Effects of replacing fish meal with soya protein concentrate on growth, feed efficiency and digestibility in diets for snakehead, Channa striata

Abstract

Soya bean meal-based formulated feeds have recently become available for snakehead culture in Vietnam. This study was conducted to determine the appropriate replacement of fish meal (FM) protein by another soya product, soya protein concentrate (SPC), in snakehead (Channa striata) diets. Five iso-nitrogenous (45% crude protein) and isocaloric (19 KJ g À1 ) practical diets were formulated to replace 0% (control), 40%, 60%, 80% and 100% of protein FM by protein SPC (100% FM, 40% SPC, 60% SPC, 80% SPC and 100% SPC respectively). A digestibility experiment was also conducted with the same formulated diets with addition of 1% chromic oxide. Fish fed 100% FM and 40% SPC diets had significantly better growth and survival compared with other treatments. Feed intake, feed conversion ratio, protein efficiency ratio and net protein utilization, trypsin and chymotrypsin activities of experimental fish fed 100% FM and 40% SPC diets were significantly higher than those fed other diets. The apparent digestibility coefficient (ADC) of the diet and diet components, ADC diet , ADC protein and ADC lipid , of fish fed diet 40% SPC and 100% FM treatment were significantly higher than those of other treatments. The cost/kg fish produced in diets 100% FM and 40% SPC was much lower compared with other treatments. Dietary inclusion levels of SPC in diet above 40% significantly affected fish survival, growth, digestibility and trypsin and chymotrypsin activities, although fish chemical composition was not greatly affected.

Effect of different dietary lipid sources on growth performance and nutrient utilization of + Nile tilapia ( Oreochromis niloticus ) fingerlings

“…In 2014, the contribution of the sector rose to 73.8 million tonnes, with China accounting for about 60% of global fish production [3]. However, the sector relies heavily on increasingly expensive and scarce fish meal and fish oil [4]. The success of any commercial aquaculture requires the provision of a balance mix of feed containing nutrients in the right proportion [5].…”

Influence of dietary fatty acid composition on enzymatic activity and digestive histology in silver catfish (Rhamdia quelen)

“…The development of the digestive system occurred in the same way in the 15FM and 30SPC diet animals. Slower development was observed in smaller animals due to the lower digestibility of SPC in relation to fish meal (FM) confirmed in studies carried out by Hien et al (2017). According to Drew et al (2007) the protein quality of the ingredient depends fundamentally on its digestibility.…”

Essential amino acids supplementation to practical diets affects growth, feed utilization and glucose metabolism‐related signalling molecules of blunt snout bream ( Megalobrama amblycephala )

“…These finding are consistent with those obtained by Cai et al (), Zhou, Habte‐Tsion, Ge, Liu, et al (); (Zhou, Habte‐Tsion, Ge, Xie, et al, ) in the target species; by Ren et al () in gibel carp ( Carassius auratus gibelio ), and by Cabral et al () in Senegalese sole ( S. senegalensis ). In contrast, Hien et al () reported that the replacement of fishmeal by soy protein concentrate in the diet of snakehead ( Channa striata ) affected whole body moisture, lipid, and ash.…”