Effects of different levels of dietary prebiotic Immunogen on reproductive performance of angelfish (Pterophyllum scalare) breeders and larval survival resulting in a sudden increase of temperature stress
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A Farahi * , M Sudagar |
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Abstract: (4951 Views) |
In this research, the effects of different levels of prebiotic Immunogen on reproductive performance of angelfish (Pterophyllum scalare) were investigated. 16 pairs of angelfish breeders with average weight 8.67±033 were fed till saturating for 50 days and after this period, reproductive indices such as absolute fecundity, hatching percent, larval survival until yolk-sac absorption, gonadosomatic index and larval tolerance against high temperature stress to amount 10 °C were evaluated. The experiment was carried out in completely randomize design with four levels 0 (control), 1% (T1), 1.5% (T2) and 2% (T3) that each treatment had 3 replications. Amount of absolute fecundity in T2 significantly was higher than control (p<0.05), but there were no significant differences among T1, T2, T3 and between control with T1, T3 (p>0.05). Gonadosomatic index in T2 and T3 was upper than control and T1 that this difference was significant (p<0.05). The highest hatching percent was observed in T2 (75±9.28) and T3 (66.95±8.85), respectively, so that significant differences (p<0.05) was seen among T2 with control and T1. In addition, there were no remarkable differences in larval survival until yolk-sac absorption and larval tolerance against thermal stress (p>0.05). Regarding to findings of this research, addition prebiotic Immunogen at level of 1.5% to angelfish breeders' diet was recommended for reproductive indices promotion. |
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Keywords: Prebiotic, Immunogen, Reproductive performance, Angelfish (Pterophyllum scalare). |
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Full-Text [PDF 695 kb]
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Type of Study: Research |
Subject:
Special Received: 2015/11/9 | Accepted: 2015/11/9 | Published: 2015/11/9
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