Turkish Journal of Fisheries and Aquatic Sciences
2019, Vol 19, Num, 10 (Pages: 885-891)
Effect of feed protein level on water chemical and technological parameters of a recirculating aquaponics system for carp (Cyprinus carpio L.) and lettuce (Lactuca sativa L.) farming
Stefka Stoyanova 1 ,Ivaylo Sirakov 1 ,Katya Velichkova 1 ,Mustafa Ali 1
1 Trakia University, Faculty of Agriculture, Department of Biology and Aquaculture, 6000, Stara Zagora, Bulgaria
DOI :
10.4194/1303-2712-v19_10_08
Viewed :
3633
-
Downloaded :
2578
Aquaponics is a system integrating hydrobionts farming with cultivation of plant
species (vegetables, spice herbs, flowers etc.). The aim of the present study was to
establish the effect of feeds with different protein content (24% and 28%) on water
chemical and technological parameters of a recirculating aquaponic system for carp
(Cyprinus carpio L.) and lettuce (Lactuca sativa L.) farming. The experiment was
conducted in 2 variants, each of 30-day duration, comprising feeding carps with
pelleted feed either with 24% crude protein or 28% crude protein, with pellet size of
3.5 mm. Each of variants comprised 12 fish with uniform initial weight (563±0.1 and
0.566±0.3 g respectively), without significant difference (P≥0.05) and 17 plants in 2nd
germination week. In fish growth performance traits at the end of experiments showed
higher body weight in carps in the variant with 28% dietary protein (by 4.4%) and total
body length (by 1.4%) as compared to those with 24% dietary protein. Fish fed feed
with higher dietary protein level exhibited lower feeding coefficients vs those fed 24%
protein (by 13.04%). The lettuce biomass and the length of their root system by the
end of the trial were higher in the experimental variant with 28% crude protein.
Keywords :
Carp, Lettuce, Recirculating System, Biomass, Raft system