“Temperature effects on growth, feeding rate and feed conversion of the Pacific white shrimp (Penaeus vannamei)” (Wyban et al 1995)

Citation: Wyban, J., Walsh, W., and Godin, D. (1995). “Temperature effects on growth, feeding rate and feed conversion of the Pacific white shrimp (Penaeus vannamei).” Aquaculture, 138(1-4), pp. 267-297. DOI: 10.1016/0044-8486(95)00032-1

Summary By: Alexandra Pounds

Image Credit: Flickr

  • Big Picture: As shrimp grow, the optimum temperature for growth decreases. Different sized shrimp require different temperatures for optimum growth. FCR was more related to shrimp size than to temperature, where smaller shrimp had better FCRs.
  • This experiment tests the effects of temperature on juvenile growth rate, feeding rate, and feed conversion.
  • Methods:
    • 4 experiments: 4 different temperatures, 3 different stocking sizes
    • Indoor laboratory setting (recirculating system), big enough to allow room for normal swimming behaviour
    • System, water quality, flow rates, photoperiod, and feed were standardized across all tanks
    • Shrimp were stocked at 50 shrimp / m3
    • Feed consumption was calculated by feed supplied minus residual feed (visually estimated feed at bottom of tank)
    • Used pond water (and sea water at the end to test if there was a difference)
    • Temperature was measured twice daily
    • Statistics used: one-way ANOVA, orthogonal contrast, and multivariate F-tests
  • Results:
    • Shrimp grew bigger and ate more with warmer temperatures.
    • FCR depended on stocking size, but not temperature. FCR was inversely related to size: Larger shrimp had less efficient FCRs.
    • Smaller shrimp ate more food at all temperatures.
    • Optimum temperature was size-specific. Large shrimp had optimum temperature of 27 deg C, while small shrimp (<5g) had an optimum temperature of over 30 deg C.
      • Reduced feeding & growth below 23 deg C for all sizes
      • Reduced feeding & growth above 30 deg C for large shrimp
      • Optimum temperatures for growth:
        • Small shrimp: >30 deg C
        • Medium shrimp: 30 deg C
        • Large shrimp: 27 deg C
      • Optimum temperatures for lowest FCR:
        • Small shrimp: FCR unaffected by temperature
        • Medium shrimp: 27-30 deg C
        • Large shrimp: 27 deg C
      • As shrimps get bigger, they become less efficient at growth and more sensitive to temperature
  • Limitations
    • Dissolved oxygen (DO) was not constant across tanks, as dissolved oxygen is lower when temperatures are higher. However, DO was always above 90% saturation.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s