fishing net
Enable an agent to recognise a fishing net, assess its capture function and physical condition, and determine suitable handling, deployment, repair or retirement actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a fishing net, assess its capture function and physical condition, and determine suitable handling, deployment, repair or retirement actions.
A fishing net is fishing gear made of open-meshed netting arranged to capture fish or other aquatic animals by enclosing, filtering, gilling or entangling them.
It can be Classify the capture mechanism and identify the net panels and rigging that perform it.; Measure mesh and working geometry using an explicitly recorded method.; Assess compatibility with a proposed capture task, environment and deployment system.; Inspect for tears, fouling, tangles and rigging faults before selecting repair or preparation actions.; Identify and check applicable escape features, closures and catch-release arrangements.; Plan retrieval, cleaning, storage or retirement based on condition and the risk of continued capture..
Distinguishing features
Its working capture surface is flexible netting with repeated mesh openings, rather than a solid container wall or a set of baited hooks.
Its intended function includes catching or landing aquatic animals; similar netting used only for sports, cargo restraint or predator exclusion has a different primary function.
Capture depends on the configured mesh surface or mesh enclosure interacting with animals or water flow, rather than mesh being an incidental covering.
A framed landing net remains in scope because flexible netting performs retention; a rigid cage trap requires a neighbouring model even when its walls have mesh-like openings.
A net type describes a capture design, while a physical net has particular dimensions, rigging, wear and repairs; these must not be treated as interchangeable identities.
Scope
+ Capture mechanisms and configurations, including entangling, enclosing, filtering, lifting, casting and landing
+ Mesh construction, netting materials, panel geometry and integral rigging
+ Working dimensions, mesh measurements and configuration-dependent opening geometry
+ Net condition, fouling, damage, repairs and readiness for use
+ Compatibility with deployment equipment and the intended aquatic setting
+ Selectivity, escape provisions, retrieval and prevention of continued capture after loss
- Fishing vessels, winches, cranes and independently managed deployment machinery
- Fishing trips, hauling operations and crew organisation as activities
- Species biology, fish populations and fishery management systems
- Licences, protected-area rules and fishing regulations as authoritative legal records
- Aquaculture cages and barriers whose primary purpose is husbandry or exclusion
- Rigid fish traps, hooks, lines and other capture gear without a net-based capture mechanism
Characteristics
- Capture mechanism
- gilling or entangling; surrounding or enclosing; towing or filtering; lifting; casting; landing; combination Determines which geometry, rigging and handling questions apply.
- Net configuration
- flat panel; multiple overlapping panels; surrounding wall; bag or funnel; cast net; lift net; framed landing net; other documented configuration Separates mechanisms that may use similar netting but form different capture spaces.
- Mesh size by zone
- mm, with mesh geometry, measurement convention, applied tension and wet or dry condition recorded A mesh-size number is not comparable without its measurement method and location.
- Working dimensions
- m for relevant length, depth, circumference, mouth dimensions or bag length, with configuration and loading state Defines the capture envelope and handling requirements without confusing stretched netting with deployed geometry.
- Netting construction
- documented fibre material; monofilament or multifilament; knotted or knotless; mesh shape; twine construction Supports assessment of visibility, flexibility, abrasion response and repair compatibility.
- Hanging ratio
- dimensionless, with mounting direction and ratio convention stated Relates stretched netting to its supporting line and helps explain mesh opening and panel fullness.
- Integral rigging
- associated float lines, weighted lines, frames, rings, bridles, closures and attachment points, each with role and inclusion boundary Identifies the components that establish and preserve the intended fishing shape.
- Deployment mode
- set; drifting; towed; encircling; cast; lifted; handheld; other documented mode Connects the net to the forces and external equipment needed to operate it.
- Capture-surface condition
- intact; torn; abraded; deformed; fouled; tangled; repaired; unassessed, with affected zone and extent Local defects can change retention, selectivity and the likelihood of further damage.
- Operational and recovery state
- stored; prepared; deployed; hauling; recovered; lost; abandoned; retired; unknown Distinguishes readiness and custody from physical condition and identifies recovery needs.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 17 findings · 27 questions.
Capture identity Establishes why the object is a fishing net and how its configuration captures animals.
Fishing nets share mesh construction but differ substantially in capture mechanism and operating boundaries.
Functional boundary
Separates capture netting from neighbouring mesh objects and larger fishing systems.
Net-based capture
Record the intended capture or landing function and the mesh components responsible for it.
- What aquatic capture or landing task is this net intended to perform? definition
- Which parts belong to the net, and which belong to a separate vessel, trap, cage or handling system? boundary
Capture configuration
Connects the net's physical form to its retention mechanism.
Mechanism and form
Describe how panels, bags, frames or closures produce capture without assuming all nets operate alike.
- Does capture occur by gilling, entangling, enclosing, filtering, lifting, casting or landing? definition
- Which features distinguish this configuration from another net type using similar mesh? boundary
Netting and working geometry Describes mesh construction and the geometry achieved when netting is mounted and used.
Mesh openings and working shape cannot be inferred reliably from a nominal size or an unmounted sheet of netting.
Mesh and twine
Characterises the capture surface at the mesh scale.
Mesh measurement and construction
Record mesh size and shape alongside twine construction and the measurement conditions needed for comparison.
- What are the mesh dimensions in each functional zone, and under what tension, moisture condition and measurement convention were they obtained? measurement
- What evidence identifies the fibre, filament construction, twine thickness and knotting method? provenance
Mounted shape
Describes the relationship between panels, mounting lines and the deployed capture envelope.
Panel layout and opening
Record panel arrangement, mounting and relevant working dimensions separately from stretched netting dimensions.
- What panel layout, seams and hanging ratios establish the intended mesh orientation and fullness? definition
- What are the relevant working dimensions, and were they measured laid out, suspended or deployed under load? measurement
Rigging and deployment Connects net shape and capture function to support components, operating forces and handling sequences.
A net's usable configuration depends on how it is supported, moved, opened, closed and retrieved.
Shape control
Identifies the rigging and external forces that establish the working shape.
Support and force paths
Identify how buoyancy, ballast, frames, towing forces or manual support maintain the capture geometry.
- Which floats, weights, frames, lines or external spreading devices maintain this net's working shape? definition
- Where do operating loads enter the net, and what documented limits apply to those attachments? provenance
Setting and hauling
Describes net-specific preparation, deployment and recovery dependencies.
Handling sequence and compatibility
Record the handling sequence and equipment interfaces needed to avoid misdeployment, snagging and uncontrolled entanglement.
- What preparation and setting sequence allows this net to open or spread correctly? action
- Which hauling, release and isolation provisions are needed at its interfaces with people and powered equipment? action
Selectivity and use constraints Records intended catch, unintended capture pathways and context-dependent conditions of use.
A physically intact net may still be unsuitable for a target catch or impermissible in a particular fishing context.
Retention and escape
Connects capture geometry to intended retention and escape opportunities.
Catch profile and selective features
Record intended catch and evidence about selective performance without treating mesh size as a universal predictor.
- Which animals and size ranges are intended to be retained, and what evidence supports that expectation for this configuration? provenance
- Which mesh zones, escape openings or other selective features must be checked before deployment? action
Context of use
Links net characteristics to the proposed location, season and operating conditions.
Applicable use conditions
Associate the net with verified external requirements and documented environmental suitability.
- Which current authoritative requirements apply to this net type, mesh measurement, marking and proposed location and date of use? provenance
- What evidence supports suitability for the proposed depth, current, substrate and deployment duration? provenance
Condition and recovery Tracks defects, repairs and the net's disposition throughout use and retirement.
Net damage can alter capture behaviour, while loss can leave the capture surface active beyond the intended operation.
Inspection and restoration
Assesses netting and rigging defects in relation to the intended configuration.
Defects and repair integrity
Locate damage and establish whether restoration preserves mesh geometry, attachment integrity and selective features.
- Where are tears, broken meshes, abrasion, fouling, tangles or failed attachments, and what is their extent? measurement
- What repair, cleaning or replacement action is appropriate, and how will the restored geometry and integrity be checked? action
Loss and end of use
Addresses retrieval, continued capture after loss and retirement of netting.
Recoverability and retirement
Record identification, recovery provisions and actions that prevent a lost or discarded net from remaining an uncontrolled capture device.
- What identification, position records and retrieval provisions allow this net to be located and recovered? action
- If the net is lost or retired, what feasible recovery or disposal actions address continued capture and loose netting? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The unqualified name is interpreted as a class of fishing gear, not a particular product or individual net.
- Measurement ranges are broad indications, not specifications; mesh opening must be distinguished from stretched mesh size and measured under a stated convention.
- Specific gear classification codes, technical standards and applicable fishing regulations require verification.
- Which of these check these first hold for the sense of fishing net this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Gillnet
- Trammel net
- Trawl net
- Purse seine
- Cast net
- Lift net
- Which of these kinds and varieties hold for the sense of fishing net this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Commercial capture of schooling fish with purse seines.
- Capture of fish and shrimp with towed trawl nets.
- Small-scale and subsistence fishing with cast nets, lift nets and gillnets.
- Scientific sampling of fish populations.
- Harvesting and handling fish in aquaculture.
- Which of these real-world use hold for the sense of fishing net this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Mesh opening - Millimetres to hundreds of millimetres, depending on target species and gear; measurement conventions differ. - mm
- Net length - A few metres for small nets to thousands of metres for some commercial net assemblies. - m
- Which of these typical measurements hold for the sense of fishing net this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Abrasion, snagging and excessive tension can tear meshes or break supporting lines.
- Unintended capture can injure or kill non-target fish, seabirds, turtles and marine mammals.
- Lost or abandoned nets can continue capturing animals, a process called ghost fishing.
- Bottom-contact gear can disturb seabed habitats.
- Lines, netting and hauling machinery can entangle crew or pull them overboard.
- Which of these failure modes and hazards hold for the sense of fishing net this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Net construction, materials and deployment practices vary with local target species, waters and fishing traditions.
- Permitted mesh sizes, net dimensions, gear types and fishing seasons depend on jurisdiction and fishery.
- Which of these regional variation hold for the sense of fishing net this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Fishing trap - A trap retains animals in a chamber with an entrance designed to impede escape; it may incorporate netting without being classified as a fishing net.
- Landing net - A landing net primarily retrieves an animal already caught or controlled, whereas capture nets perform the initial fishing operation.
- Aquaculture cage - A cage confines stocked animals during rearing rather than capturing free-ranging animals.
- Netting - Netting is the mesh material; a fishing net is gear constructed and arranged from it for fishing.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of fishing net this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative gear classification should anchor net-type terminology, especially for bag nets, scoop nets and net components of larger trap systems?
- Which mesh-size and hanging-ratio measurement conventions apply to each included net type, and how should incompatible measurements be represented?
- What evidence supports net-type-specific relationships among mesh geometry, material, target catch and unintended capture?
- Which inspection criteria and repair acceptance limits are defensible for each material and operating load, rather than being assumed across all nets?
- Which jurisdiction-specific marking, selective-feature and loss-reporting requirements must be linked when a particular place and date of use are known?