Size frequency data

Data reporting
Compliance workshop:
Collection and reporting of Fisheries data to IOTC
Mauritius, March 2014
IOTC Resolutions
Data REPORTING standards
Data COLLECTION standards
 10/02 Resolution Mandatory
statistical requirements for IOTC
Members and Cooperating NonContracting Parties (CPC’s).
 13/03 On the recording of catch
and effort data by fishing vessels
in the IOTC Area of Competence
 11/04 Regional Observer Scheme
Statistical Requirements
Coastal fleets
EEZ vessels less than 24 m LOA
Annual catches (NC+DI)
Active Crafts (FC)
Number of fishig craft per boat-gear type category per year
Catch-and-Effort (CE)
CE Data by fishery (type of boat-gear), area and period
Size data (SF)
Scientific observer data
Socio-economic data
Foreign fleets EEZ catch
Industrial surface and longline fleets
Vessels with LOA ≥ 24 m and all high seas vessels
Nominal catches plus discards of IOTC Species, main species of pelagic sharks, and other bycatch, per IOTC Area and Year
Individual vessel data for all fishing ships catching IOTC species
Surface fisheries: CE by fishery, 1 degree square grid and month
Longline fisheries: CE by fishery, 5 degree square grid and month
Individual lengths of IOTC species sampled, by fishery, species, 5 degrees square grid, and month
Sample of catches in land to cover at least 5% vessel activities
Sample of catches at-sea to cover at least 5% fishing operations
No standards have been set as yet
Not applicable
CE data for foreign licensed fishing vessels (above CE standards)
IOTC Resolutions – Recap
IOTC Resolution 10/02 Mandatory statistical requirements for IOTC Members
and Cooperating Non-Contracting Parties (CPC’s).
Includes requirements on the data collection and reporting standards of:
(a.) Nominal catch data, including
- Retained catches (IOTC Form 1RC)
- Discards (IOTC Form 1DI)
(b.) Catch-and-effort data (IOTC Form 3CE1), including:
- Surface fisheries
- Longline fisheries
- Coastal fisheries
(c.) Size frequency data (IOTC Form 4SF)
Nominal catch
IOTC Resolution 10/02: Estimates of the total annual catch by species and gear for
all species under the IOTC mandate.
• Records estimates of total annual catches plus discards, by species, fishery (gear)
and area.
• Highly aggregated catches by gear (fishery) and geographic area (East/West IO).
• Data should be reported for all species under the IOTC mandate, in addition to
pelagic sharks and by-catch.
Data collection methods
• Nominal catches are usually derived from a combination of:
1. Catch reports, logbooks, regional observers, or landing statistics from port
authorities for the industrial fleet;
2. Sample-based estimation of small-scale traditional or artisanal fleets.
• In theory, data reporting should include total enumeration of catches (or raised
sampled catches) – but highly dependent on the availability and quality of data,
particularly for the artisanal fisheries.
Nominal catch (IOTC form 1RC)
Nominal catch (IOTC form 1RC)
Reporting standards:
- One data entry line required for catches for each fishery (gear) and area
Form 1RC – Main data fields to capture
• FISHERY – gear type
• AREA – East or West Indian Ocean
• TYPE OF DATA – Final or preliminary
• DATA SOURCES – e.g., unloaded catches reported by customs
• DATA PROCESSING – details of whether the nominal catches are sample-based,
have been raised, or refer to total enumeration of catches
• TARGET SPECIES – main species targeted by fishery (gear type)
• COVERAGE – proportion of catch sampled, or total enumeration
IOTC Resolution 10/02: Catch-and-effort data
Data requirements
a) For surface fisheries:
• Catch weight by species and fishing effort shall be provided by 1° grid area and
month strata.
• Purse seine fishery data shall be stratified by fishing mode (e.g. free swimming
schools or schools in association with floating objects).
b) Longline fisheries:
• Catch by species, in numbers or weight, and effort expressed as the number of
hooks deployed shall be provided by 5° grid area and month strata.
c) For coastal fisheries:
• Available catch by species, fishing gear and fishing effort shall be submitted
frequently and may be provided using an alternative geographical area if it better
represents the fishery concerned.
 Documents describing the extrapolation procedures (including raising factors
corresponding to the logbook coverage) shall also be submitted routinely.
Catch and effort
Data collection methods
Data is collected for vessels from information provided in log-books submitted to
port authorities, or from sampling at landing sites which are then raised to the
total number of active vessels.
Data can be either be submitted to IOTC Secretariat extrapolated to the total
monthly catches for each gear, or as un-raised data (provided that information on
raising factors are submitted on a routine basis).
Main data fields to report:
For each vessel sampled, and fishing activity:
1. vessel name/identification
2. month of fishing activity
3. location of fishing activity (e.g., 5° or 1° grid area)
4. Effort (and unit of effort)
5. Catch by species (in numbers and/or weight)
Catch and effort (form 3CE1)
Units of effort
A number of ways of measuring effort – but also different levels of precision:
No. of vessels;
No. of unloadings;
No. of fishing trips;
No. of days at sea (includes searching, breakdown, time
travelling to and from fishing area);
No. of fishing days – no. days on which fishing took place;
No. of sets;
Quantity of gear used (gear specific units), e.g.,
• Longline: No. of hooks set per day
• Handline: No. of lines used per day
• Pole-and-line: No. of poles used per day
• Gillnet: number and size of panels used in each set
• Trawling: No. of lines, or hours trawled per day
Increase in
in effort
Size frequency data
IOTC Resolution 10/02: Size frequency data
Data requirements
Size frequency data shall be provided for all gears and for all species covered by
the IOTC mandate according to the guidelines set out by the IOTC Scientific
• Sampling coverage shall be set to at least one fish measured by ton caught, by
species and type of fishery, with samples being representative of all the
periods and areas fished.
• Alternatively, size data for longline fleets may be provided as part of the
Regional Observer Scheme where such fleets have at least 5% observer
coverage of all fishing operations.
• Length data by species, including the total number of fish measured, shall be
submitted by a 5° grid area by month, by gear and fishing mode (e.g. free
swimming schools or associated schools).
Size frequency data
Data collection
• Length and weight data may be collected for all fish caught (total enumeration),
but are usually taken for a sample of the total catch.
• Data usually collected by enumerators at landing sites using a random sample
during the unloading of the fish, based on either a fixed number (e.g., the first 20
fish unloaded) or as proportion of the total catch unloaded.
• Samples can also be taken onboard by observers or crew members.
• Length and weight data may also be recorded and reported to IOTC Secretariat for
all sampled fish sampled or sample sub-set.
Size frequency data (IOTC form 4SF)
Size frequency data (IOTC Form 4SF)
One form submitted to IOTC Secretariat for each species and fishery (gear).
Records the individual body lengths (and weight) of sampled fish, aggregated by 5°
square grid area and month.
Data can be submitted as unraised data, or raised (e.g., by time-area to catches in
each 5° grid reported by the catch-and-effort).
Main data fields to report:
For each vessel sampled:
1. vessel name/identification
2. month of fishing activity
3. location of fishing activity (Area and 5 Grid)
4. species identification
5. lengths, measurement unit (e.g., cm), measurement type (fork-length) of fish
sampled from the total catch
6. weights (for all fish sampled for length, or for a partial sub-set of samples)
Discussion points
Data Collection Resolutions
In order to meet the reporting requirements of Resolution 10/02, details of the
data collection and minimum coverage are set out in:
• Resolution 13/03 On the recording of catch and effort data by fishing vessels in
the IOTC Area of Competence
Resolution 14/01 Regional Observer Programme
Data collection: log-books
Resolution 13/03 On the recording of catch and effort data by fishing vessels in the
IOTC Area of Competence
• All vessels shall keep a bound paper or electronic logbook to record data that
includes, as a minimum requirement, the information and data in the logbook
set forth in Annex I, II and III.
Data collection
• Logbooks record the date, location and details of fishing activities of all vessel
• Information is collected through a mixture of interviews with skippers, and fishing
trips entered in vessel-log books submitted to port authorities.
• Total enumeration is required for all vessels operating in a fishery. One form is
completed per vessel, recording all fishing activity for a given reference period
(e.g., monthly).
Data collection: log-books
Record once per trip
• Vessel details: (e.g., vessel name, identification, flag, vessel type/size, gears used)
• Gear configuration: (e.g., purse seine: length of net, longline: average branch and
float line, gillnet: mesh size of net)
Record once per set/shot/operation
• Date of set
• Start (and end) position (longitude/latitude)
• Time of gear setting, or start fishing time
• Effort: (varies according to gear – e.g., longline: no. of hooks used in set, gillnet:
total length of net set, pole-and-line: number of poles used during the day).
• Catch (units vary according to gear): round weight (kg) and/or number by species
per set/shot/fishing event for each species
Log-book examples
11/04 Regional observer scheme
Data requirements
Sampling coverage: at least 5 % of the number of operations/sets for each gear
type by the fleet of each CPC while fishing in the IOTC area of competence of 24
meters overall length and over, and under 24 meters if they fish outside their
Exclusive Economic Zone (EEZ) shall be covered by this observer scheme.
11/04 Regional observer scheme
Data requirements
Observers shall:
a) Record and report fishing activities, verify positions of the vessel;
b) Observe and estimate catches as far as possible with a view to identifying catch
composition and monitoring discards, by-catches and size frequency;
c) Record the gear type, mesh size and attachments employed by the master;
d) Collect information to enable the cross-checking of entries made to the logbooks
(species composition and quantities, live and processed weight and location, where
available); and
e) Carry out such scientific work (for example, collecting samples), as requested by the
IOTC Scientific Committee.

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