:: Volume 2, Issue 1 (4-2015) ::
3 2015, 2(1): 1-9 Back to browse issues page
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
A Farahi , M Sudagar
Abstract:   (2690 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. 

Keywords: Prebiotic, Immunogen, Reproductive performance, Angelfish (Pterophyllum scalare).
Full-Text [PDF 695 kb]   (697 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/11/9 | Accepted: 2015/11/9 | Published: 2015/11/9

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