The interaction of temperature and salinity on growth and food conversion in juvenile turbot (Scophthalmus maximus)

Abstract The effects of temperature and salinity on growth and feed conversion of juvenile turbot (initial mean weight 14 g) were investigated by rearing fish at (mean±SD) 10±0.2°C, 14±0.2°C, 18±0.3°C and 22±0.2°C and 15±0.4‰, 25±0.4‰ and 33.5±0.1‰ for 3 months. Growth, food consumption, and food conversion efficiency were highest at 15‰, and lowest at 33.5‰. There was an interactive effect of temperature and salinity at the two highest temperatures (18°C and 22°C) but not at 10°C and 14°C. The optimal temperature for growth (Topt. G) varied with salinity: Topt. G at 33.5‰ was 19.6±0.3°C (±SEM), whereas the Topt. G at 15‰ was 22.9±1.0°C, and at 25‰ was 24.7±2.1°C. A similar trend was found for food conversion efficiency (FCE). The optimal temperatures for FCE were 17.4±0.5°C, 17.9±1.0°C and 19.0±0.9°C at 33.5‰, 25‰ and 15‰, respectively. Overall, we found the optimal temperature–salinity combination for growth to be 21.8±0.9°C and 18.5±0.8‰. The optimal temperature–salinity combination for food conversion efficiency was found to be 18.3±0.6°C and 19.0±1.0‰. It is concluded that growth and food conversion efficiency of juvenile turbot can be improved by rearing them at intermediate salinities in the upper temperature range.

[1]  L. M. Sunde,et al.  The interaction of temperature and fish size on growth of juvenile turbot , 1996 .

[2]  G. Taranger,et al.  Sexual dimorphism in growth and maturation of turbot, Scophthalmus maximus (Rafinesque, 1810) , 1997 .

[3]  J. R. Stauffer,et al.  Combined effects of water temperature and salinity on growth and feed utilization of juvenile Nile tilapia Oreochromis niloticus (Linneaus) , 1996 .

[4]  M. Kerstan.  The importance of rivers as nursery grounds for 0- and 1-group flounder (Platichthys flesus L.) in comparison to the Wadden sea , 1991 .

[5]  S. McCormick,et al.  The effect of salinity and ration level on growth rate and conversion efficiency of Atlantic salmon (Salmo salar) smolts , 1989 .

[6]  N. H. Timm.  2 Multivariate analysis of variance of repeated measurements , 1980 .

[7]  A. Sévère,et al.  Effects of temperature on growth and metabolism in juvenile turbot , 1996 .

[8]  J. Gutt.  The growth of juvenile flounders (Platichthys flesus L.) at salinities of 0, 5, 15 and 35%% , 1985 .

[9]  S. R. Reddy,et al.  Food intake, growth, food conversion, and body composition of catfish exposed to different salinities , 1979 .

[10]  W. C. Guenther,et al.  Analysis of variance , 1968, The Mathematical Gazette.

[11]  Y. Lambert,et al.  Effects of Intermediate and Low Salinity Conditions on Growth Rate and Food Conversion of Atlantic Cod (Gadus morhua) , 1994 .

[12]  G. Iwama,et al.  Effects of Salinity on Growth, Metabolism, and Ion Regulation in Juvenile Rainbow and Steelhead Trout (Oncorhynchus mykiss) and Fall Chinook Salmon (Oncorhynchus tshawytscha) , 1991 .

[13]  S. Campana,et al.  Recent Developments in Fish Otolith Research , 1995 .

[14]  A. Folkvord,et al.  Growth, oxygen consumption and activity of juvenile turbot (scophthalmus maximus L.) reared under different temperatures and photoperiods , 1995 .

[15]  R. Kilambi.  Food consumption, growth and survival of grass carp Ctenopharyngodon idella Val at four salinities , 1980 .

[16]  T. Targett,et al.  Feeding, growth and survival of juvenile summer flounder Paralichthys dentatus:Experimental analysis of the effects of temperature and salinity. , 1991 .

[17]  H Meiners,et al.  [Effects of temperature]. , 1973, ZWR.

[18]  H. Levene.  Robust tests for equality of variances , 1961 .

[19]  W. E. Simpson,et al.  Determination of ammonium in Kjeldahl digests of crops by an automated procedure , 1971 .

[20]  J. R. Brett,et al.  Bioenergetics and growth , 1979 .

[21]  G. Enderlein,et al.  Scheffé, H.: The Analysis of Variance. Wiley, New York 1959, 477 Seiten, $ 14,00 , 1961 .

[22]  U. Waller.  Factors influencing routine oxygen consumption in turbot, Scophthalmus maximus , 1992 .

[23]  O. Torrissen,et al.  Antioxidant status and immunity in Atlantic salmon, Salmo salar L., fed semi‐purified diets with and without astaxanthin supplementation , 1995 .

[24]  Frederic Gaumet.  Contribution a l'etude des capacites d'adaptation au milieu et de croissance chez le turbot (scophthalmus maximus) en fonction des facteurs ecologiques, salinite et temperature , 1994 .

[25]  J. R. Brett.  10 - Environmental Factors and Growth , 1979 .

[26]  A. Sévère,et al.  Effects of salinity on the ionic balance and growth of juvenile turbot , 1995 .

[27]  D. Peters,et al.  The effect of temperature, salinity, and availability of food on the feeding and growth of the hogchoker, Trinectes maculatus (Bloch & Schneider) , 1972 .

[28]  J. P. Thorpe,et al.  Effects of reduced salinity on growth and body composition in the European bass Dicentrarchus labrax (L.) , 1985 .

[29]  D. Evans.  8 The Roles of Gill Permeability and Transport Mechanisms in Euryhalinity , 1984 .

[30]  B. L. Olla,et al.  The effects of temperature and salinity on growth and feed utilization of juvenile, sex-reversed male Florida red tilapia cultured in a recirculating system , 1993 .