First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures

The southern king crab, Lithodes santolla Molina, and stone crab, Paralomis granulosa Jacquinot, inhabit the cold-temperate waters of southernmost South America (southern Chile and Argentina), where stocks of both species are endangered by overfishing. Recent investigations have shown that these cra...

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Autores principales: Calcagno, J.A., Lovrich, G.A., Thatje, S., Nettelmann, U., Anger, K.
Formato: JOUR
Materias:
Juvenile development
King crabs
Lithodes santolla
Lithodidae
Paralomis granulosa
Stone crabs
Temperature tolerance
crab
growth rate
overfishing
temperature effect
South America
Western Hemisphere
World
Chaceon affinis
Limulus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13851101_v54_n3_p221_Calcagno
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_13851101_v54_n3_p221_Calcagno2023-10-03T16:12:05Z First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures Calcagno, J.A. Lovrich, G.A. Thatje, S. Nettelmann, U. Anger, K. Juvenile development King crabs Lithodes santolla Lithodidae Paralomis granulosa Stone crabs Temperature tolerance crab growth rate overfishing temperature effect South America Western Hemisphere World Chaceon affinis Limulus Lithodes santolla Lithodidae Paralomis granulosa The southern king crab, Lithodes santolla Molina, and stone crab, Paralomis granulosa Jacquinot, inhabit the cold-temperate waters of southernmost South America (southern Chile and Argentina), where stocks of both species are endangered by overfishing. Recent investigations have shown that these crabs show life-cycle adaptations to scarcity of food and low temperatures prevailing in subantarctic regions, including complete lecithotrophy of all larval stages and prolonged periods of brooding and longevity. However, growth and development to maturity are slow under conditions of low temperatures, which may explain the particular vulnerability of subpolar lithodids to fisheries. In the present study, juvenile L. santolla and P. granulosa were individually reared in the laboratory at constant temperatures ranging from 3-15°C, and rates of survival and development through successive instars were monitored throughout a period of about nine months from hatching. When the experiments were terminated, L. santolla had maximally reached juvenile instar IV (at 6°C), V (9°C), or VII (15°C). In P. granulosa the maximum crab instar reached was II (at 3°C), V (6°C), V (9°C), or VII (15°C). The intermoult period decreased with increasing temperature, while it increased in successively later instars. In consequence, growth rate showed highly significant differences among temperatures (P<0.001). Growth-at-moult was highest at 9°C. Rates of survival decreased significantly in juvenile P. granulosa with increasing temperature. Only at 15°C in L. santolla, was a significantly enhanced mortality found compared with lower temperatures. Our results indicate that juvenile stages of L. santolla and P. granulosa are well adapted to 5-10°C, the range of temperatures typically prevailing in subantarctic marine environments. In spite of causing higher mortality rates, higher rearing temperatures (12-15°C) should accelerate the rates of growth and maturation, which may be favourable for projects aiming at aquaculture or repopulation of overexploited king crab stocks. © 2005 Elsevier B.V. All rights reserved. Fil:Calcagno, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lovrich, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13851101_v54_n3_p221_Calcagno
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Juvenile development
King crabs
Lithodes santolla
Lithodidae
Paralomis granulosa
Stone crabs
Temperature tolerance
crab
growth rate
overfishing
temperature effect
South America
Western Hemisphere
World
Chaceon affinis
Limulus
Lithodes santolla
Lithodidae
Paralomis granulosa
spellingShingle Juvenile development
King crabs
Lithodes santolla
Lithodidae
Paralomis granulosa
Stone crabs
Temperature tolerance
crab
growth rate
overfishing
temperature effect
South America
Western Hemisphere
World
Chaceon affinis
Limulus
Lithodes santolla
Lithodidae
Paralomis granulosa
Calcagno, J.A.
Lovrich, G.A.
Thatje, S.
Nettelmann, U.
Anger, K.
First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures
topic_facet Juvenile development
King crabs
Lithodes santolla
Lithodidae
Paralomis granulosa
Stone crabs
Temperature tolerance
crab
growth rate
overfishing
temperature effect
South America
Western Hemisphere
World
Chaceon affinis
Limulus
Lithodes santolla
Lithodidae
Paralomis granulosa
description The southern king crab, Lithodes santolla Molina, and stone crab, Paralomis granulosa Jacquinot, inhabit the cold-temperate waters of southernmost South America (southern Chile and Argentina), where stocks of both species are endangered by overfishing. Recent investigations have shown that these crabs show life-cycle adaptations to scarcity of food and low temperatures prevailing in subantarctic regions, including complete lecithotrophy of all larval stages and prolonged periods of brooding and longevity. However, growth and development to maturity are slow under conditions of low temperatures, which may explain the particular vulnerability of subpolar lithodids to fisheries. In the present study, juvenile L. santolla and P. granulosa were individually reared in the laboratory at constant temperatures ranging from 3-15°C, and rates of survival and development through successive instars were monitored throughout a period of about nine months from hatching. When the experiments were terminated, L. santolla had maximally reached juvenile instar IV (at 6°C), V (9°C), or VII (15°C). In P. granulosa the maximum crab instar reached was II (at 3°C), V (6°C), V (9°C), or VII (15°C). The intermoult period decreased with increasing temperature, while it increased in successively later instars. In consequence, growth rate showed highly significant differences among temperatures (P<0.001). Growth-at-moult was highest at 9°C. Rates of survival decreased significantly in juvenile P. granulosa with increasing temperature. Only at 15°C in L. santolla, was a significantly enhanced mortality found compared with lower temperatures. Our results indicate that juvenile stages of L. santolla and P. granulosa are well adapted to 5-10°C, the range of temperatures typically prevailing in subantarctic marine environments. In spite of causing higher mortality rates, higher rearing temperatures (12-15°C) should accelerate the rates of growth and maturation, which may be favourable for projects aiming at aquaculture or repopulation of overexploited king crab stocks. © 2005 Elsevier B.V. All rights reserved.
format JOUR
author Calcagno, J.A.
Lovrich, G.A.
Thatje, S.
Nettelmann, U.
Anger, K.
author_facet Calcagno, J.A.
Lovrich, G.A.
Thatje, S.
Nettelmann, U.
Anger, K.
author_sort Calcagno, J.A.
title First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures
title_short First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures
title_full First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures
title_fullStr First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures
title_full_unstemmed First year growth in the lithodids Lithodes santolla and Paralomis granulosa reared at different temperatures
title_sort first year growth in the lithodids lithodes santolla and paralomis granulosa reared at different temperatures
url http://hdl.handle.net/20.500.12110/paper_13851101_v54_n3_p221_Calcagno
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