جستجوی مقالات مرتبط با کلیدواژه « پودر ماهی » در نشریات گروه « شیلات »

The aim of this study was to evaluate fish meal replacement by a bacterial single cell protein (IPL68) on growth performance, digestive enzymes activity (protease, lipase and α-amylase), gut histology and gut microbiota in rainbow trout fry (initial weight = 2.51 ± 0.55 g) for 6 weeks. Five diets were formulated with different bacterial SCP level (0:D1, 25:D2, 50: D3, 75:D4 and 100: D5 %) to replace fishmeal protein. At the end of the trial, body weight gain, specific growth rate, condition factor and hepatosomatic index showed the higher values than other diets with a significant differences (P<0.05). The food conversion ratio had the lowest and highest values in D3 and D5 diets, respectively, with a significant difference (P<0.05). The survival rate in all experimental diets was 100%. The highest activity of protease, lipase and α-amylase enzymes was observed in the intestines of fish fed with D3 diet, which showed a significant difference compared to D4 and D5 diets (P<0.05). The highest number of total bacteria and lactic acid bacteria was observed in diet D3, which was significantly different from other diets (P<0.05). The highest villus height (µm) and the ratio of villus height to crypt depth was observed in fish fed with D3 diet, which was not significantly different from D1, D2 and D4 diets, but showed a significant difference with D5 diet (P<0.05). Based on the obtained results, D3 diet can be suitable for the growth of rainbow trout fry compared to other diets.

A study carried out for reduction of fish meal in Beluga Huso huso diet. A basic diet based on 54% fish meal were formulated. A mixture based on corn gluten wheat and anchovy fish meal formulated similar to amino acid profile of basic diet at the levels of 20, 40, 60 and 80% as experimental treatments, fish meal (FM) (Basal diet) and corn gluten meal base included 20% replacement (CGM20), 40% replacement (CGM40), 60% replacement (CGM60) and 80% replacement (CGM80) with Similar protein (44%), energy (18 MJ / kg) and amino acid profiles. Beluga fish (Huso huso) with average weight of 167.6± 6.5g introduced in each experimental unit and were fed on experimental diets during a 10 –week culture period. Effect of these alternatives on growth indicators and liver tissue were investigated. Alternative food had no effect on fish growth indices and there was no significant difference in fish performance growth (P>0.05). No significant difference was observed in hepatosomatic index (P>0.05). Liver tissue was normal in fish fed FM, CGM20, CGM40, CGM60 and a low damage observed in liver tissue such as cell necrosis, nuclear hypertrophy and hemorrhage. But, fish liver tissue fed by CGM80 had higher abnormal liver damages such as lipid degeneration, cell necrosis, biliary stagnation and hemorrhage.

The present study was conducted to evaluate the effect of fish meal replacement with yellow meal worm (Tenebrio molitor) (TM) on growth performance and proteolytic enzymes activity of trypsin and alkaline protease in koi (Cyprinus rubrofuscus) juvenile (weight: 0.95 ± 0.15 g) for 8 weeks. Five experimental diets were prepared with replacement levels of 0 (control), with 25% (D1), 50% (D2), 75% (D3) and 100% (D4) of fish meal with TM as isonitrogenous and isoenergetic in triplicate. Parameters of body weight gain, specific growth rate and condition factor in control, D1 and D2 diets were not shown a significant difference, while these indices had a decreased amount in D3 and D4 diets significantly (p < 0.05). The highest amount of feed conversion ratio was indicated in control and D1 diets with a significant difference than those from other treatments (p < 0.05). The survival rate was 100 % in the diets. The lipid efficiency ratio and the protein efficiency ratio in diets control, D1 and D2 were significantly the higher than other treatments (p < 0.05). The highest activity of trypsin and alkaline protease enzymes from intestine was observed in control, D1 and D2 groups which showed a significant difference compared to D3 and D4 groups (p < 0.05). The findings of growth performance and protease enzymes activity were revealed that the diets containing up to 50% TM could be appropriate for koi growth.

This study was conducted to evaluate the effect of fish meal replacement by Aqupro (processed soybean meal) on growth performance and body composition of juvenile Siberian sturgeon (Acipenser baerii). One hundred and five juveniles Siberian sturgeon (initial body weight 171.79±1.07 g; mean±SE) were distributed in five treatments each with three replictions. The experimintal diets, including different levels of Aqupro (20, 40, 60 and 80 percent) replaced with fish meal. During the 90 days feeding period, the fish were fed with the experimental diets to apparent satiation four times daily (9:00, 13:00, 17:00, 21:00). At the end of rearing period, growth performance and fish body composition were measured. The results showed there were no significant differencs in growth performance including final weight, weight gain, feed conversion ratio, body weight increase, final length, condition factor, specific growth ratio, protein efficiency ratio, lipid efficiency ratio and survival rate with the control group (p >0.05). There were no significant differences in crude protein, crude fat, moisture and ash contents of the whole body among the groups (p >0.05). According to the results, due to the importance of fish meal and its high price, nutritional value of Aqupro and easy accessibility, best growth performance and no negative impact on mentioned parameters in AP60 and AP80 treatments, using of Aqupro up to 60% recommended in the Siberian sturgeon diet.