Nutritional evaluation of waste date fruit as partial substitute for soybean meal in practical diets of juvenile Nile tilapia,Oreochromis niloticusL.

Abstract

The potential of waste date meal (WDM; low‐quality date palm, Phoenix dactylifera L.) as a carbohydrate source in formulated diets for Nile tilapia was evaluated. Four isocaloric‐practical diets (15.7 kJ g−1) were formulated incorporating WDM at 0, 100, 200 and 300 g kg−1 levels as partial substitutes for soybean meal (SBM). These were designated D0 [284 g crude protein (CP) and 383 g carbohydrate (CHO) kg−1 diet], D1 (279 g CP and 446 g CHO kg−1 diet), D2 (207 g CP and 495 g CHO kg−1 diet) and D3 (175 g CP and 578 g CHO kg−1 diet). Each diet was fed to three replicate groups of 30 fish [20.20 ± 0.09 g (±SE)] for 75 days. No feed‐related mortality was observed during the entire experimental period. Final body weight (FBW) and specific growth rate (SGR) in the different treatments were statistically not significantly different (P > 0.05). Protein efficiency rate (PER) was lowest in diet D0 and increased with decrease of SBM content (D1–D3). A significant increase in whole body lipid content was recorded in fish fed diets D2 and D3. Results showed that WDM could be a substitute for SBM up to 300 g kg−1 in practical Nile tilapia diets without compromising growth.

The effect of mango waste meal in the protein:carbohydrate ratio on performance and body composition of pacamã fish (Lophiosilurus alexandri)

“…The elevated survival rates indicate that the diets containing mango meal as a carbohydrate source did not have a harmful effect on the health of fish. The survival rate in this study was 100%, corroborating the studies of Azaza et al (2008), who observed significant difference in the survival rate of animals fed increasing levels of date meal in contrast to decreasing soybean levels in diets for tilapia. These values show that the efficiency of mango waste meal as a carbohydrate source in diets depends on the species and its eating habits.…”

The effects of rearing density on growth, size heterogeneity and inter-individual variation of feed intake in monosex male Nile tilapia Oreochromis niloticus L.

“…Each tank was part of an open circulated system previously described by Azaza et al (2009a and2009b). The tanks were supplied with water coming from the geothermal source after undergoing cooling in a large tank of storage located at the upstream of the experimental system.…”

Effect of partial replacement of dried, wet cull dates and date pits instead of yellow corn, supplemented with feed additives on growth performances of Nile tilapia (Oreochromis niloticus).

“…On the other hand, availability of quality fish feed ingredients constitutes a great challenge for fish nutritionists (Sotolu, 2010;Sotulo et al, 2011). Several studies have been investigated the potential using of date pits (Yousif et al, 1996;Osman et al, 2001;El-Sayed et al, 2006), cull dates (Srour et al, 2002;Nour et al, 2004;Azaza et al, 2008, byproducts (Sotolu and Faturoti, 2009), and feed additives (Mabrouk et al, 2008(Mabrouk et al, , 2011a in fish feeds. In addition, many of fish producers cannot afford to supplement fish diets with the highly expensive feed additives (Oladotun et al, 2003); therefore, the use of organic-based feed additives to improve feed utilization efficiency in aquaculture.…”