Effects of temperature on growth and metabolism in juvenile turbot

Abstract

The effects of constant temperatures on growth, food efficiency, and physiological status were studied in four different batches of juvenile turbot. The growth responses were studied in three experiments lasting 70-85 days under 8-20 C thermal conditions. There was a positive correlation between growth and temperature from 8 to 17 C and a plateau was observed from 17 to 20 C. In fish fed to satiety, specific growth rate was positively correlated to the food intake, which was double at 20 C, compared with 8 C. Minor changes were observed in food efficiency. Body fat deposition decreased as temperature increased (25% lower at 20 C, compared with 8 C). Apparent food conversion, PER (protein efficiency ratio) and PUC (protein utilization coefficient) ranges were 0·8-0·9, 2·1-2·3 and 33-38% respectively. In 70-300 g fish, routine MO 2 increased (2·5-6·5 mol O 2 h 1 g bw 1 ) with temperature up to 20 C, while larger turbot (500-600 g) appeared relatively thermo-independent, with a lower oxygen consumption (1·5 mol h 1 g 1 ). The average daily total ammonia nitrogen (TAN) and urea-N excretion per fish biomass was positively related to temperature. TAN was 30% lower at 8 C, compared with 20 C. Ingested nitrogen was mainly excreted under the final form of TAN, urea-N representing 26% of the total amount. A post-prandial peak in TAN and a delayed peak in urea-N nitrogen were observed. The hydromineral status [osmolarity, sodium, chloride and potassium blood plasma, gill (Na + -K + )-ATPase activity] of turbot was not affected by progressive changes in temperature during the acclimation period. Juvenile turbots show remarkable homeostatic capacities and so they have a relatively thermo-independent physiology within the range of temperature studied. 1996 The Fisheries Society of the British Isles

Interaction of temperature and photoperiod on growth of Atlantic halibut Hippoglossus hippoglossus L.

“…1). This is in accordance with previous findings for turbot ( Burel, Le‐Ruyet, Gaumet, Le Roux, Sevère & Boeuf 1996), plaice and flounder ( Fonds, Cronie, Vethaak & Van Der Puly 1992). In fish, increased temperature leads to increased metabolism, and a higher feeding rate is necessary to achieve a good growth rate ( Brett 1979).…”

Stressor interactions in freshwater habitats: Effects of cold water exposure and food limitation on early‐life growth and upper thermal tolerance in white sturgeon, Acipenser transmontanus

“…Fish exposed to rapid decreases in temperature outside this range typically exhibit metabolic depression (Ibarz et al, 2007), lowered swimming performance (Fangue, Mandic, Richards, & Schulte, 2007;Rodgers et al, 2014), reduced CTMax (Healy & Schulte, 2012;Schulte, Healy, & Fangue, 2011), and immunosuppression (Bly & Clem, 1992;Le Morvan, Troutaud, & Deschaux, 1998). Low temperatures also have pronounced, depressive effects on fish growth rates (Burel et al, 1996). For example, cold water releases from dams significantly curbed larvae growth of four teleost species in the Colorado River, U.S.A. (Robinson & Childs, 2001).…”

The effect of sexual dimorphism on growth of the black sea turbot, Psetta maxima

“…The production of the turbot has been attempted since the 1970's in some European countries due to its high commercial value, and in recent years the commercial culture of this species has benefited from improvements in larval rearing methods, and nutrition and husbandry practices in the ongrowing phase (Jones, 1973;Person-Le Ruyet and Noel, 1982;Burel et al, 1996;Mallekh et al, 1998;Irwin, 1999). However, large individual variations in growth performance have been observed in turbot (Rosenberg and Haugen, 1982;Imland et al 1995) and there is a need to optimize production characteristics (Lavens and Remmerswaal, 1994).…”