Showing 8 results for falahatkar
Seyed Mehdi Soleimani, Mir Masud Sajjadi, Bahram Falahatkar, Mohammad Ali Yazdani,
Volume 5, Issue 3 (Winter 2016)
Abstract
A 12-week feeding trial was carried out to assess the effect of fish meal replacement by earthworm meal (Eiseniafoetida) on growth performance, feed efficiency and carcass composition of Siberian sturgeon (Acipenserbaerii). Fish with mean weight 21.32 ± 1.91 (mean ± SD) were fed with five experimental diets which 0% (Control), 10% (EWM10), 20% (EWM20), 30% (EWM30) and 40% (EWM40) of fish meal protein was replaced by earthworm meal protein. At the end of the feeding trial final body weight, weight gain, condition factor, feed coefficient ratio (FCR) and specific growth rate (SGR) were monitored. Fish fed EWM10 and EWM20 had highest weight gain and final weight respectively but no significant differences were observed between different treatments (P>0.05). Fish fed EWM40 had lowest final weight and weight gain and significant differences were observed between this treatment and EWM10 and EWM20 (P<0.05). The whole carcass protein and ash content were not influenced by earthworm meal replacement and significant differences were not observed between different treatments (P>0.05). Fish fed EWM30 showed lowest carcass lipid content that was significantly lower than control treatment (P< 0.05). This treatment also had highest moisture content and was significantly higher than control treatment (P<0.05). The results of the present study showed that inclusion of earthworm meal in diets can improve growth performance and feed efficiency. So 10 to 20% of fish meal can be replaced with earthworm meal without negative effects on growth performance of the Siberian sturgeon.
Ali Razgardani Sharahi, Bahram Falahatkar, Iraj Efatpanah,
Volume 6, Issue 1 (Summer 2016)
Abstract
This study aimed to determine the effects of replacement fish meal by different levels of gammarus meal on growth performance and body composition of juvenile Siberian sturgeon (Acipenser baerii). We distributed 245 Siberian sturgeon juveniles (initial body weight: 14.24±0.15 g) in five treatments and three replications. The experimental diets were replaced by 10%, 20%, 30%, and 40% gammarus meal. During the 9-week feeding period, the fish were fed with the experimental diets to apparent satiation four times daily. According to the results, there were no significant differences in the protein and fat efficiency ratios, visceral index and survival rate (P>0.05). The fish that received 10% and 20% treatments had a significantly greater mean final weight, weight gain, feed conversion ratio, body weight increase, final length, condition factor, specific growth rate, food intake and hepatosomatic index compared with the other treatments (P<0.05). There were no significant differences in whole body among the groups (P>0.05). The results of this study indicated that a diet with 20% gammarus meal could be used in Siberian sturgeon feed.
Mohammad Reza Kamalikia, Bahram Falahatkar, Iraj Efatpanah,
Volume 6, Issue 2 (Autumn 2016)
Abstract
This study aimed to determine the fat requirement and effect of dietary fat levels on growth and body composition indices of Bester (Huso huso ♀ × Acipenser ruthenus ♂) juveniles( 200.3 ± 2 g) in winter feeding. Fish were fed by 5 isonitrogenous diets (40% crude protein) with different fat levels including 10, 13, 16, 19 and 22%, 3 times daily according to the satiation for 50 days. The results showed that some growth indices such as final weight, body weight increase, specific growth rate, feed conversion ratio and protein efficiency ratio were significantly affected by different levels of dietary fat. Proximate analysis indicated that the fat, moisture and protein contents of the whole body were affected by the diets, body composition of fish fed the 22% fat diet showed significantly higher fat and lower moisture contents, as well as body composition of fish, fed 10% fat in the diet showed significantly higher moisture lower protein and lower fat. From the results, the present study suggests that more suitable dietary fat levels in winter feeding for the Bester growth might be around 13%.
Erfan Akbari Nargesi, Bahram Falahatkar, Hamed Abdollahpour,
Volume 6, Issue 4 (Spring 2017)
Abstract
Given the importance of Artemia as the most live feed used in the aquaculture industry, the interaction between light intensity and pH was investigated in two levels of light 1000 and 2000 lux, and three levels of pH 8, 9 and 10 on the percentage of hatching, percentage of umbrella stage and percentage of unhatched cyst on Artemia franciscana. To determine the percentage of hatching, percentage of umbrella stage and percentage of the unhatched cyst, samples were taken from each replicate after 48 hours of the beginning of the incubation. According to the results, there was no interaction between the two factors of light intensity and pH (P = 0.383). There was no significant difference between two light intensities (p = 0.305). However, the highest hatching rate was observed at 2000 lux light intensity. The difference was significant between three pH treatments in the percentage of hatching and percentage of the unhatched cyst (P < 0.001). So that, the highest and lowest hatching rates were observed at pH 9 (73.03 ± 6.98 %) and pH 10 (47.67 ± 2.58 %), respectively. In order, the highest and lowest of umbrella stage were observed at pH 8 (5.96 ± 0.87 %) and pH 9 (2.31 ± 0.58 %). Also, the highest and lowest of unhatched cyst were observed at pH 8 (33.05 ± 3.67 %) and pH 9 (24.65 ± 3.56 %), respectively. According to the results of the present study, it can be suggested that for achieve the maximum hatching rate of
Artemia franciscana cyst, it could be used water with a pH 9 and the light intensity 2000 lux
Erfan Akbari Nargesi, Bahram Falahatkar, Mirmasoud Sajjadi,
Volume 8, Issue 2 (Autumn 2018)
Abstract
Komeil Gholizadeh, Majidreza Khoshkholgh, Bahram Falahatkar,
Volume 8, Issue 4 (ُُSpring 2019)
Abstract
The aim of this study was to assess the effects of different doses of zero-valent iron nanoparticles in the diet of common carp fingerling on growth performance, proximate composition, and biochemical blood parameters. For this purpose, 150 fish with an average initial weight of 6.14 ± 0.10 g were fed on the experimental diets for 8 weeks. The diets contained 0, 50, 100, 150 and 200 mg/kg zero-valent iron nanoparticles. Based on the results, fish were fed the diet supplemented with 150 mg/kg zero-valent iron nanoparticles displayed significant difference in final weight, weight gain, final length, specific growth rate, body weight increase, average daily growth, feed efficiency, protein efficiency ratio and lipid efficiency ratio (P<0.05). The hepatosomatic index was the highest in the NI
0 treatment (P<0.05). Dietary nano-iron had no effects on proximate composition (moisture, ash, and protein) of common carp fed different diets (P>0.05), whereas the fat content of fish fed by 50 mg/kg zero-valent iron nanoparticles was significantly higher compared to other experimental diets (P<0.05). Fish fed by 150 mg/kg zero-valent iron nanoparticles showed significantly higher total protein, but the highest alkaline phosphatase activity in plasma was found in fish fed 50 mg/kg zero-valent iron nanoparticles (P<0.05). No significant differences were observed in glucose content among different groups (P>0.05). Based on the results, 150 mg/kg zero-valent iron nanoparticles in the diet has more influence than larger scales due to the increased surface to volume ratio and can be recommended in diet of common carp fingerlings.
Bahram Falahatkar, Iraj Efatpanah, Eshagh Rasouli Kargar,
Volume 10, Issue 3 (Winter 2020)
Abstract
Spawning and water temperature are important factors in the reproduction of valuable fishes such as Percids. In the present study, two types of artificial (turf) and natural (willow root) substrates were compared at two different temperatures of 11 and 12.6 °C in pikeperch (Sander lucioperca). The fish were introduced into the concrete tanks after hormone injection and one nest was installed for each breeding pair. After spawning, the nests were transferred to smaller ponds with controlled conditions for incubation. The eggs were hatched without dependence on the substrate, and there was no difference between incubation times. The results showed that the interaction between substrate type and the temperature was not significant. There was no significant difference in reproductive performance of fish by substrate type but at higher temperatures, more fish were spawned. At higher temperatures, most of the broodstock spawned during 3 to 4 days, and at lower temperatures spawned during 4 to 7 days. There was no difference in preference of fish over spawning on the specified substrate during the spawning time. The results of this study showed that spawning in a suitable temperature range and on artificial substrate had higher performance and the use of artificial substrate during semi-artificial reproduction of wild pikeperch is important for the restocking programs.
Mr. Mohammad Amini Vishekae, Dr. Majidreza Khoshkholgh, Dr. Bahram Falahatkar, Dr. Zabiollah Pazhand,
Volume 15, Issue 1 (Spring 2025)
Abstract
The use of prebiotics in aquaculture has been shown to enhance growth performance, improve immune function, and increase disease resistance by modulating the gut microbiota. This study aimed to investigate the effects of the prebiotic Prodi 450 (containing mannan oligosaccharides and beta-glucans) on the growth performance and total biomass of chironomid larvae, which were used as food for Siberian sturgeon (Acipenser baerii) fingerlings. The study was conducted in two phases: first, to assess the impact of different prebiotic levels on chironomid larvae, and second, to evaluate the subsequent effects on sturgeon growth. Four treatment groups were prepared, each with a different dosage of Prodi 450: control (0 mg), P250 (250 mg), P500 (500 mg), and P750 (750 mg) per kg of chicken manure. This manure was used as a substrate for rearing chironomid larvae, with three replicates per treatment. After 10 days of cultivation at 25.71 ± 0.79°C, the larvae were harvested. The larvae were then fed to Siberian sturgeon fingerlings (initial average weight of 1.14 ± 0.04 g) for 14 days to evaluate the effects on their growth performance and immune indicators. The results showed that the highest average larval weight was observed in the P250 treatment (8.50 ± 0.50 mg). The P500 treatment exhibited the second-best growth performance, which was not significantly different from P250 but significantly higher than the control and P750 treatments (p<0.05). There were no significant differences in total biomass per unit area among the treatments (p>0.05). For the Siberian sturgeon, there were no significant differences in growth indices (p>0.05), although the P500 treatment exhibited slightly higher growth in most indices. In conclusion, while the prebiotic supplementation did not significantly increase the total biomass of chironomid larvae per unit area, it did produce heavier larvae, particularly at the P250 and P500 levels. However, the prebiotic supplementation did not significantly affect the growth performance of Siberian sturgeon fingerlings over the 14-day feeding period.
