Protein requirement for maintenance and maximum growth of two-banded seabream (Diplodus vulgaris) juveniles

Abstract

The effects of various dietary protein levels on growth performance, whole body composition and nutrient utilization were studied in two-banded sea bream (Diplodus vulgaris), a candidate species for aquaculture. Fish (initial weight 6.1 g) were fed to satiety six iso-energetic diets, containing 5%, 12.5%, 25%, 35%, 45% or 55% of crude protein during 72 days. Fish fed 35% and 45% protein attained better growth and feed utilization than the other groups (P < 0.05). Daily growth index and feed conversion ratio were the poorest for fish fed 5% and 12.5% protein (P < 0.001), while the 25% and 55% protein groups had intermediate performance. Lipid retention increased significantly from 13.7% to 30.1% (P < 0.0001) and protein retention decreased from 35.5% to 21.3% (P < 0.01) with increasing protein levels from 12.5% to 45%. Muscle protein, lipid and energy concentrations were not significantly affected by dietary protein level. The estimated protein requirement for maintenance and maximum growth of two-banded seabream growing from 6 to 20 g were 7.5% and 35.7%, respectively. Protein requirements as calculated from body protein gain were 2.3 and 6.5 g of protein intake per kilogram body weight per day. KEY WORDS

Dietary protein requirement in common snook (Centropomus undecimalis ) juveniles reared in marine and brackish water

“…in dietary protein levels produces an increase in average weight and nal length, FCF, AWG, DWG, and K until reaching maximum values with the 50% protein diet, with a direct correlation between growth and the amount of protein in the diet, which has been reported for various sh species (Santigosa et al 2011a, Prasad 2014, while an excess of proteins in the diet can stimulate increased trypsin production, which increases both satiety and energy costs used for ammonia excretion. Therefore, an increase in protein catabolism reduces the use of other nutrients (carbohydrates and lipids) as an energy source, due to deamination, which causes greater feed intake and low protein utilization (Morgane and www.ujat.mx/era Fountoulaki 2014), while a greater release of amino acids causes a greater concentration of ammonia in the plasma, which can be toxic (Ozório et al 2009), and reduces growth (Mohseni et al 2013) and PER, as has been seen in the leopard coral grouper (Plectropomus leopardus, Lacepede, 1802) and the Yellow cat sh (Horabargus brachysoma, Günther, 1864) (Prasad 2014, Xia et al 2015. In this same aspect, the high PER values in diets with low protein percentages are usually due to the u-pregulation of amino acid transport as a response to the compensation for a nutritional de cit in the diet (Santigosa et al 2011a, b).…”

Evaluation of Protein Levels in Diets for Salema Porgy (&lt;i&gt;Sarpa salpa&lt;/i&gt;) Juveniles, a New Candidate Species for the Mediterranean Aquaculture

“…Similar to the findings in the present study for salema porgy, Sá et al [21] and Coutinho [22] also reported other sparid candidates such as white seabream (Diplodus sargus) (0.89%/day) and zebra seabream (Diplodus cervinus) (0.8%/day) as slow growing marine species, respectively. On the other hand, higher SGRs of 1.22%/day [23] and 1.54%/day [24] were recorded for two-banded seabream (Diplodus vulgaris) and sharpsnout seabream (Diplodus puntazzo), respectively.…”

PENGARUH KADAR TRIPTOPAN PAKAN TERHADAP PERTUMBUHAN DAN SINTASAN KRABLET KEPITING BAKAU, Scylla serrata SELAMA MASA PENDEDERAN

“…Tingkat konsumsi pakan harian (KPH) dihitung berdasarkan formula (Ozorio et al, 2009): Rasio konversi pakan (FCR) (Unnikrishnan & Paulraj, 2010):…”