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Energy Requirements/growth. Daily energy requirement (kcal/unit bwt) Overall energy requirement/fish increases with size (related to increased biomass) Metabolism – Requires energy (nutritional) reproduction, maintenance and growth. Energy Requirements/growth. Metabolism (cont.)

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slide1

Energy Requirements/growth

  • Daily energy requirement (kcal/unit bwt)
  • Overall energy requirement/fish increases with size (related to increased biomass)
  • Metabolism –
        • Requires energy (nutritional)
        • reproduction, maintenance and growth
slide2

Energy Requirements/growth

  • Metabolism (cont.)
    • Gross energy (GE) –
    • Digestible energy (DE) – energy available for metabolism and growth
    • DE = GE – FE (fecal energy)
    • Metabolizeable energy (ME) –
      • Can be affected by env. conditions – respiration energy (RE) and energy in urine/gills (UE)
      • ME = DE – (RE + UE)
slide3

Energy Budget

Basal/heat met. increase

(swimming E)

Fecal

Energy

Metabolized

Gross

Energy

Recovered

(tissues, gametes)

Digestible

Energy

Excreted

(urine, gills,

Body surface)

slide4

Food Conversion Ratio (FCR)

  • FCR = Feed fed (dry wt. basis)/weight gain
    • amount of feed to produce one unit weight gain
    • Fish – very efficient converters (FCR’s < 1.0)
  • To estimate FCR for feed being used:
    • FCR = E/(ME * 1000)
    • E: metabolizeable kcal required for 1 unit weight gain
    • ME: kcal per g of feed
slide5

Feeding rates

  • Do not overfeed!!
    • Fish fed ad libitum or on a % body wt basis
    • Feed to satiation?
  • Calculation of daily feed requirements:
    • Adjust based on estimated growth (% daily gain)
    • Should adjust as often as possible
    • Feeding tables – based on length and temperature
slide6

Feeding rates

  • Methods to calculated feeding rates: (can be based on length or weight increases)
  • Method#1 (assumes linear growth rate)
  • Wt = Wo + F/C
  • Method#2 (assumes logarithmic growth)
  • Wt = Woekt
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