Energy Requirements/growth
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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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Energy Requirements/growth

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Energy requirements growth

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

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)


Energy requirements growth

Energy Budget

Basal/heat met. increase

(swimming E)

Fecal

Energy

Metabolized

Gross

Energy

Recovered

(tissues, gametes)

Digestible

Energy

Excreted

(urine, gills,

Body surface)


Energy requirements growth

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


Energy requirements growth

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


Energy requirements growth

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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