Abid, Noureddine

Andrushchenko, Irene

Mejuto-García, J. (Jaime)

Neves-Santos, Miguel

Ortiz, Mauricio

Walter, John

Yokawa, Kotaro

Surplus Production Models of North Atlantic swordfish have been used in addition to age
structured virtual population analyses by ICCAT's SCRS to evaluate the status of the resource
and to provide a basis for management advice. Production models require a standardized index
of relative abundance in terms of biomass. The standardized biomass index of abundance
developed for the 2006, 2008 and 2012 ICCAT SCRS meetings for North Atlantic swordfish was
revised and updated with data through 2015. Generalized Linear Modeling (GLM) procedures
were used to standardize swordfish catch (biomass) and effort (number of hooks) data from the
major longline fleets operating in the North Atlantic; United States, EU-Spain, Canada, Japan,
Morocco and EU-Portugal. As in past analyses, main effects included: year, area, quarter, a
nation-operation variable accounting for gear and operational differences thought to influence
swordfish catchability, and a target variable to account for trips where fishing operations
varied according to the main target species. Interactions among main factors were also
evaluated.

Ortiz-de-Urbina-Gutiérrez, J.M. (José María)

Andrushchenko, I. (Irene)

Walter, J.

Neves-dos-Santos, M.

Abid, N.

Repositorio Institucional Digital del IEO

An Updated Combined Biomass index of abundance for North Atlantic Swordfish Stock 1963-2012

Surplus Production Models of North Atlantic swordfish have been used in addition to age structured virtual population analyses by ICCAT's SCRS to evaluate the status of the resource and to provide a basis for management advice. Production models require a standardized index of relative abundance in terms of biomass. The standardized biomass index of abundance developed for the 2006 and 2008 ICCAT-SCRS meetings for North Atlantic swordfish was revised and updated with data through 2012. Generalized Linear Modeling (GLM) procedures were used to standardize swordfish catch (biomass) and effort (number of hooks) data from the major longline fleets operating in the North Atlantic; United States, Spain, Canada, Japan, Morocco and Portugal. As in past analyses, main effects included: year, area, quarter, a nation-operation variable accounting for gear and operational differences thought to influence swordfish catchability, and a target variable to account for trips where fishing operations varied according to the main target species. Interactions among main factors were also evaluated

Yokawa, K. (Kotaro)

English

An updated combined biomass index of abundance for north Atlantic swordfish stock 1963-2012

Mejuto-García, Jaime

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/2354/1/Ortiz%20et%20al.%202014_2013_139.pdf

An Updated Combined Biomass index of abundance for North Atlantic Swordfish Stock 1963-2012

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Repositorio Institucional Digital del IEO

Repositorio Institucional Digital del IEO

Digital.CSIC