Biological traits of a sub-Antarctic nototheniid, Patagonotothen ramsayi, from the Burdwood Bank

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• 作者：Mario La Mesa ; Emilio Riginella ; Valentina Melli ; Fabrizio Bartolini…
• 关键词：Age structure ; Reproduction ; Patagonotothen ; Subantarctic ; Southern Ocean
• 刊名：Polar Biology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：39
• 期：1
• 页码：103-111
• 全文大小：1,561 KB
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• 作者单位：Mario La Mesa (1)
  Emilio Riginella (2)
  Valentina Melli (2)
  Fabrizio Bartolini (3)
  Carlotta Mazzoldi (2)
  
  1. CNR, Institute of Marine Sciences, UOS Ancona, Ancona, Italy
  2. Department of Biology, University of Padova, Padua, Italy
  3. ECOMERS Lab, University of Nice - Sophia Antipolis, Nice, France
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Oceanography
  Microbiology
  Plant Sciences
  Zoology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2056

文摘

The rock cod Patagonotothen ramsayi (Regan 1913) is the most abundant species of the genus Patagonotothen, occurring along the Patagonian shelf. It plays an important role in the demersal food web both as prey and predator, showing an increasing importance for the local finfish and squid trawl fisheries. Age structure and the reproductive traits were investigated from the population inhabiting the eastern shelf of Burdwood Bank, which represents the southernmost area of its geographical distribution. Adult specimens of P. ramsayi were collected during bottom trawling carried out in the austral summer. The specimens were aged by otolith readings, and their reproductive characteristics were assessed by macroscopical and histological analyses. Age was similar between sexes, ranging from 4 to 7 and from 4 to 8 years in males and females of comparable size, respectively. GSI was relatively low in females (<1.5 %), as fish were sampled far from the reported spawning season (June–August). Females were all in the early developing stage (III) on the macroscopic maturity scale, with the most advanced oocytes being in early vitellogenesis. The oocyte size distribution was bi-modal, with two partially overlapping modes consisting of oocytes of a maximum size of 0.66 mm. A few large atretic oocytes (diameter > 1 mm) were found in three females. Absolute fecundity ranged from approximately 30 to 120 thousands of eggs. No relationship was found between female size and fecundity, probably due to the relatively narrow range of the investigated fish sizes. Males were in the spent (VII) or resting (II) stages.