Digestibility of feed ingredients for the striped surubimPseudoplatystoma reticulatum

Abstract

Knowledge on apparent digestibility coefficients (ADC) is necessary to maximize the feed efficiency, thus lessening dietary nutrient and energy losses. This study tasks the determination of apparent digestibility of selected feedstuff to striped surubim Pseudoplatystoma reticulatum, a carnivorous, South American catfish of economic importance for fisheries and fish culture alike. Juvenile striped surubim (82.4 ± 17.7 g and 23.0 ± 1.6 cm) was distributed in 21 cylindrical, plastic cages (80 L), housed in seven 1000 L feeding tanks under constant water flow and aeration and conditioned to a two daily meals (20h00m and 22h00m) feeding regimen on a practical, reference diet (RD) (460.0 g kg À1 crude protein (CP); 19.23 kJ g À1 gross energy (GE)]. Test diets were obtained by adding of 1 g kg À1 chromium III oxide and 300 g kg À1 of one the following feedstuffs: fish meal (FM), meat and bone meal (MBM), poultry by-product meal, feather meal, blood meal, soybean meal, wheat bran, corn and corn gluten meal to the RD. After the last daily meal, fish were transferred to cylindrical, conical-bottomed aquaria (200 L) under aeration and continuous water exchange, coupled to refrigerated plastic bottles for faeces collection by sedimentation. Best ADC of protein (99.36%) and energy (86.25%) were recorded for poultry by-product meal and MBM, respectively, which are thus deemed ideal surrogate feedstuffs to FM in the formulation and processing of diets for striped surubim.

Apparent digestibility of wheat and coproducts in extruded diets for the Nile tilapia, Oreochromis niloticus

“…The ADCs of energy and nutrients in wheat coproducts have been determined for fish with different feeding habits, including some carnivorous species. For instance, compared to our results, Silva et al (2013) (NRC, 2011;RODRIGUES et al, 2012). The level of amylolytic and proteolytic activity in the digestive tract varies widely among fish with different feeding habits (HIDALGO et al, 1999).…”

Digestibility of animal and vegetable protein ingredients by pirarucu juveniles, Arapaima gigas

“…In studies with carnivorous fish, high protein digestibility values were observed for fish meal, as found for oscar (Astronotus ocellatus), 92.8% (Nascimento et al, 2012); dourado (Salminus brasiliensis), 94.3% (Borghesi et al, 2009); spotted sorubim (Pseudoplatystoma corruscans), 84.1% (Gonçalves and Carneiro, 2003); striped surubim (Pseudoplatystoma reticulatum), 82.8% (Silva et al, 2013); cobia (Rachycentron canadum), 96.3% (Zhou et al, 2004); and sea bass (Dicentrachus labrax), 93.5% (Davies et al, 2009).…”

“…However, Silva et al (2013) found worse digestibility for surubim (53.8%). In addition to the differences among the studied fish species, the lack of standardization for certain ingredients, such as the amount of ash, contributed to different values.…”

“…The composition of that ingredient was variable, and meals with large bone amounts tended to present lower ADCDM (Silva et al, 2013). The meat and bone meal had 38% mineral matter, which demonstrated a high amount of bone in its composition.…”

“…They may present excess minerals in their composition, generally due to the high presence of scales and bones, which results in reduced protein contents and nutritional values (Sampaio et al, 2001). Silva et al (2013), in a study with P. reticulatum, observed a similar ADCCP for meat and bone meal (87.4%), a higher ADCCP for poultry by-product meal (99.4%), and a lower ADCCP for soybean meal. Lee (2002) observed similar ADCCP values for meat and bone meal (90.0%) and soybean meal (84.0%) for Sebastes schlegeli.…”