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Semipurified Diets (semipurified + diet)

Distribution by Scientific Domains

Earth and Environmental Science	100%

Selected Abstracts

Optimal protein level in a semipurified diet for juvenile greenlip abalone Haliotis laevigata

AQUACULTURE NUTRITION, Issue 4 2000
T.A. Coote
To optimize dietary protein level in relation to growth, semipurified diets with an essential amino acid profile similar to that of the soft body profile were fed for 59 days to young greenlip abalone, Haliotis laevigata (initial shell length, 15,25 mm). Animals were housed in 10-L acrylic tanks, with flow-through seawater supplied at 1 L min,1 (20 °C, salinity= 36 g L,1). Protein level of feeds ranged from 122 g kg,1 to 461 g kg,1 crude protein (CP) on an ,as is' basis. Second-order polynomial regression analysis of specific growth rate indicated that maximal growth occurs at 270 g kg,1 CP. The protein and energy components of the feed were estimated to have a digestibility of 71.7% and 55.6%, respectively. [source]

Dietary vitamin A requirement of juvenile Amur sturgeon (Acipenser schrenckii)

JOURNAL OF APPLIED ICHTHYOLOGY, Issue 5 2008
H. Wen
Summary The present experiment was conducted to determine the dietary vitamin A requirement of juvenile Amur sturgeon (Acipenser schrenckii) by formulating seven semipurified diets containing 10, 258, 510, 1050, 2020, 4100 and 8300 IU vitamin A (as retinol acetate) kg,1 diet, respectively. Each experimental diet was fed to triplicate groups of 20 juveniles each with initial average weights of 12.09 ± 0.22 g in 405-L aquaria and maintained at 25.0 ± 2.0°C for 8 weeks. Fish fed the basal diet (10 IU vitamin A kg,1 diet) exhibited poor appetite and activity, whereas these signs were not observed in any group fed vitamin A-supplemented diets. Weight gain, feed efficiency and hepatosomatic index increased significantly with increases in the dietary vitamin A level, reaching a peak with the vitamin A 1050 IU kg,1 diet, and then decreasing. Muscle chemical compositions were not affected by the dietary vitamin A levels. Vitamin A concentrations in liver and muscle increased significantly as the vitamin A levels increased within a range of 10,4100 IU kg,1 diet; above this level there were no significant changes. Broken-line regression analysis of weight gain and liver vitamin A concentration against the dietary vitamin A level showed that juvenile Amur sturgeon required a minimum of 923 IU vitamin A kg,1 in the diet for maximal growth, and 1981 IU kg,1 for highest liver vitamin A accumulation. [source]

Growth and hepatopancreas performances of gibel carp fed diets containing low levels of aflatoxin B1

AQUACULTURE NUTRITION, Issue 4 2010
D. HAN
Abstract The effects of aflatoxin B1 (AFB1) on growth, physiological responses and histological changes were investigated in juvenile gibel carp (Carassius auratus gibelio). Triplicate groups of gibel carp (3.53 ± 0.02 g) were fed seven semipurified diets (Diet 1 to 7) containing 3.20, 5.37, 7.08, 9.55, 12.70, 17.90 and 28.60 ,g AFB1 kg,1 diet for 3 months. The results showed fish weight gain fed Diet 6 was 112.6% of that of control group (Diet 1) after 3 months, but there was no significant difference of weight gain between fish fed Diet 7 and the control group. Alanine aminotransferase (ALT) of fish hepatopancreas fed Diet 7 was significantly higher than the control group (P < 0.05), but no significant difference was observed in ALT activities of the fish fed with more than 10 ,g AFB1 kg,1 (Diet 4, 5, 6 and 7). No significant histological lesions were identified between the control and increasing AFB1 treatments. AFB1 accumulated in hepatopancreas was logarithmically related to the dietary AFB1 levels, and AFB1 also accumulated in muscles and ovaries of gibel carp fed Diet 3 to Diet 7. The present results indicated that fish fed with more than 10 ,g AFB1 kg,1 diet showed impaired physiological responses and more AFB1 residue of muscles and ovaries above the safety limitation of European Union. [source]

Comparison of different types and levels of commercial soybean lecithin supplemented in semipurified diets for juvenile Litopenaeus vannamei Boone

AQUACULTURE NUTRITION, Issue 1 2001
H. Gong
Two 6-week growth trials were conducted to determine the dietary phospholipids (PL) requirement of Litopenaeus vannamei juveniles and to compare the effect of different types of soybean lecithin on shrimp growth and survival. In the first trial, a basal diet and diets containing 1.5, 3 or 5% (dry-weight basis) of Type I lecithin (97.6% PL) and 1.5 or 3% of Type II lecithin (71.4% PL) were evaluated. In the second trial, the basal diet and diets containing 1, 2 or 4% of either Type I or Type II lecithin and 1 or 2% of Type III lecithin (48.4% PL) were evaluated. Results showed that there was no interaction between lecithin type and PL level on shrimp growth or survival. Shrimp growth increased with PL levels up to 3,5% of diet. No significant differences were observed for instantaneous growth rate (IGR) of shrimp fed the different types of lecithin at the same inclusion level, and no effect of PL level and lecithin type on shrimp survival was found. Thus, the recommended level of PL supplementation in diets for L. vannamei juveniles ranges from 3 to 5% of diet. [source]

Phosphorus requirements of gilthead sea bream (Sparus aurata L.) juveniles

AQUACULTURE RESEARCH, Issue 2001
A M Pimentel-Rodrigues
Abstract A trial was conducted to evaluate the phosphorus requirements of gilthead sea bream juveniles. Seven semipurified diets were formulated to contain 54% crude protein and 15% lipids and phosphorus (di-calcium phosphate) levels ranging from 0.37% to 1.5% (DM basis). Each diet was fed to duplicate groups of 25 fish with an initial average weight of 5 g over 42 days. The fish were fed by hand to visual apparent satiety twice daily, six days a week. At the end of the trial growth rate was not significantly different in groups fed diets containing 0.75% phosphorus or higher, while growth rate of fish fed the 0.37% phosphorus diet was significantly lower than all the other diets. Feed efficiency ratio, protein efficiency ratio and N retention were significantly lower in fish fed the 0.37% phosphorus diet than in those fed diets with 0.75% and higher phosphorus levels. Phosphorus content of the fish averaged 2% (on a dry weight basis) and was not significantly affected by dietary phosphorus content. Phosphorus retention averaged 6.6 g kg,1 weight gain and was not statistically different among groups. Phosphorus retention (% phosphorus intake) decreased with the increase of dietary phosphorus content, being even higher than 100% in groups fed diets with 0.37% and 0.57% phosphorus, indicating phosphorus absorption from the water. The results of this study indicate that phosphorus requirements of gilthead sea bream juveniles were satisfied with a diet including 0.75% phosphorus. [source]