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Effect of protease enzyme in the diet on the growth performance and chemicals body composition of Sterlet (Acipenser ruthenus Linnaeus, 1758) juvenile
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Mansore Kakavand   , Seyed Pezhman Hosseini Shekarabi * , Mehdi Shamsaie Mehrgan , Houman Rajabi Islami |
| National Research Centre of Saline-waters Aquatics, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Bafq, Iran |
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Abstract: (642 Views) |
This 70-day experiment examined the effect of protease added to the commercial feed of Sterlet (Acipenser ruthenus) at concentrations of 0 (control group), 75 mg (T1 treatment), 150 mg (T2 treatment) and 300 mg (T3 treatment) per kg of diet on growth parameters and carcass composition. a number of 180 juvenile Sterlet with an average body weight of 6.02±0.34 g was randomly divided into 12 fibreglass tanks with stocking density of 15 fish per each tank. At the end of the experiment, growth parameters indicated a significant difference between experimental treatments compared to the control group (p<0.05). The highest final weight (66.45 ± 0.33 g), weight gain (59.44 ± 0.52 g), specific growth rate (1.39 ± 0.02 %/day), protein efficiency ratio (2.43±0.11) and the lowest food conversion ratio (0.84±0.04) were measured in T3 treatment. However, the highest amount of condition factor (2.34±0.08%) was recorded in the T2 treatment (p<0.05). The carcass composition showed a significant increase between all the investigated indices in the experimental treatments compared to the control group (p<0.05). The highest amounts of dry matter (26.54±0.06%) and crude protein (15.27±0.02%) were measured in the T3 treatment. The highest amount of crude fat (8.07±0.05%) was in the T1 treatment. The highest amount of ash (2.27±0.02%) was observed in the T2 treatment. Based on the obtained results, it can be concluded that protease in concentrations of 75 to 300 mg per kg positively affected the growth and chemical composition of carcass A. ruthenus.
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| Keywords: Protease, Growth performance, Carcass Composition, Sterlet Sturgeon. |
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Full-Text [PDF 317 kb]
(120 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2022/12/21 | Accepted: 2023/01/13 | Published: 2024/11/21
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