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Winter spawning of Antarctic toothfish Dissostichus mawsoni in the Ross Sea region

Published online by Cambridge University Press:  01 August 2019

Steven J. Parker Open the ORCID record for Steven J. Parker [Opens in a new window] ,
Darren W. Stevens ,
Laura Ghigliotti ,
Mario La Mesa Open the ORCID record for Mario La Mesa [Opens in a new window] ,
Davide Di Blasi  and
Marino Vacchi
Steven J. Parker*
Affiliation:
National Institute of Water and Atmospheric Research, PO Box 893, Nelson, New Zealand
Darren W. Stevens
Affiliation:
National Institute of Water and Atmospheric Research, Private Bag 14901, Wellington, New Zealand
Laura Ghigliotti
Affiliation:
IAS, National Research Council of Italy, via de Marini 6, Genoa, 16149, Italy
Mario La Mesa
Affiliation:
Institute of Polar Sciences, c/o Area di Ricerca di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
Davide Di Blasi
Affiliation:
IAS, National Research Council of Italy, via de Marini 6, Genoa, 16149, Italy
Marino Vacchi
Affiliation:
IAS, National Research Council of Italy, via de Marini 6, Genoa, 16149, Italy
*
[email protected]
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Abstract

A survey of Antarctic toothfish (Dissostichus mawsoni) was conducted in the northern Ross Sea region during the winter of 2016 to document the timing and location of spawning activity, to collect biological information about reproductive status during the spawning season and to look for temporal signals in biological data from D. mawsoni that may indicate a spawning migration of mature toothfish from the continental slope region to the northern Ross Sea region. The 58 day survey showed that spawning of D. mawsoni began on some seamounts by early July. No changes were detected between winter and summer in length, age, sex ratio or condition factor distributions for D. mawsoni in the northern Ross Sea as hypothesized following a spawning migration from the slope to the northern Ross Sea region. These results suggest that the distribution of D. mawsoni in the Ross Sea is mainly accomplished through ontogenetic migration and not annual return spawning migrations.

Keywords

gonadosomatic indexmigrationsex ratiospawn timing
Type
Biological Sciences
Information
Antarctic Science , Volume 31 , Issue 5 , October 2019 , pp. 243 - 253
Copyright
Copyright © Antarctic Science Ltd 2019 

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