scholarly journals Low turbidity in recirculating aquaculture systems (RAS) reduces feeding behaviour and increases stress-related physiological parameters in pikeperch (Sander lucioperca) during grow-out

2021 ◽  
Author(s):  
Stephan S W Ende ◽  
Ekaterina Larceva ◽  
Mirko Bögner ◽  
Vincent Lugert ◽  
Matthew James Slater ◽  
...  
Keyword(s):  
Feed Intake ◽  
Economic Consequences ◽  
Feeding Time ◽  
Sander Lucioperca ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Body Weights ◽  
High Turbidity ◽  
And Performance ◽  
Species Specific

Abstract There is a tendency to farm fish in low turbidity water when production takes place in the land-based recirculating aquaculture systems (RAS). However, the effect of water turbidity on stress and performance is unknown for many species cultured in RAS. The effect of different turbidity treatments as Formazine Attenuation Units (0 FAU, 15 FAU, and 38 FAU) on feed intake performance (latency, total feeding time, and total feed intake) and physiological blood stress parameters (cortisol, lactate, and glucose) in medium-sized pikeperch ((Sander lucioperca) n = 27, undetermined sex and age) of initial body weights of 508.13g ± 83 g (at FAU 0, 15 and 38, respectively) was investigated. The rearing system consisted of 9 rectangular tanks (200 L per tank). Fish were housed individually (n = 1, per tank, n replicates per treatment = 9). All tanks were connected to a recirculation system equipped with a moving bed biofilter. Feed intake in pikeperch kept at low turbidity (0 FAU) was 25% lower than pikeperch kept at high turbidity (38 FAU) (P<0.01) and also significantly (10.5%) lower compared to feed intake in pikeperch kept at intermediate turbidity (15 FAU) (P<0.01 for 0 FAU vs 15 FAU, feed intake sign. Value as the main effect is P<0.01). Pikeperch kept at low turbidity showed significantly slower feeding response (latency time) towards pellets entering the tank, shorter feeding times (both P< 0.05), and higher glucose blood concentration (73%) in contrast to pikeperch kept at highest turbidity. A reduction of 25% feed intake has obvious economic consequences for any fish farm and present data strongly emphasize the importance of considering the species-specific biology in future RAS farming.

scholarly journals Impact of light intensity on the results of rearing juvenile pikeperch, Sander lucioperca (L.), in recirculating aquaculture systems

2010 ◽  
Vol 18 (2) ◽  
Author(s):  
Michał Kozłowski ◽  
Zdzisław Zakęś ◽  
Mirosław Szczepkowski ◽  
Krzysztof Wunderlich ◽  
Iwona Piotrowska ◽  
...  
Keyword(s):  
Light Intensity ◽  
Sander Lucioperca ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

Effect of litter condition, antibiotics, barley and lucerne meal on egg yolk colour and performance of crossbred layers

1977 ◽  
Vol 17 (89) ◽  
pp. 926 ◽  
Author(s):  
H Karunajeewa ◽  
I Bagot
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Egg Production ◽  
Egg Yolk ◽  
Feed Conversion ◽  
Body Weights ◽  
Weight Gains ◽  
Egg Yolks ◽  
And Performance ◽  
Haugh Unit

The effects of litter condition, antibiotics, barley and lucerne meal on the pigmentation of egg yolks and performance of crossbred layers were examined in two factorial experiments. In both experiments pigmentation of egg yolks was depressed by barley and improved either by 6 per cent lucerne meal in the diet or by housing the birds on wet litter. There were significant interactions between litter condition, antibiotics, lucerne meal and cereals on yolk colour, egg production and efficiency of feed conversion. In experiment 1, young pullets laid fewer eggs when fed diets with 57.2 per cent barley plus 6 per cent lucerne meal. This depression in egg production was alleviated by antibiotics. Feed intake was increased and feed conversion efficiency and body weight gains were decreased by barley, whereas lucerne meal decreased both feed intake and body weight gains. Pullets on wet litter laid larger eggs with lower Haugh unit scores. In experiment 2, older hens laid more eggs on diets with 6 per cent lucerne meal, particularly in the absence of barley and when housed on dry litter. Body weights of these hens were decreased by barley.

Effects of restricting the feeding time of egg-type pullets at different ages during rearing on body weights and subsequent laying performance

1978 ◽  
Vol 18 (90) ◽  
pp. 70 ◽  
Author(s):  
S Abu-Serewa
Keyword(s):  
Feed Intake ◽  
Adult Mortality ◽  
Feeding Time ◽  
Early Feeding ◽  
Economic Return ◽  
Laying Performance ◽  
Significant Difference ◽  
Body Weights ◽  
Ad Libitum ◽  
Medium Weight

The effects on body weight and laying performance of restricting the feeding time of medium weight crossbred pullets to 6 or 8 hours in every 48 hours from 6, 9 or 12 to 20 weeks of age were studied in a factorial experiment. Before the start of the restriction programme, half of the pullets were fed ad libitum; the other half were not fed on Wednesday and Sunday of each week from three weeks of age. The control birds were fed ad libitum throughout the rearing phase. The feed intake and the weight of pullets at the end of the restriction programme at 20 weeks were reduced by between 17 and 40 per cent and between 18 and 33 per cent, respectively, compared with the control, depending on the early feeding regime and the duration of restriction. The average age at 50 per cent production of the restricted treatments was delayed by 15 days compared with the controls. No significant difference was found in the laying performance of the restricted birds or between any of these and the controls. The restricted birds however were less efficient in converting their feed to eggs than the control birds. Rearing and adult mortality were not affected by restriction. The results suggested that for maximum economic return the restriction programme should not be delayed beyond 6 weeks and should continue to 20 weeks of age. Delaying the start of the restriction programme beyond 6 to 9 or 12 weeks of age will reduce the saving in feed intake from approximately 35 to about 29 and 17 per cent of feed consumed by full-fed birds at 20 weeks respectively.

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