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CCAMLR

Comisión para la Conservación de los Recursos Vivos Marinos Antárticos

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Abstract: 

In this study, otolith microstructure analysis on 7 blue phase fingerlings and 26 brown phase fingerlings selected from a total sample of 364 early juveniles caught mainly in summer from 2003 to 2010 at Potter Cove, South Shetland Islands, allowed to provide insights on early life history timings and to validate annulus formation. Although in the literature it has been reported that N. rossii in the South Shetland Islands hatches in spring, our daily ring back counting in otoliths from the date of capture showed two main periods of larval hatching separated by 5-6 months, one in late summer between February and March and another in winter between July and August. The maximum and minimum ages estimated for the pelagic blue phase and demersal brown phase fingerlings were respectively 227 and 240 days, indicating a timing of demersal settlement of about eight months from hatching. The age/length frequency distribution of fish sampled in spring 2010 showed the simultaneous presence of two different cohorts, belonging to biological ages 0+ and 1+ that hatched respectively in summer and winter. The growth rate of N. rossii fingerlings in Potter Cove was estimated between 0.26 and 0.31 mm/day, which is equivalent to that reported for fingerlings caught at South Georgia, and considerably higher than the growth rates known for other nototheniids within similar size range. Based on the early life events associated with the two hatching periods in N. rossii, two main types of life cycles are hypothesised for South Shetland Islands fingerlings. All the pelagic blue phase fingerlings (age group 0+) hatched in July-August (winter cohort), entering in Potter Cove in February-March. The brown phase fingerlings (age group 0+) hatched in February-March (summer cohort), entering in the cove already in spring, i.e. from September-October onwards. Finally, early juveniles (age group 1+) hatched in July-August, entering in the cove the following year to spend the second winter inshore.

Abstract: 

Following seals and baleen whales prior to the 1970s, demersal fish stocks were depleted off the South Shetland Islands by intensive industrial fishing during the late 1970s to early 1980s. Little has been reported since about how these stocks have fared, after international agreement closed this fishery in 1990. We report changes in size and abundance of the commercially exploited Notothenia rossii and Gobionotothen gibberifrons relative to the ecologically similar but unexploited N. coriiceps at Potter Cove, South Shetland Islands, over a 28-yr period, 1983-2010. N. rossii abundance declined from 1983 to 1991, and an increase in mean size during 1983-84 is consistent with weak cohorts during preceding years. Modal age changed from 2-3 to 6-7 yr. Length data of G. gibberifrons, available from 1986, exhibited a similar pattern, showing a decrease until 1991-92. After a period of relative stability (1992-1994), a sharp increase in length and a continued decline in relative abundance indicated low recruitment. The length-frequency distribution of unexploited N. coriiceps throughout the whole period showed no change in modal size or mean length of the fish. We relate these patterns to the fishery and suggest that a further two decades will lapse before these stocks recover. Using the South Shetland fisheries as an example, current management rules for Southern Ocean fisheries, deemed to be precautionary and disallowing depletion beyond which a stock can recover in 2-3 decades, may be unrealistic in an ocean profoundly altered by numerous stock depletions and rapid climate change.

ASOC

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Observer

Fine-scale catch, effort and biological data (C4 trawl surveys)

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SCAF-12

Nombre: 
Comité Permanente de Administración y Finanzas
  • Meeting documents
Doc Number Título
CCAMLR-XXXI/03 Examen de los estados financieros auditados de 2011
Secretario Ejecutivo
CCAMLR-XXXI/04 Examen del presupuesto de 2012, proyecto de presupuesto de 2013 y proyección del presupuesto para 2014
Secretario Ejecutivo
CCAMLR-XXXI/06 Informe del Secretario Ejecutivo a SCAF, 2012
Secretario Ejecutivo
CCAMLR-XXXI/07 Estrategia de Sueldos y de Dotación de Personal de la CCRVMA Informe de aplicación: 2012
Secretaría
CCAMLR-XXXI/08 Estatutos del Personal
Secretaría
CCAMLR-XXXI/28 Informe del grupo de trabajo por correspondencia de SCAF Revisión del reglamento financiero de la CCRVMA
Coordinador, SCAF-CG
CCAMLR-XXXI/BG/04 Description of the general fund budget
Secretariat
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SCIC-12

Nombre: 
Comité Permanente de Ejecución y Cumplimiento
  • Meeting documents
Doc Number Título
CCAMLR-XXXI/05 Condición de Singapur como Parte no-contratante (PNC) que coopera con el Sistema de Documentación de la Captura (SDC) de la CCRVMA
Secretaría
CCAMLR-XXXI/11 Notificaciones de pesquerías de kril en 2012/13
Secretaría
CCAMLR-XXXI/12 Rev. 1 Notificaciones de pesquerías nuevas y exploratorias en 2012/13
Secretaría
CCAMLR-XXXI/13 Rev. 1 Examen del Sistema de Seguimiento de Barcos (VMS) de la CCRVMA
Secretaría
CCAMLR-XXXI/17 Rev. 4 Implementación de las Medidas de Conservación 10-06 y 10-07 Actividades de pesca INDNR y listas de barcos de pesca INDNR de la CCRVMA 2011/12
Secretaría
CCAMLR-XXXI/29 Propuesta de un Procedimiento de Evaluación del Cumplimiento en la CCRVMA
Delegación de Australia
CCAMLR-XXXI/33 Propuesta de la UE para modificar la Medida de Conservación 21-03 de la CCRVMA con el fin de incorporar la evaluación de la incertidumbre y la variabilidad en la estimación del peso en vivo registrada en notificaciones de pesquerías de kril
Delegación de la Unión Europea
CCAMLR-XXXI/35 Información sobre la pesca ilegal en el Área estadística 58 Evaluación de la pesca ilegal en aguas francesas alrededor de las islas Kerguelén y Crozet Informe de las observaciones e inspecciones realizadas en el Área de la CCRVMA Temporada 2011/2012 (1 julio 2011 – 15 julio 2012)
Delegación de Francia
CCAMLR-XXXI/37 Taller de desarrollo de capacidades en relación con la pesca INDNR en África y gastos del Fondo del SDC – Informe a CCAMLR-XXXI
Delegaciones de Australia, Sudáfrica y Reino Unido, y Secretaría
CCAMLR-XXXI/38 Propuesta para mejorar y aclarar el Sistema de Documentación de la Captura de la CCRVMA
Delegación de Estados Unidos
CCAMLR-XXXI/39 Propuesta para reforzar el sistema de inspección en puerto de la CCRVMA para prevenir, desalentar y eliminar la pesca ilegal, no declarada y no reglamentada
Delegaciones de EEUU y la Unión Europea
WG-FSA-12/66 Rev. 2 Summary of scientific observations in the CAMLR Convention Area for 2011/12
Secretariat
WG-FSA-12/70 Rev. 2 Summary of scientific observations related to Conservation Measures 24-02 (2008), 25-02 (2009) and 26-01 (2009)
Secretariat
CCAMLR-XXXI/BG/06 Implementation of fishery conservation measures in 2011/12
Secretariat
CCAMLR-XXXI/BG/07 Submission in support of Singapore’s request for the reinstatement of its status as a non-Contracting Party (NCP) cooperating with CCAMLR by participating in the Catch Documentation Scheme (CDS)
Submitted by Singapore
CCAMLR-XXXI/BG/13 Establishing proper fishing vessel governance and control in the CCAMLR Area
Submitted by ASOC
CCAMLR-XXXI/BG/16 Old challenges, new leadership: CCAMLR and the fight against IUU fishing in the Southern Ocean and beyond
Submitted by ASOC
CCAMLR-XXXI/BG/20 Heard Island and McDonald Islands Exclusive Economic Zone 2011/12 IUU catch estimate for Patagonian toothfish
Delegation of Australia
CCAMLR-XXXI/BG/21 Rev. 2 Implementation of the System of Inspection and other compliance related measures in 2011/12
Secretariat
CCAMLR-XXXI/BG/22 Rev. 1 Implementation and operation of the Catch Documentation Scheme for Dissostichus spp. in 2011/12
Secretariat
CCAMLR-XXXI/BG/28 Rev. 1 Implementation of Conservation Measure 31-02
Delegation of New Zealand
CCAMLR-XXXI/BG/30 Implementation of Conservation Measure 31-02
Delegation of the United Kingdom
CCAMLR-XXXI/BG/32 Sistema de Seguimiento de Barcos (VMS) y su registro en el documento de captura (DCD)
Delegación de Chile
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Correo electrónico: ccamlr [at] ccamlr [dot] org
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