Sexual dimorphism of fast muscle fibre recruitment in farmed Atlantic halibut (Hippoglossus hippoglossua L.).

O Hagen, C Solberg, Ian Alistair Johnston

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Commercially farmed Atlantic halibut (Hippoglossus hippoglossus) were reared at the Aga Marin's facility located on Donna (Norway) under ambient environmental conditions in duplicate 15 x 15 x 8 m netpens (May 2004 to May 2005). Twenty fish were sampled five times over a twelve month production period during which time the average body weight increased from 1.26 to 2.08 kg (n = 100 fish). Body mass, fork length (L-F), and the number and size distributions of fast muscle fibres were determined in male and female fish. All males matured during the autumn whereas no maturation was observed in females. From the point of maturation females had superior growth performance to males and body mass and the total cross-sectional area of muscle were 1.4-fold (P < 0.05) and 1.3-fold higher (P < 0.01) respectively by May 2005. The total number of fast muscle fibres per trunk crosssection at 0.55 L-F was 24.5% higher in females (7.58 x 10(5)) than males (5.80 x 10(5)) prior to sexual maturation. In females, muscle fibre recruitment slowed with short days and low water temperatures (< 6.5 degrees C), but had increased to 1.01 x 10(6) by May 2005 (P < 0.001). In contrast, there was no growth and no increase in muscle fibre number in males following the onset of maturation. The distribution of muscle fibre diameters prior to maturation in males was also significantly different between male and female fish matched for L-F. The results illustrate a sexual dimorphism of muscle fibre recruitment patterns in Atlantic halibut and highlight the adverse affects of sexual maturation in males on muscle growth. (c) 2006 Elsevier B.V All rights reserved.

Original languageEnglish
Pages (from-to)1222-1229
Number of pages8
JournalAquaculture
Volume261
DOIs
Publication statusPublished - 11 Dec 2006

Keywords

  • Atlantic halibut
  • growth
  • maturation
  • sexual dimorphism
  • muscle fibre number
  • muscle fibre diameter
  • hypertrophic growth
  • SALMO-SALAR L.
  • JUVENILE HALIBUT
  • GROWTH-PERFORMANCE
  • SOMATIC GROWTH
  • TEMPERATURE
  • SIZE
  • MATURATION
  • PHOTOPERIOD
  • METABOLISM
  • BEHAVIOR

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