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Effects of varying temperature and food availability on growth and reproduction in first-time spawning female Atlantic cod
Yoneda, M. (2005). Effects of varying temperature and food availability on growth and reproduction in first-time spawning female Atlantic cod. J. Fish Biol. 67(5): 1225-1241. http://dx.doi.org/10.1111/j.1095-8649.2005.00819.x
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112; e-ISSN 1095-8649, meer
Peer reviewed article  
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Trefwoorden
    ANE, British Isles, Scotland
    Food
    Population functions > Growth
    Properties > Physical properties > Thermodynamic properties > Temperature
    Vitellogenesis
    Gadus morhua Linnaeus, 1758 [WoRMS]
    Scotland [Marine Regions]
    Marien/Kust
Author keywords
    Energy allocation
Auteur  Top 
  • Yoneda, M.
Abstract
    The somatic growth, sexual maturation and fecundity of individually marked first-time spawning female Atlantic cod Gadus morhua were examined under different varying temperature and feeding regimes over the months preceding spawning. A negative correlation between somatic and oocyte growth was found, reflecting the changing energy allocation pattern. Nevertheless, the somatic growth of mature individuals was at least as high as those of immature fish over the period of vitellogenesis. Potential fecundity was positively correlated with body size, but neither temperature or feeding regime significantly affected this relationship. Consequently, fish with unlimited feeding opportunity invested more energy into somatic growth during vitellogenesis compared to those held under a restricted ration. This indicated that once Atlantic cod had made the decision to invest in first reproduction, they allocated a certain amount of energy relative to their size into egg production and any surplus was invested into somatic growth. Low temperature led to an arrest in the onset of vitellogenesis and significantly affected the number of females that matured.
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