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Standardized size-frequency data for Indo-Pacific king mackerel

Reference: 
IOTC-DATASETS-LATEST-SF-GUT
File: 
Package icon IOTC-DATASETS-2026-02-03-SF-GUT-1988-2024.zip
Type: 
Datasets
Year: 
2026
Meeting: 
None
Meeting session: 
0
Availability: 
5 February 2026
Authors: 
IOTC Secretariat
Abstract: 

Each year, the IOTC Secretariat prepares a reference size data set for each IOTC species to provide information on the size composition of their catch in the IOTC area of competence. The data are collected on land by enumerators during unloading and transshipments and at sea by fishers and scientific observers from the IOTC Contracting Parties and Cooperating Non-Contracting Parties (CPCs) as per IOTC data requirements (IOTC Resolution 15/02). The data are submitted on an annual basis, mostly with the forms 4SF, and curated by the Secretariat for dissemination prior to the IOTC working groups.

 

Global attributes

  • Title: Standardized size frequency data available in the IOTC database for Indo-Pacific king mackerel
  • Summary: Curated data set providing information on size composition
  • Context of development: Management of tuna and tuna-like species under IOTC mandate
  • Data origin: Size samples collected on land or at sea by national institutions and fishing industry that may be extrapolated to the fishery
  • Lineage: Formatting, filtering, and conversion of size data submitted to the Secretariat (Data processing)
  • Keywords: Indo-Pacific king mackerel, length, selectivity, size, tuna fisheries
  • Type: Tabular file
  • Format: Microsoft XLSX
  • Size: 61 KB for original dataset and 35 KB for zipped file
  • Structure: 46 rows x 166 columns
  • Taxonomic referential: ASFIS
  • Geographic description: Fishing areas within the IOTC area of competence
  • Spatial extent: 75° to 100° longitude and 5° to 10° latitude for regular grids
  • Temporal extent: 1988-2024
  • Temporal extent start date: 1988-01-01
  • Temporal extent end date: 2024-12-31
  • Associated rights: Public-domain data requiring source acknowledgement
  • Spatial resolution: GRID5x5 (see Spatial resolution)
  • Geographic referential: CWP grids with approximation for some fishing areas (see spreadsheet IRREGULAR GRIDS)
  • Temporal resolution: Less than one year (see Temporal resolution)
  • Temporal referential: ISO8601
  • Update frequency: Once per year
  • Metadata production date: 03 February 2026
  • Source: IOTC
  • Contact: IOTC-Statistics@fao.org
  • Credit: IOTC Secretariat

 

 

Size measurement features

  
SpeciesIndo-Pacific king mackerel
Species codeGUT
Standard sizeFork length
Standard size codeFL
Unitcm
Maximum standard size76
First standard size class10
Size class interval1
Maximum size class interval3
 

Fields

FIELDDEFINITIONCODE LIST
FleetIOTC fishing fleet codeFLEET
YearYear of sampling 
MonthStartFirst month of sampling 
MonthEndLast month of sampling 
GridStandard CWP area codeCWP GRIDS
GearIOTC fishing gear codeGEAR
SpeciesASFIS three-alpha code of the species 
School TypeType of association of the fish schoolSCHOOL TYPE
MeasureTypeType of measurementMEASURE TYPE
FirstClassLowFirst length class (corresponding to class C001) 
 

Contents

 

Spatial resolution

Grid typeResolutionStrataSamples
5GRID1x1301,943
6GRID5x5512,269
 

Temporal resolution

Time period (mo)StrataSamples
1814,212
 

Code lists

 

Fishing fleet

FLEET_CODEFLEET
LKASri Lanka
MYSMalaysia
THAThailand
 

Fishing gear

GEAR_CODEGEAR
GILLGillnet
PSSSmall purse seine
 

School type

CATCH_SCHOOL_TYPE_CODECATCH_SCHOOL_TYPE
UNCLUnknown
 

Measure type

MEASURE_TYPE_CODEMEASURE_TYPE
FLTip of snout-fork of the tail length
EFLEye to fork length (caudal margin of eye to the fork of the tail)

 

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