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Indicator 14.6.1: Progress by countries in the degree of implementation of international instruments aiming to combat illegal, unreported and unregulated fishing

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    Book (series)
    Implementation of the International Plan of Action to Prevent, Deter and Eliminate Illegal, Unreported and Unregulated Fishing
    1. Methodologies and indicators for the estimation of the magnitude and impact of illegal, unreported and unregulated fishing: 1.2 A practical guide to delivering an estimate
    2023
    Also available in:
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    Applying the principles and approaches from Volume 1 of this series, this practical guide details the steps necessary to plan, execute and present estimates of illegal, unreported and unregulated fishing. For the initial planning phase, the guide provides information on how to work with stakeholders to define objectives, examine and catalogue available data, and then match the objectives with the available data to determine the most useful estimation methods. Also discussed are subsequent steps involving designing a conceptual model, triangulating alternative approaches, dealing with data gaps and biases, and accounting for uncertainty. For the execution phase, guidance is provided for developing and running models, including checking preliminary outputs with stakeholders and experts, before refining and finalizing results. Guidance for the final presentation phase focuses on how to ensure the methodology, data inputs and gaps, and assumptions are clearly explained. As in the first two phases, allowing for feedback from stakeholders on the study results, and refining the outputs as necessary, will strengthen both the quality of the work and its uptake by decision-makers.
  • Thumbnail Image
    Book (series)
    Implementation of the International Plan of Action to Prevent, Deter and Eliminate Illegal, Unreported and Unregulated Fishing
    1. Methodologies and indicators for the estimation of the magnitude and impact of illegal, unreported and unregulated fishing: 1.3 A catalogue of examples
    2023
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    This document complements previous technical guidance documents on planning and executing illegal, unreported and unregulated (IUU) fishing estimation studies by providing a catalogue of 26 estimation methodologies from published studies. These methodologies encompass a wide range of locations, fishing gear and IUU fishing types. The catalogue is organized around two ways of identifying relevant methodologies: a) the IUU fishing estimation approach; and b) the primary available data source. The five types of IUU fishing estimation approaches (“a”) include: 1) estimating total catch minus reported catch; 2) partitioning total catch into IUU/non-IUU fishing; 3) summing individual IUU fishing events to a total amount; 4) estimating “true” catches for suspect vessels or fleets; and 5) determining relative amounts or trends in IUU fishing. The four types of primary data sources (“b”) include: 1) fishery models; 2) commercial sources; 3) operational data; and 4) expert judgements, comparisons to catch compilations and stakeholder surveys. These two types of approaches help to identify the relevant methodologies presented as concise, individual one- to two-page summaries. Each methodology is described in terms of the key elements needed and how they can be sourced, the specific steps involved in constructing the estimate, and guidance on the applicability of the method.

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