Bioenergetics and nitrogen balance of the European eel (Anguilla anguilla) fed at high and low ration levels

S F Owen, D F Houlihan, M J Rennie, J H van Weerd

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Abstract

European eel (Anguilla anguilla) were fed either high or low ration levels (1.33 and 0.48% body weight.day(-1)). Eight periods of continuous 24-h respirometry in flow-through conditions were conducted over 70 days to simultaneously examine nitrogen and energy budgets without resorting to the calculation of parameters by difference. Food and oxygen consumption; ammonia, urea, and nitrate-nitrite excretion; and growth production were measured. Nitrogen budgets successfully accounted for 89.6-101.2% of the consumed nitrogen. Energy budgets accounted for 53.4-92.3% of the consumed energy. From the ammonia quotients (AQ), 54.4-57.7% of the available protein was oxidized at high ration, and 59.7-133.5%, at low ration level. To satisfy maintenance requirements, 0.28 mg N.g(-1).day(-1) was required. At 25 degrees C eels were calculated to have a rate of standard metabolism of 83.3 J.g(-1).day(-1), which is comparable with the range published for other species at this temperature. These data suggest that eels do not have a particularly low metabolic rate, as is commonly assumed in the eel rearing industry, and that the relatively inactive lifestyle associated with the eel masks a metabolic rate in common with other, more active, fish.

Original languageEnglish
Pages (from-to)2365-2375
Number of pages11
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume55
Publication statusPublished - 1998

Keywords

  • CTENOPHARYNGODON-IDELLA VAL
  • ENERGY BUDGET
  • GRASS CARP
  • 6 TELEOSTS
  • BODY-SIZE
  • OXYGEN-CONSUMPTION
  • AMMONIA EXCRETION
  • GROWTH
  • TEMPERATURE
  • FISH

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