Effects of colored light and tank color on growth indices and some physiological parameters of juvenile beluga (Huso huso)

Abstract

The influence of colored light and tank color was investigated on growth performance (body weight, growth rate, carcass composition, etc.) and physiological status (blood and plasma parameters) of beluga (Huso huso) juveniles. The study was conducted using 64 specimens for colored light treatments with initial weight 98.83 ± 1.42 (mean ± SE) g which were reared under white, red, green and blue light and using 80 specimens for tank color treatments with initial weight 98.50 ± 1.24 (mean ± SE) g which were reared in white, red, green, black and blue tanks, all for 12 weeks. Red light had a significantly negative impact on beluga growth performance (in contrast with blue light) accompanied with reduced liver total lipids and plasma albumin and elevated plasma cortisol, glucose, cholesterol and triglyceride (in contrast with the other treatments). No significant effects of tank color were detected on growth performance. Nevertheless, most of growth parameters suggested a positive impact of black tank. Although plasma glucose levels in white tank were significantly higher than the other tank colors, no significant effects of tank color were detected for the other physiological parameters. Therefore, based on the obtained results, blue light by establishing comfort in beluga juveniles spelled increased growth performance and had positive significant effect on physiological conditions. Moreover, taking into consideration the consistency of all growth parameters among beluga juveniles reared in black tanks, it is suggested that considerable results in regard to this treatment may be achieved if the rearing period prolongs.

Effects of background colour on growth indices and stress of young sterlet ( Acipenser ruthenus ) in a closed circulated system

“…In another study, the glucose level of perch ( Perca fluviatilis ) was increased after stress treatment (Jentoft, Aastveit, Torjesen & Andersen ). In grate sturgeon ( Huso huso ), plasma cortisol and glucose deceased when reared in black, dark blue and grey tanks (Banan, Kalbassi, Bahmani & Sadati ). However, in a number of studies on Ictalurus punctatus , O. mykiss , Hemitripterus americanus , Cyprinus carpio , no significant correlation was found between blood glucose and liver glycogen with plasma cortisol (Davis, Torrance, Parker & Suttle ; Andersen, Reid, Moon & Perry ; Vijayan, Mommsen, Gl, Eacute, Met & Moon, ; Papoutsoglou et al .…”

Optimal background colour for rearing Asian seabass (Lates calcarifer)

“…Varying trends in carcass composition caused by tank background colour have been previously reported in various fish species. No significant differences in composition were observed in scaled carp reared in black, white or green tanks (Papoutsoglou et al, ) or in beluga ( Huso huso ) reared in black, white, green, red or blue tanks (Banan et al, ); nor in thinlip mullet ( Liza ramada ) reared in black, white, green, red, yellow or blue tanks (El‐Sayed & El‐Ghobashy, ). In the current study, some negative effects in both lipid and ash content were found in fish reared only on red background not for blue and black backgrounds, while unchanged proximate compositions were observed for the remaining treatments.…”

The effect of environmental colour on the growth, metabolism, physiology and skin pigmentation of the carnivorous freshwater catfish Lophiosilurus alexandri

“…In L . alexandri juveniles, the different environmental colours did not alter the plasma protein, triglyceride and cholesterol levels, similar to that which was also recorded for C. carpio (Papoutsoglou et al ., ), Huso huso L. 1758 (Banan et al ., ) and Carassius auratus (L. 1758) (Eslamloo et al ., ) reared in different colour tanks. In contrast, the haematocrit level did vary and was greatest for fish kept in white tanks.…”