TY - GEN

T1 - Improving the assessment and management of the plaice stock complex between the North Sea and the Baltic Sea

A1 - Ulrich,Clara

A1 - Boje,Jesper

A1 - Cardinale,Massimiliano

A1 - Gatti,Paul

A1 - le Bras,Quentin

A1 - Andersen,Michael

A1 - Hansen,Jakob Hemmer

A1 - Hintzen,Niels T.

A1 - Jacobsen,Jonathan B.

A1 - Jonsson,Patrik

A1 - Miller,David C.M.

A1 - Eg Nielsen,Einar

A1 - Rijnsdorp,Adriaan

A1 - Svedäng,Henrik

A1 - Wennhage,Håkan

AU - Ulrich,Clara

AU - Boje,Jesper

AU - Cardinale,Massimiliano

AU - Gatti,Paul

AU - le Bras,Quentin

AU - Andersen,Michael

AU - Hansen,Jakob Hemmer

AU - Hintzen,Niels T.

AU - Jacobsen,Jonathan B.

AU - Jonsson,Patrik

AU - Miller,David C.M.

AU - Eg Nielsen,Einar

AU - Rijnsdorp,Adriaan

AU - Svedäng,Henrik

AU - Wennhage,Håkan

PB - International Council for the Exploration of the Sea (ICES)

CY - Copenhagen

PY - 2012

Y1 - 2012

N2 - Plaice in Kattegat and Skagerrak have traditionally been considered as one stock unit. However the collected information on biology and fishery in areas between the North and Baltic Seas suggest changes are needed in assessment units as well as in management areas. Plaice in Skagerrak (Division 20) is now considered to be closely associated with plaice in the North Sea and is proposed to be included in the North Sea plaice stock assessment, although it is recognized that <br/>local populations are present in the area. Therefore, specific management of the Skagerrak plaice is suggested. Plaice in Kattegat (Division 21), the Belts (Division 22), and the Sound (Division 23) is considered a stock unit and is proposed to be assessed as such. However, separate management by area is also suggested to assure the preservation of the local populations. Plaice in the Baltic <br/>(Divisions 24–32) is considered a stock unit and is proposed to be assessed and managed as such. Pragmatic options are suggested for empirical harvest control rules accounting for the dynamic of local abundance, using a survey‐based biomass indicator. For the future, new scientific analyses should be developed to better inform the origin of the catches, provided that additional resources <br/>are allocated to the annual monitoring of different stocks and components. Such information would provide on‐going quantitative information on the degree of mixing of the various components, potentially allowing a more accurate assessment, management, and conservation of the status of these

AB - Plaice in Kattegat and Skagerrak have traditionally been considered as one stock unit. However the collected information on biology and fishery in areas between the North and Baltic Seas suggest changes are needed in assessment units as well as in management areas. Plaice in Skagerrak (Division 20) is now considered to be closely associated with plaice in the North Sea and is proposed to be included in the North Sea plaice stock assessment, although it is recognized that <br/>local populations are present in the area. Therefore, specific management of the Skagerrak plaice is suggested. Plaice in Kattegat (Division 21), the Belts (Division 22), and the Sound (Division 23) is considered a stock unit and is proposed to be assessed as such. However, separate management by area is also suggested to assure the preservation of the local populations. Plaice in the Baltic <br/>(Divisions 24–32) is considered a stock unit and is proposed to be assessed and managed as such. Pragmatic options are suggested for empirical harvest control rules accounting for the dynamic of local abundance, using a survey‐based biomass indicator. For the future, new scientific analyses should be developed to better inform the origin of the catches, provided that additional resources <br/>are allocated to the annual monitoring of different stocks and components. Such information would provide on‐going quantitative information on the degree of mixing of the various components, potentially allowing a more accurate assessment, management, and conservation of the status of these

UR - http://ices.dk/products/CMdocs/CM-2012/N/N0212.pdf

BT - ICES CM 2012/N:02

T2 - ICES CM 2012/N:02

ER -