Effect of Dietary Protein Concentration and Feeding Rate on Weight Gain, Feed Efficiency, and Body Composition of Pond-Raised Channel Catfish Ictalurus punctatus

1999 ◽  
Vol 30 (3) ◽  
pp. 311-318 ◽  
Author(s):  
Edwin H. Robinson ◽  
Meng H. Li
Keyword(s):  
Body Composition ◽  
Weight Gain ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Dietary Protein ◽  
Feed Efficiency ◽  
Protein Concentration ◽  
Feeding Rate

Dietary tyrosine supplementation enhances weight gain in streptozotocin-diabetic rats

1984 ◽  
Vol 62 (7) ◽  
pp. 781-786 ◽  
Author(s):  
N. Theresa Glanville ◽  
G. Harvey Anderson
Keyword(s):  
Weight Gain ◽  
Dietary Protein ◽  
Feed Efficiency ◽  
Protein Concentration ◽  
Proximate Analysis ◽  
Diabetic Rats ◽  
Specific Increase ◽  
Streptozotocin Diabetic Rats ◽  
Similar Body ◽  
Protein Diets

The effect of dietary protein concentration and tyrosine supplementation on growth in streptozotocin (65 mg/kg, ip) diabetic rats was evaluated. When rats were fed diets ranging from 15 to 60% protein, weight gain and feed efficiency were greatest in rats fed the 45% protein diet. Adding tyrosine to this diet (8%, incorporated as a percentage of protein) did not promote further weight gain relative to nonsupplemented diabetic animals. In contrast, rats choosing 45% of total calories as protein by selecting from 10 and 60% protein diets supplemented with either 0, 4, or 8% tyrosine demonstrated a 35% (4% tyrosine) to 45% (8% tyrosine) increase in weight gain. Proximate analysis indicated similar body composition in tyrosine supplemented and nonsupplemented diabetic animals. Including tryptophan (1.45%) with tyrosine in the self-selection diet was without effect. Thus, tyrosine supplementation promoted a modest but consistent and specific increase in weight gained by self-selecting diabetic rats.

Water Quality and Growth Simulation of Channel Catfish, Ictalurus Punctatus, in a Recirculating Aquaculture System Combined with Subsurface Flow Wetland

2011 ◽  
Vol 343-344 ◽  
pp. 1109-1116
Author(s):  
Tao Yu ◽  
Fei Zhong ◽  
Dong Xu ◽  
Qiao Hong Zhou ◽  
Wei Liang ◽  
...  
Keyword(s):  
Weight Gain ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Feed Efficiency ◽  
Oxygen Demand ◽  
Stocking Density ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Total Weight Gain

Purifying efficiency and culture performance in a recirculating aquaculture system (RAS) combined with subsurface flow wetland (SFW) were investigated in this paper. The results showed that the wetland effectively removed total suspended solids (78.6%), chemical oxygen demand (49.2%), 5-day biochemical oxygen demand (70.4%), total ammonia (53.7%) and nitrite (64.7%) from the aquaculture effluents at a hydraulic loading rate of 344 mm/d. The channel catfish (Ictalurus punctatus) with initial length of 18.97±2.92 cm were reared for 223 days in three recycling ponds at different stocking densities (0.055, 0.109, and 0.164 kg/m3) and a control pond at stocking density 0.055 kg/m3. Fish were fed to satiation twice daily with a commercial diet and the amount fed was measured to determine feed efficiency (FE). In the recycling ponds, fish growth appeared to be negatively correlated with stocking density, in which total weight gain of fish ranged from 374.9% to 886.7%. Fish in the control pond had low survival rate (61.1%) and total weight gain (465.2%), comparing with the recycling pond which had same stocking density (0.055 kg/m3). Feed efficiency (0.34) of the control pond was also significantly lower than that of the 0.055 kg/m3 treatment (0.96). A logistic model of was employed to simulate the growth of channel catfish. The estimated parameters and predicted results showed that the growth rate of channel catfish reared in recycling pond is significantly higher than that in static pond.

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