Abstract:The present work aimed to assess the partial replacement of artificial diets by wet bioflocs biomass in the culture of Nile tilapia juveniles. Fish were fed on different combinations of commercial dry diets (CD) and wet bioflocs biomass (BF), as it follows: 75% CD + 25% BF, 50% CD + 50% BF, and 25% CD + 75% BF, dry matter basis. There were also positive control tanks in which the fish received only commercial diet (100% CD), and three negative control tanks where the reductions of dry diets were not compensate… Show more
“…As the feeding allowances were higher in tanks with 2% DL-methionine supplementation, the P excretion to water was proportionally higher in those tanks. Similar results were reported by Caldini et al (18) , who attributed the higher concentrations of reactive phosphorus to the greater allowances of commercial diets.…”
Section: Water Qualitysupporting
confidence: 90%
“…Fish in the negative control group received only 75% dietary allowance of the positive group and no methionine supplementation. Fish in three experimental groups received 75% daily dietary allowance (18) , but their commercial diet was supplemented with increasing levels of DL-methionine (0.5; 1.0 and 2.0%). The DL-methionine was blended to the amounts of artificial diet offered in each tank as follows: the designed amounts of DL-methionine (0.5%; 1.0% 2.0%) were manually mixed with the artificial diet with the aid of a glass rod; the daily amounts of diet supplemented with DL-methionine were weighed and stored in plastic bags until use.…”
The present study aimed at determining the effects of dietary DL-methionine supplementation on the water quality, bioflocs composition and Nile tilapia juvenile’s (initial body weight = 2.76 ± 0.06 g) growth performance in BFT rearing tanks (18 fish/100-L tank). Fish were or not subjected to artificial feed restriction. The experimental treatments consisted of two control groups: 1 - no feed restriction, no methionine supplementation; 2 - feed restriction at 25%, no methionine supplementation. There were also four treated groups: 1 - feed restriction at 25%, dietary DL-methionine supplementation at 0.5%; 2 - feed restriction at 25%, dietary DL-methionine supplementation at 1.0%; 3 - feed restriction at 25%, dietary DL-methionine supplementation at 2.0%; 4 - feed restriction at 25%, DL-methionine supplementation of molasses at 1.0. Supplementation of the commercial diet with DL-methionine has not affected either the water quality of the BFT Nile tilapia rearing tanks or the proximate composition of the bioflocs. After 8 weeks, weight gain of fish reared in tanks with feed restriction and dietary DL-methionine supplementation at 1% or 2% has not differed (P>0.05) from the tanks without feed restriction. In conclusion, it is possible to restrict the daily feed allowances of Nile tilapia juveniles reared in BFT tanks at 25%, with no growth performance impairment, if a minimal dietary DL-methionine supplementation of 1.0% is given.
“…As the feeding allowances were higher in tanks with 2% DL-methionine supplementation, the P excretion to water was proportionally higher in those tanks. Similar results were reported by Caldini et al (18) , who attributed the higher concentrations of reactive phosphorus to the greater allowances of commercial diets.…”
Section: Water Qualitysupporting
confidence: 90%
“…Fish in the negative control group received only 75% dietary allowance of the positive group and no methionine supplementation. Fish in three experimental groups received 75% daily dietary allowance (18) , but their commercial diet was supplemented with increasing levels of DL-methionine (0.5; 1.0 and 2.0%). The DL-methionine was blended to the amounts of artificial diet offered in each tank as follows: the designed amounts of DL-methionine (0.5%; 1.0% 2.0%) were manually mixed with the artificial diet with the aid of a glass rod; the daily amounts of diet supplemented with DL-methionine were weighed and stored in plastic bags until use.…”
The present study aimed at determining the effects of dietary DL-methionine supplementation on the water quality, bioflocs composition and Nile tilapia juvenile’s (initial body weight = 2.76 ± 0.06 g) growth performance in BFT rearing tanks (18 fish/100-L tank). Fish were or not subjected to artificial feed restriction. The experimental treatments consisted of two control groups: 1 - no feed restriction, no methionine supplementation; 2 - feed restriction at 25%, no methionine supplementation. There were also four treated groups: 1 - feed restriction at 25%, dietary DL-methionine supplementation at 0.5%; 2 - feed restriction at 25%, dietary DL-methionine supplementation at 1.0%; 3 - feed restriction at 25%, dietary DL-methionine supplementation at 2.0%; 4 - feed restriction at 25%, DL-methionine supplementation of molasses at 1.0. Supplementation of the commercial diet with DL-methionine has not affected either the water quality of the BFT Nile tilapia rearing tanks or the proximate composition of the bioflocs. After 8 weeks, weight gain of fish reared in tanks with feed restriction and dietary DL-methionine supplementation at 1% or 2% has not differed (P>0.05) from the tanks without feed restriction. In conclusion, it is possible to restrict the daily feed allowances of Nile tilapia juveniles reared in BFT tanks at 25%, with no growth performance impairment, if a minimal dietary DL-methionine supplementation of 1.0% is given.
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