The effect of Daphnia pulex enriched with various dietary rations on the growth and survival rates of Swordtail fish (Xiphophorus helleri) and Guppy (Poecilia reticulata) larvae

In this study, specific weight and length growth and survival rates of Swordtail fish (Xiphophorus helleri) and Guppy (Poecilia reticulata) larvae using three feeding treatments including Daphnia pulex+O. africanum, D. pulex+O. africanum+Canola oil and D. pulex+Oscillatoria africanum+Fish oil were investigated. The results showed that the mean (±SE) specific growth rate of Guppy fish larvae were 6.11±0.9, 5.84±1.4 and 5.6±1.2 g and for Swordtail fish larvae were 2.3±0.4, 4.14±1.7 and 4.5±0.8 g, respectively. Also, the specific length growth rates of Guppy fish larvae were 1.2±0.35, 1.4±0.25 and 1.1±0.3 cm and for Swordtail fish larvae were 1.8±0.3, 2.4±0.45 and 2.6±0.6 cm, respectively. The survival rate (%) of Swordtail fish larvae were 35.33, 41.11 and 46.62% while for Guppy fish larvae were 46.12, 81.41 and 94.63%, respectively.