Early ontogeny of the mackerel icefish, Champsocephalus gunnari, in the southern Scotia Arc

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• 作者：Mario La Mesa (1)
  Barbara Catalano (2)
  Philippe Koubbi (3)
  Christopher D. Jones (4)
  
• 关键词：Age and growth ; Yolk ; sac larvae ; Channichthyid ; Bransfield strait ; Southern Ocean
• 刊名：Polar Biology
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：36
• 期：6
• 页码：797-805
• 全文大小：476KB
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• 作者单位：Mario La Mesa (1)
  Barbara Catalano (2)
  Philippe Koubbi (3)
  Christopher D. Jones (4)
  
  1. ISMAR-CNR, Istituto di Scienze Marine, Sede di Ancona, Largo Fiera della Pesca, 60125, Ancona, Italy
  2. ISPRA, Istituto Superiore per la Protezione e la Ricerca Ambientale, Via di Casalotti 300, 00166, Rome, Italy
  3. Laboratoire d’Océanographie de Villefranche (LOV), CNRS UMR 7093 Université Paris VI, Station Zoologique, La Darse, BP 28, 06230, Villefranche-Sur-Mer, France
  4. Antarctic Ecosystem Research Division, Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 8901 La Jolla Shores Dr, La Jolla, CA, 92037, USA
  
• ISSN：1432-2056

文摘

During the early ontogeny of fishes, the timing and duration of key events such as larval hatching and the switch from endogenous to exogenous feeding largely determine the offspring viability and survival. The aim of the present study was to investigate the life history traits of the early larvae of the mackerel icefish, Champsocephalus gunnari, collected in summer south of the South Shetland Islands in the Bransfield Strait and north of Elephant Island. Through the analysis of sagittal otolith microstructure, we assessed the timing and duration of egg incubation, larval hatching, first exogenous feeding, rate of yolk resorption and body growth rate. Compared to populations living further north (i.e. around South Georgia and Kerguelen Islands), mackerel icefish in the southern Scotia Arc exhibits longer egg incubation (lasting 90-20?days from winter to summer) and delayed hatching time spread over a relatively short period lasting 26?days between January and February. The first exogenous feeding takes place between 13 and 24?days after hatching still in the presence of the yolk-sac, indicating a prolonged mixed feeding afterward. The specific growth rate or daily percentage change in size (G) was 1.9?% SL day?, corresponding to a daily growth rate at mean size of 0.31?mm?day?. While showing significant differences in early life history traits across their geographical distribution, C. gunnari populations share a common strategy, spawning a small number of large eggs that hatch in relatively large-sized larvae, at a time which may be independent of the timing of pack-ice retreat and onset of the production cycle.