, quality managers, and internal auditors must ensure that physical containment systems align with documented maintenance logs and risk assessments. Criteria AQ 07.01.01 mandates a documented wildlife management action plan that explicitly aims for zero escapes. When farms utilize third-party diving teams or specialized net repair contractors for underwater inspections, management must also follow rules for managing high-risk subcontractor audits to maintain full regulatory oversight.

Structural risk assessments and mooring maintenance rules

Preventing fish escapes begins with structural engineering tailored to site-specific environmental conditions. Criteria AQ 20.06.04 mandates that net pens and mooring systems must be designed, specified, and installed based on a documented site risk assessment. The risk assessment must evaluate local weather patterns, extreme wave heights, current velocities, and historical flood levels to ensure that holding structures withstand extreme environmental stresses.

The standard enforces strict accountability for installation and ongoing structural care. Criteria AQ 20.06.04 requires producers to maintain written specifications for all cages and anchors, alongside documented records identifying the qualified individuals or external companies responsible for installation. Furthermore, technical maintenance plans must track the regular servicing of anchors, shackles, and grid lines, including detailed records of any replaced structural parts.

Net integrity testing, mesh verification, and inspection workflows

Individual net management represents the primary physical barrier against stock loss. Criteria AQ 20.06.02 requires that every net in use must be individually identifiable with a unique tracking code or tag. Managers must maintain individual net service logs detailing age, structural condition, anti-fouling treatments, cleaning dates, current site location, and net strength testing results conducted according to manufacturer guidelines.

Mesh size selection must prevent stock escape while avoiding welfare hazards. Criteria AQ 20.06.03 dictates that recorded net mesh sizes must be suitable for the specific size of the farmed stock, including any cohabitant cleaner fish species. In addition, net integrity must be visually verified through a documented inspection workflow:

• Execute routine visual inspections of net panels, ropes, and seams at frequencies established in the site risk assessment or manufacturer instructions.
• Conduct immediate underwater or surface visual integrity checks following any severe weather event, predator attack, or industrial operation.
• Record all diver observations, remotely operated vehicle camera footage, and net cleaning activities in dedicated maintenance registers.
• Action and log immediate physical repairs whenever net wear, chafing, or mesh tears are detected during routine monitoring.

Example

During an annual audit of a marine salmon farm operating ten net pens, the certification body auditor examined net maintenance records and escape logs. The auditor discovered that while routine diver logs were kept, pen nets four and seven lacked individual identification tags, and no post-storm inspection was recorded after a gale two weeks prior. In addition, the site escape contingency plan omitted required statutory reporting templates. The auditor issued two Major Must non-conformances under Criteria AQ 20.06.02 and Criteria AQ 07.03.01.

To resolve the non-conformances, the quality team tagged all net pens with permanent stainless steel identification markers and conducted a complete diver inspection. Management updated the site escape SOP to include mandatory post-storm inspection checklists and statutory reporting templates covering biomass and fish health data. The updated records were submitted to the certification body, successfully closing the non-conformances.

Before your audit

• Verify that the environmental management plan contains a written escape contingency plan aiming for zero escapes under Criteria AQ 07.03.01.
• Confirm that engineering calculations demonstrate cage infrastructure suitability for high flood levels and severe weather events.
• Check that every net pen in water is individually identifiable and supported by a complete service life history under Criteria AQ 20.06.02.
• Ensure net strength test certificates from manufacturers or accredited testing facilities are current and available on site.
• Audit diver inspection logs and remotely operated vehicle records to verify post-storm integrity checks were conducted.
• Review depth measurement records to confirm that suspended pen nets never touch the benthic seabed under Criteria AQ 20.06.01.
• Inspect mooring maintenance logs to verify regular anchor, chain, and grid inspections by qualified personnel under Criteria AQ 20.06.04.
• Confirm that incident reporting procedures specify immediate notification to authorities including biomass, health status, and food safety data.

Questions people ask

What information must be reported to authorities if a fish escape occurs?

Criteria AQ 07.03.01 mandates that escape notifications submitted to statutory authorities must include the total estimated biomass, current health status, and any potential food safety risks associated with the escaped stock. Producers must maintain archived copies of these official reports for auditor review.

How often must net integrity visual inspections be performed?

Under Criteria AQ 20.06.02, net integrity visual inspections must be conducted according to the schedule defined in the site risk assessment or manufacturer guidelines. Crucially, inspections must also occur immediately after any special event, such as a severe storm or predator interaction.

Are net pen mooring systems required to have third-party installation certificates?

Criteria AQ 20.06.04 requires documented evidence of the experience and qualifications of the persons or companies responsible for installing and maintaining cage and mooring systems. While a third-party certificate is not strictly mandatory, the producer must present documented proof of installer competence and engineering specifications.

Reference documents

• GLOBALG.A.P. Integrated Farm Assurance Smart/GFS - principles and criteria for aquaculture, v6.0_Mar23, Section AQ 07, Section AQ 20
• GLOBALG.A.P. Chain of Custody - control points and compliance criteria, v6.1_Nov22, Section CoC-SC 6