Farmed species escape events
Measurement answer
What this metric measures
Direct-operations disclosure of farmed-species escape events, including escaped individuals and their proportion of total farm stock, with event severity, ecological context and causes.
Specification
Metric specification
- Result format
- Multi-field profile
- Unit
- Structured table — see field-level units
- Reporting basis
- reporting period
- Aggregation
- Report escape-event information by farmed species and event; retain the number of escaped individuals and percentage of total farm stock as separate fields.
- Pillar
- Environmental
- Topic
- Escapes of farmed species and invasive alien species risk
- Controlled domain
- Nature, biodiversity and land
- Entity type
- Metric
Reporting boundary
Direct operations involving farmed species.
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- TNFD additional sector guidance, section 3.2, Table 19: Core sector disclosure indicators and metrics, A.C4.0, p. 73. | Source notes that the metric is adapted from the ASC Salmon Standard. | p.73, Section 3.2, Table 19: Core sector disclosure indicators and metrics, A.C4.0
- Adopting DisclosureA.C4.0
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2024
- Requirement
- Conditional
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- p.73, Section 3.2, Table 19: Core sector disclosure indicators and metrics, A.C4.0
Value structure
Dimensions and units
- Unit
- Structured table — see field-level units
- Reporting basis
- reporting period
Unit meaning: Each field uses its stated unit and retains the applicable sector, reporting boundary, period and method.
Table fields and units
- farmed species
- number of escaped individuals
- escaped individuals as percentage of total farm stock
- event severity
- affected ecosystem
- species at risk
- cause of escape
- extreme-weather linkage
Published dimensions
- farmed species
- escape-event severity: minor, major or catastrophic
- affected ecosystem
- species at risk
- cause of escape
- extreme-weather linkage
Disclosure method
Formula information
- Status
- Not applicable
- Formula type
- Structured Disclosure
Disclosure form
No single formulaReport the source-defined result with its stated fields and method disclosures. This is a standalone TNFD core-sector structured metric for direct operations, identified as A.C4.0. It is not an invasive-alien-species count or area metric: it reports farmed-species escape events and associated event-level context. None of the shortlisted metrics matches its event boundary, fields, units and value shape.
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 30 August 2026
TNFD additional sector guidance collection
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Locator
- TNFD additional sector guidance, section 3.2, Table 19: Core sector disclosure indicators and metrics, A.C4.0, p. 73. | Source notes that the metric is adapted from the ASC Salmon Standard. | p.73, Section 3.2, Table 19: Core sector disclosure indicators and metrics, A.C4.0
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Farmed species escape events”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: TNFD sector guidance, Final English sector guidance collection through August 2026 (17 documents).
- Define the farmed-species population and total farm-stock denominator used for each reported percentage.
- Describe the criteria used to classify escape events as minor, major or catastrophic.
- Describe the method used to identify affected ecosystems, species at risk and causes of escape.
- Identify whether an escape event was linked to extreme weather and state the basis for that determination.
Record-specific limitations
- Counts and percentages measure escape-event occurrence and magnitude; they do not independently establish ecological impact or invasive-species establishment.
- Event severity, affected ecosystems, species at risk and causes are contextual fields and should not be collapsed into a single numeric score.
- The metric is adapted from the ASC Salmon Standard; the TNFD source should be cited for this disclosure and the adaptation should not imply that ASC material is licensed under TNFD's CC BY 4.0 licence.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.