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Polar Biology

, Volume 42, Issue 12, pp 2237–2247 | Cite as

Spatial distribution and population structure of juvenile Antarctic toothfish (Dissostichus mawsoni) in the South Shetland Islands

  • Mario La MesaEmail author
  • Emilio Riginella
  • Christopher D. Jones
Original Paper

Abstract

As most of biological and ecological features of the Antarctic toothfish have been provided almost exclusively by the recent fishery exploitation in the Ross Sea targeting adult fishes, the early life history of this species is fragmentary and still needs to be fully addressed. Aiming to fill this gap, we provide new insights on the spatial distribution and population structure of juvenile D. mawsoni caught during bottom trawl surveys on the shelves around the South Shetland Islands (CCAMLR Subarea 48.1). Juveniles were relatively evenly distributed on the northern shelf of the South Shetlands and all around Elephant Island, with a few specimens caught in the Bransfield Strait. Although the specimens were caught in all depth strata surveyed, they were most abundant between 100 and 300 m depth, with an evident shift towards deeper waters with ontogeny. The sampled population consisted of 150 juveniles measuring between 22 and 78 cm TL, equally distributed between sexes, most of them with gonads at an immature stage of maturity. Both sexes showed a positive allometric body growth, indicating healthy body condition. Based on counts of annual growth increments from sagittal otolith sections, age estimates ranged between 2 and 7 years in males and between 2 and 8 years in females, respectively. Annual growth rate was estimated from the age-length keys, spanning from 5 to 10 cm TL. Integrating population structure with early life history of juvenile D. mawsoni, we provide some indication on connectivity between the investigated nursery area and potential neighbouring spawning areas.

Notes

Acknowledgements

We are much indebted to the Alfred Wegener Institut für Polar und Meeresforschung and the U.S. Antarctic Marine Living Resources Program for giving us the opportunity to collect juveniles of D. mawsoni during their finfish trawl surveys in CCAMLR Subarea 48.1. We wish to thank all scientific staff, crew members and personnel aboard the vessels for their essential support in sampling activities. We are very grateful to Joseph T. Eastman, Mauricio F. Landaeta and an anonymous reviewer for their constructive comments on the early draft of manuscript. This study was financially supported by the Italian National Program for Antarctic Research (PNRA) (research project 2013/C1.07).

Compliance with ethical standards

Conflicts of interest

The authors declare to have no conflicts of interest and that all applicable institutional, national or international guidelines for the use and care of animals have been strictly followed in the study.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.CNR, Institute of Polar Sciences, c/o Area Di Ricerca Di BolognaBolognaItaly
  2. 2.Department of Integrative Marine EcologyZoological Station Anton DohrnNaplesItaly
  3. 3.Southwest Fisheries Science Center, National Marine Fisheries ServiceNOAALa JollaUSA

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