Vessels with measures to prevent bilge and ballast water discharge
Measurement answer
What this metric measures
Number and proportion of organization-operated and/or source/supplier vessels with measures in place to prevent discharge of bilge and ballast water.
Specification
Metric specification
- Result format
- Structured table
- Unit
- number and % — source-defined reporting unit
- Reporting basis
- Reporting period
- Aggregation
- Report the number and proportion (%) of vessels or source/supplier vessels with measures in place.
- Pillar
- Environmental
- Topic
- Changes to nature: mitigation hierarchy steps
- Controlled domain
- Materials, circularity and waste
- Entity type
- Metric
Reporting boundary
Vessels operated by the reporting organization and, where applicable, source/supplier vessels within the fishing value-chain boundary.
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
- Additional sector guidance – Fishing v1.0 (June 2025), p.88, Table 17, official code F.A23.0. | Additional sector guidance – Fishing v1.0 (June 2025), p.88, Table 17, F.A23.0
- Adopting DisclosureF.A23.0
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2025
- Requirement
- Recommended
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- Additional sector guidance – Fishing v1.0 (June 2025), p.88, Table 17, F.A23.0
Value structure
Dimensions and units
- Unit
- number and % — source-defined reporting unit
- Reporting basis
- Reporting period
Unit meaning: Values use number and % under the disclosed TNFD sector-guidance method, reporting period and boundary.
Table fields and units
- vessel population
- number of vessels with measures in place
- proportion of relevant vessels with measures in place (%)
- measure type
- organizational or source/supplier status
Published dimensions
- vessel relationship: organization-operated vessel or source/supplier vessel
- preventive-measure status: measures in place
- measure type: prevention of bilge discharge, ballast water discharge, or both
Calculation method
Formula information
- Status
- Specified
- Formula type
- Percentage
Formula
P = (N / V) × 100Apply the source-defined TNFD sector-guidance method within the stated reporting boundary. The official additional-sector metric provides a reportable count and proportion with an identifiable vessel population. It is distinct from general water-discharge volume metrics and from cruise or marine-transport ballast-water implementation profiles because its applicable sectors, vessel boundary, and combined preventive-measure construct differ.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
P | Proportion of relevant vessels with measures in place | Percentage of the defined vessel population that has measures in place to prevent discharge of bilge and/or ballast water. | % |
N | Vessels with measures in place | Number of organization-operated or source/supplier vessels in the defined population with qualifying preventive measures in place. | number |
V | Relevant vessel population | Total number of organization-operated or source/supplier vessels in the disclosed denominator population. | number |
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
- Additional sector guidance – Fishing v1.0 (June 2025), p.88, Table 17, official code F.A23.0. | Additional sector guidance – Fishing v1.0 (June 2025), p.88, Table 17, F.A23.0
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Vessels with measures to prevent bilge and ballast water discharge”.
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 vessel population used as the denominator, including whether it comprises organization-operated vessels, source/supplier vessels, or both.
- Describe the measures treated as preventing bilge and/or ballast water discharge.
- Disclose the treatment of vessels with unknown, incomplete, or unverified measure status.
- State the organizational and value-chain boundary and any supplier-coverage limitations.
Record-specific limitations
- The source specifies the number and proportion of relevant vessels but does not prescribe a universal technical standard for qualifying preventive measures.
- The source permits either organization-operated vessels or source/supplier vessels; the selected population and value-chain coverage must be disclosed.
- The source does not prescribe treatment of vessels for which measure status is unknown.
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.