Effects of dietary inclusions of oilseed meals on physical characteristics and feed intake of diets for the Nile Tilapia, Oreochromis niloticus

Abstract

Please cite this article in press as: Obirikorang, K.A., et al., Effects of dietary inclusions of oilseed meals on physical characteristics and feed intake of diets for the Nile Tilapia, Oreochromis niloticus. Aquac. Rep. (2015), http://dx. a b s t r a c tThe present study investigated the effects of the inclusion of three oilseed by-products (soybean, copra and palm kernel meals) on some physical characteristics of pelletized feeds as well as on voluntary feed intake and faecal matter production by the Nile tilapia, Oreochromis niloticus. The dietary inclusion of soybean meal resulted in a significantly higher feed bulk density relative to the fishmeal control diet. The inclusions of copra and palm kernel meals, however, resulted in lower feed bulk densities. Sinking rates, water stabilities and nutrient retention efficiencies of feed pellets were directly related to feed bulk densities. The soybean meal diet had the fastest sinking velocities, greatest water stability and highest nutrient retention rates. The dietary inclusion of soybean meal, however, significantly impaired feed intake compared to the other three diets. Mean daily feed intakes of the control, palm kernel meal and copra meal diets corresponded to 28.88, 27.01 and 28.31 g during the experimental period and varied significantly from the mean daily intake of the soybean meal diet which corresponded to 20.01 g. Faecal matter production (g dry mass kg −1 ingested feed) was significantly higher in the tilapia groups fed the copra and palm kernel meals. The results obtained from this study show that 30% inclusions of unrefined forms of copra and palm kernel meal in Nile tilapia diets is possible, without adversely affecting feed intake or pellet nutrient losses prior to ingestion.

Polyunsaturated fatty acids and nutritional quality of five freshwater fish species cultivated in the western region of Santa Catarina, Brazil

“…In some cases the fatty acid profile of fish depends on a number of factors, with the dietary nutrients being the easiest one to manipulate (Cladis et al, 2014;Obirikorang et al, 2015). In order to control costs, diets with readily available fatty acids, such as palm and coconut oils, rich in SFA, canola and rapeseed oils, rich in MUFA, and sunflower, corn and soybean oils, rich in ω-6 PUFA oil, are often used in aquaculture (Teoh & Ng, 2016).…”

Inclusion of Fresh Raw Material on Tilapia Fry Diets Growth Under Aquaponics System

“…Various sources of plant and animal origin have been evaluated as a partial or complete substitutes of protein in Tilapia diets [14,24,1]. Previous studies have shown that a proper balance of protein in food ingredients may increase metabolic energy and thus improve fish growth [38,34,2], which in this study it was considered with different inclusion percentages by ingredient of plant or animal origin, and covering the nutritional requirements of the fry.…”

The effect of plant protein‐based diets on apparent nutrient digestibility, growth response, egesta quantity, postprandial ammonia excretion rate and serum quality of Nile tilapia

“…Feeding was carefully done to avoid feed wastage, and any uneaten pellets were removed 5 min after feeding. Faeces collection for faecal matter estimation followed the procedure described in Obirikorang, Amisah, Fialor, and Skov () commenced at the onset of the growth experiment and lasted for 6 days. During this period, faeces produced were allowed to settle in a sedimentation column beneath each tank submerged in ice flakes kept in a styrofoam box to ensure minimal microbial degradation of the collected faecal matter.…”

“…Faeces collection for faecal matter estimation followed the procedure described in Obirikorang, Amisah, Fialor, and Skov (2015b) faecal matter. Fish were fed twice daily at 9:00 a.m. and 4:00 p.m. at 3% of body weight.…”