Overview

A collection of code lists modelling:

  • characterizing elements of core statistical datasets (type of data, data raising, and estimation)
  • all types of data sources (dataset-specific)
  • all types of data processing (dataset-specific)
  • original data coverage

Return back to the list of reference data domains.

Data Origin and Processing

Paragraph 3.(a) of IOTC Res. 15/02 state the following concerning catch-and-effort data: “(…) The data shall be extrapolated to the total national monthly catches for each gear. Documents describing the extrapolation procedures (including raising factors corresponding to the logbook coverage) shall also be submitted routinely”.

In addition, the following is stated in Paragraph 4 (Size Data): “(…) Size sampling shall be run under strict and well described random sampling schemes which are necessary to provide unbiased figures of the sizes taken.” and “(…) 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 (…)”.

Types of Datasets

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Reference codes modelling the different type of fishery statistics datasets reported to the IOTC Secretariat (see also: the datasets available to IOTC).

Types of Data

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Reference codes modelling the type of statistics provided through a specific form, and in particular if these are:

  1. preliminary if the statistics were estimated by using some information from the fishery and year concerned, and the data reported are likely to change in the future as more information become available; or
  2. final if the statistics were estimated by using the complete set of data from the fishery and year concerned, and the data reported are unlikely to change in the future.

Referenced in forms: 1RC, 1RC, 1DI, 1IN, 2FC, 3CE, 3CE (update), 3DA, 3DA (update), 3AA, 3AA (update), 3BU, 4SF, 4SF (update)

Raisings

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Reference codes modelling the level of raising applied to the data, and in particular if data:

  1. have been raised to the represent the total catches and effort in the year concerned (RT),
  2. have been raised but does not represent the total catches and effort in the year concerned (PR), or
  3. have not been raised at all (NR)

Referenced in forms: 1DI, 2FC, 3CE, 3CE (update), 3DA, 3DA (update), 3AA, 3AA (update), 4SF, 4SF (update)

Estimations

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Reference codes indicating if the data estimated for a stratum was actually recorded in the stratum or derived from comparable strata through a substitution scheme.

Referenced in forms: 3CE, 3CE (update), 3DA, 3DA (update), 3AA, 3AA (update), 4SF, 4SF (update)

Sources

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The types of datasets that were used to estimate the statistics that are reported to the IOTC and main sources for those datasets.

Sources of Catch and Effort Data

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Reference codes modelling the source of the data provided through the catch-and-effort data forms.

Referenced in forms: 3CE, 3CE (update)

Sources of Discard Data

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Reference codes modelling the source of the data provided through the discards data form.

Referenced in forms: 1DI

Sources of Data on Fish Aggregating Devices

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Reference codes modelling the source of the data provided through the FAD data form.

Referenced in forms: 3DA, 3DA (update), 3AA, 3AA (update)

Sources of Data on Fishing Crafts

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Reference codes modelling the source of the data provided through the fishing craft data form.

Referenced in forms: 2FC

Sources of Data on Retained Catches

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Reference codes modelling the source of the data provided through the retained catches data form.

Referenced in forms: 1RC, 1RC

Sources of Data on Size-Frequencies

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Reference codes modelling the source of the data provided through the size-frequency data form.

Referenced in forms: 4SF, 4SF (update)

Processings

Reference codes modelling the type of processing applied to raw information to obtain the data provided through a specific form.

Processings of Catch and Effort Data

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The most common methods used to estimate retained catches, discards, numbers of fishing crafts, catch-and-effort, and size data from the datasets collected for each fishery.

Referenced in forms: 3CE, 3CE (update)

Processings of Discard Data

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Reference codes modelling the processing applied to the data provided through the discard data form.

Referenced in forms: 1DI

Processings of Fish Aggregating Device Data

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Reference codes modelling the processing applied to the data provided through the FAD data form.

Referenced in forms: 3DA, 3DA (update), 3AA, 3AA (update)

Processings of Fishing Craft Data

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Reference codes modelling the processing applied to the data provided through the fishing craft data form.

Referenced in forms: 2FC

Processings of Retained Catch Data

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Reference codes modelling the processing applied to the data provided through the retained catch data form.

Referenced in forms: 1-RC

Processings of Size-Frequency Data

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Reference codes modelling the processing applied to the data provided through the size-frequency data form.

Referenced in forms: 4SF, 4SF (update)

Data Coverage

‘Coverage’ refers to the proportion that the amount of fish (in number or weight) or fishing effort that is monitored (sampled) makes out of the total estimated in the stratum concerned.

Types of Coverage

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The type of metrics used to determine the coverage of each stratum for a given dataset.

Actual coverage values, i.e., the proportion that the total number of fish sampled (or sampled weight) for the species make out of the total number (or weight) of fish caught for that species and fishery concerned, shall be provided as a separate field attached to each stratum.

Referenced in forms: 1RC, 1RC, 1DI, 1IN, 2FC, 3CE, 3CE (update), 3DA, 3DA (update), 3AA, 3AA (update), 4SF, 4SF (update)