CCAMLR

Las estimaciones de la biomasa prístina del kril (B₀) son esenciales para generar el límite de captura precautorio (LCP) para una ordenación de la pesquería de kril fundamentada científicamente. En 2019, se realizó una prospección acústica de múltiples Miembros a gran escala para aportar estimaciones de la biomasa del kril del Área 48, al tiempo que se realizaron también varias prospecciones a mesoescala en la Subárea 48.1. En el período entre sesiones de 2021, el grupo web del WG-ASAM aportó las estimaciones de la biomasa del kril de los cuatro estratos del US AMLR. Sin embargo, todavía no se han presentado las estimaciones de la biomasa del kril del resto de la Subárea 48.1 que el Comité Científico solicitó. Para facilitar el desarrollo del nuevo enfoque de ordenación, en este documento presentamos estimaciones de la biomasa de kril de la Subárea 48.1, basadas en los datos de las prospecciones acústicas disponibles hasta la fecha.

La Delegación de Noruega desea informar al Comité Científico de que se ha recopilado una base de conocimientos científicos que nos permitirá avanzar en la organización de un taller a principios de 2022 dedicado a estudiar y desarrollar junto con el resto de los Miembros de la CCRVMA y con los Observadores un conjunto de posibles AMP que conformen una propuesta para la etapa 2 del AMP del Mar de Weddell. Este documento de trabajo informa al Comité Científico sobre el estado actual de desarrollo de: i) la base de conocimientos científicos; ii) las capas de datos espaciales para la planificación espacial; iii) el procedimiento de consultas; iv) la cronología de la documentación; y v) las tareas previstas para mejorar la base de conocimientos científicos.

En este documento de trabajo, la delegación de Noruega invita a los Miembros y Observadores de la CCRVMA a participar de un taller en el primer semestre de 2022. El taller tendrá como objetivo: i) reunir los conocimientos expertos de los Miembros y Observadores de la CCRVMA para explorar soluciones para la planificación espacial del AMPMW-etapa 2 y ii) identificar en forma conjunta una variedad de posibles soluciones para la planificación espacial del AMPMW-etapa 2.

This paper presents the diagnostics associated with the 2021 48.4 Patagonian toothfish assessment.

This paper describes an updated CASAL based assessment of Patagonian toothfish (D. eleginoides) in Subarea 48.4. The assessment data are updated with the observations for the 2019 and 2020 seasons¹. Stock projections indicate that the stock was at 65% of B₀ in 2021 and that a yield of 23 tonnes in 2022 and 2023 is consistent with the application of the CCAMLR harvest control rule.

The assessment would lead to a recommendation from Working Group FSA to Scientific Committee that the catch limit for D. eleginoides in Subarea 48.4 should be set at 23 tonnes for 2021/22 and 2022/23.

¹  Seasons are referred to by the year that the CCAMLR season ends in, as this is when the fishing occurs, e.g. the 2020 season runs from 1^st December 2019 to 30^th November 2020.

This paper presents the diagnostics associated with the 2021 48.3 Patagonian toothfish assessment.

Assessment of the Patagonian toothfish (D. eleginoides) in Subarea 48.3 indicates that the current status of the stock is at 47% of B₀. Projections indicate that a constant catch of 2,072 tonnes in the 2022¹  and 2023 seasons would be consistent with the CCAMLR decision rule after accounting for recent mammal depredation rates.

The assessment would lead to a recommendation from Working Group FSA to Scientific Committee that the catch limit for D. eleginoides in Subarea 48.3 should be set at 2 072 tonnes for 2021/22 and 2022/23.

¹  The seasons are labelled according to calendar year in which the season finishes e.g. the 2020 season refers to the season from 1^st December 2019 to 30^th November 2020.

A summary of the intersessional work and discussion by the Risk Assessment e-group.

We provide an update on the implementation of the risk assessment in Subarea 48.1 resulting from discussions held during WG-EMM 2021. We have used track changes when adding textual changes incorporated since WG-EMM and all figures have been updated. In this version, we use an updated layer for winter krill density, evaluate some new scenarios and also include some sensitivity analyses.

We have applied the risk assessment framework, developed by Constable et al. (2016), to Subarea 48.1, with the aim of identifying the most appropriate management units by which to spatially distribute the local catch limit for the commercial fishery for Antarctic krill. We use the best available data for implementing the approach which was endorsed by the Commission in 2019. The framework is flexible and can accommodate new data to improve estimates of risk in the future.

We evaluated 36 catch distribution scenarios for assessing risks from krill fishing in Subarea 48.1. For each scenario we calculated the regional baseline risk, and the regional desirability risk. Baseline risk is defined as the risk to predators and krill and is based on predation pressure and the proportion of juvenile krill in each management unit. Desirability risk is defined as the risk to predators and krill as for the baseline risk, but also accounting for the desirability of a management area to the fishery i.e. more catch may be attributed to areas where the fishery has previously fished (desirable areas) than in the baseline scenario. We show that the spatial distribution with which the fishery currently operates presents some of the highest risks of all scenarios evaluated. Managing the fishery at much smaller scales has the lowest risk but may necessitate a high level of management interaction with the fishery.

This implementation can provide advice to CCAMLR for short-term management and could provide a template for the rest of Area 48. We highlight that each data layer impacts the outcome of the risk assessment and recommend that updated estimates of the distribution, abundance and consumption of krill, and estimates of available krill biomass will be key as CCAMLR moves forward to develop a longer-term management strategy.

A benefit of the risk assessment framework is that CCAMLR now has a tool for direct comparison of risks associated with alternative catch distributions at an appropriate spatial scale for management. We suggest one approach for choosing between scenarios, based on regional risk (either baseline or desirability).

We provide advice about the scale at which the krill fishery can be managed, but highlight important issues that should be discussed, including uncertainty, before CCAMLR agrees the design of spatial management units. We highlight that for the Risk Assessment to give a robust estimate of risk then it is important that the management units are at a similar scale as fishery operations. If management units are large, and the fishery operates in just a small portion of a particular unit, then the measure of risk estimated by the Risk Assessment will not reflect the risk posed by the fishery in that management unit.

Finally, we highlight that our endeavours have been the result of a community effort and we are grateful to those that have provided data and advice.

Es indispensable definir claramente toda unidad de ordenación espacial de las pesquerías de la CCRVMA. A fin de facilitar el desarrollo de un nuevo enfoque de ordenación del kril en la Subárea 48.1, se presentan los límites de las cinco unidades de ordenación propuestas, incluidos los cuatro estratos del Programa de los EE. UU. sobre los Recursos Vivos Marinos Antárticos (US AMLR), que han sido modificados con el propósito de facilitar la ordenación, y un estrato adicional adyacente a los US AMLR, incorporado como medida proactiva ante la necesidad de ordenar la pesquería de kril en el área del estrecho de Gerlache. Se exponen, también, los fundamentos de la modificación de los estratos US AMLR y la delimitación del nuevo estrato. Asimismo, se incluye el área de la superficie marina de los 5 estratos para facilitar su consulta.