Aldo Tomo

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Director de Programas Nacionales e internacionales sobre Biología Antártica. Miembro del Comité Ejecutivo del Programa BIOMASS y Miembro del Comité Científico de la CAMLAR, desde 1971 a 1991, e el Presente estoy retirado y leo los avances en la Biología, Ecología, Oceanografía y explotación y Conservación de los Recursos Marinos Antártico y los ecosistemas vecinos

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Pia Schuchert

Esteban Barrera-oro

Mark Belchier

Mario George-nascimento

Magnus George

M.Teresa González

T. Mariella Canales

Pontificia Universidad Catolica de Chile

Enrique Alberto Crespo

Carlos A Moreno

Universidad Austral de Chile

María V Quiroga

Universidad Nacional de San Martín

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New information on age and growth in length of Micromesistius australis, Norman 1937 (Pisces, Gadidae), in the South-West Atlantic

Polar Biology, 1988

Sagittal otoliths were used for age determination in 1121 specimens of Micromesistius australis, ... more Sagittal otoliths were used for age determination in 1121 specimens of Micromesistius australis, caught in waters of the SouthWest Atlantic during the cruises made by the ships Walther Herwig and Shinkai Maru in agreement with the Argentine Republic, during the years 1978 and 1978/1979, respectively. The interpretation of growth rings required the otoliths to undergo a paraffin wax embedding and cutting technique. The relations otolith length-fish length and fish length-half otolith width were linear. Thus, back calculations, when necessary, were made by a simple extrapolation. Numbers of males and females were nearly equal, resulting in a sex ratio of 1:1.09. Length frequencies and age distributions were calculated for each sex separately. A significant difference in growth between sexes was found, curves for each were derived. A linear regression was made and the Von Bertalanffy equation estimated as: Lt = 56.90 [1-e-0"1983 (t+1.84)] in males, and Lt = 60.08 [1-e-0"1769 (t+2.07)] in females, with Lt in cm and t in years. For estimation of these equation parameters age groups 2-16 years in males and 2-22 years in females were taken into account. All theoretical Lt values and almost all observed lengths for females were greater than those of males in corresponding age groups. Previously published observations about M. australis on this subject, are not in agreement or only in partial accord with present results. These are discussed. Original photographs of otolith cross sections illustrating age determination methods are presented for the first time in age and growth studies of this species.

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Feeding and ecology of Notothenia larseni, Lönnberg

by Aldo Tomo and Esteban Barrera-oro

New information on age and growth in length of Micromesistius australis, Norman 1937 (Pisces, Gadidae), in the South-West Atlantic

by Aldo Tomo and Esteban Barrera-oro

Polar Biology, 1988

Sagittal otoliths were used for age determination in 1121 specimens of Micromesistius australis, ... more Sagittal otoliths were used for age determination in 1121 specimens of Micromesistius australis, caught in waters of the South-West Atlantic during the cruises made by the ships Walther Herwig and Shinkai Maru in agreement with the Argentine Republic, during the years 1978 and 1978/1979, respectively. The interpretation of growth rings required the otoliths to undergo a paraffin wax embedding and cutting technique. The relations otolith length-fish length and fish length-half otolith width were linear. Thus, back calculations, when necessary, were made by a simple extrapolation. Numbers of males and females were nearly equal, resulting in a sex ratio of 1:1.09. Length frequencies and age distributions were calculated for each sex separately. A significant difference in growth between sexes was found, curves for each were derived. A linear regression was made and the Von Bertalanffy equation estimated as: Lt = 56.90 [1-e -0"1983 (t+1.84)] in males, and Lt = 60.08 [1 -e -0"1769 (t+2.07)] in females, with Lt in cm and t in years. For estimation of these equation parameters age groups 2-16 years in males and 2-22 years in females were taken into account. All theoretical Lt values and almost all observed lengths for females were greater than those of males in corresponding age groups. Previously published observations about M. australis on this subject, are not in agreement or only in partial accord with present results. These are discussed. Original photographs of otolith cross sections illustrating age determination methods are presented for the first time in age and growth studies of this species.

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New information on age and growth in length of Micromesistius australis, Norman 1937 (Pisces, Gadidae), in the South-West Atlantic

Polar Biology, 1988

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Feeding and ecology of Notothenia larseni, Lönnberg

by Aldo Tomo and Esteban Barrera-oro

New information on age and growth in length of Micromesistius australis, Norman 1937 (Pisces, Gadidae), in the South-West Atlantic

by Aldo Tomo and Esteban Barrera-oro

Polar Biology, 1988

Sagittal otoliths were used for age determination in 1121 specimens of Micromesistius australis, ... more Sagittal otoliths were used for age determination in 1121 specimens of Micromesistius australis, caught in waters of the South-West Atlantic during the cruises made by the ships Walther Herwig and Shinkai Maru in agreement with the Argentine Republic, during the years 1978 and 1978/1979, respectively. The interpretation of growth rings required the otoliths to undergo a paraffin wax embedding and cutting technique. The relations otolith length-fish length and fish length-half otolith width were linear. Thus, back calculations, when necessary, were made by a simple extrapolation. Numbers of males and females were nearly equal, resulting in a sex ratio of 1:1.09. Length frequencies and age distributions were calculated for each sex separately. A significant difference in growth between sexes was found, curves for each were derived. A linear regression was made and the Von Bertalanffy equation estimated as: Lt = 56.90 [1-e -0"1983 (t+1.84)] in males, and Lt = 60.08 [1 -e -0"1769 (t+2.07)] in females, with Lt in cm and t in years. For estimation of these equation parameters age groups 2-16 years in males and 2-22 years in females were taken into account. All theoretical Lt values and almost all observed lengths for females were greater than those of males in corresponding age groups. Previously published observations about M. australis on this subject, are not in agreement or only in partial accord with present results. These are discussed. Original photographs of otolith cross sections illustrating age determination methods are presented for the first time in age and growth studies of this species.

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