A preliminary study of comparative growth rates in O-group malpigmented and normally pigmented turbot, Scophthalmus maximus (L.), and turbot-brill hybrids, S. maximus×S. rhombus (L.), at two temperatures

  • Heap S
  • Thorpe J
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The growth rates and food conversion efficiencies of juvenile normally pigmented turbot, malpigmented turbot and turbot-brill hybrids were measured at 10°C and 14°C. The survival rate over the 120-day experimental period was 96%. Results showed no evidence of hybrid vigour (heterosis), and in fact significantly higher growth rates were observed in turbot. All three types of fish grew faster at the higher environmental temperature due mainly to a much improved appetite, but also perhaps due to an increase in the food conversion efficiency. Malpigmented turbot appeared particularly well suited to the conditions associated with intensive culture and exhibited the highest growth rates at both 10 and 14°C. For malpigmented turbot at 14°C the mean growth rate was 2.17% per day. © 1987.

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  • S. P. Heap

  • J. P. Thorpe

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