Effect of enriched Artemia parthenogenetica nauplii with Probiotic (Bacillus spp) On Feeding Parameters and Stress Resistance in Rainbow Trout (Oncorhynchus mykiss) larvae

Jamali, Hadi; Jafaryan, Hojatollah; Patimar, Rahman; Soltani, Mehdi

Effect of enriched Artemia parthenogenetica nauplii with Probiotic (Bacillus spp) On Feeding Parameters and Stress Resistance in Rainbow Trout (Oncorhynchus mykiss) larvae

Authors

Hadi Jamali ¹

Hojatollah Jafaryan ¹

Rahman Patimar ¹

Mehdi Soltani ²

¹ Department of Fishery, Gonbad University of Agriculture Sciences and Naturar Resources, Gonbad, Iran.

² Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran-Iran

Abstract

This study was carried out to evaluate the effect of Probiotic (Bacillus spp) on feeding parameters and survival in Rainbow Trout (Oncorhynchus mykiss) larvae (176 mg) during 30 days. Rainbow Trout larvae were fed on Artemia parthenogenetica nauplii enriched at suspension of five probiotic bacillus at doses of 1×10⁸, 2×10⁸ and 3×10⁸ )CFU/liter(. The feeding level was 30 percent of total biomass per day. The daily ration was divided into four feeding portions. Feeding parameters were influenced by Probiotic bacilli-enriched artemia (P<0.05). Feeding on enriched artemia caused a higher feed conversion efficiency and a better feed conversion ratio than those received control artemia (no enrichment, P<0.05). The highest feeding operation was observed in the treatment with dose of 2×10⁸ (CFU/L) in suspension of broth. Fish fed on Probiotic bacilli-enriched artemia showed a higher resistance to unwanted environmental factors (P<0.05). The current experiment indicated that the supplementation of Artemia parthenogenetica nauplii with probiotic bacillus can increase the feeding parameters and stress tolerance in Oncorhynchus mykiss larvae when facing with unfavorable environmental conditions.

Keywords

bacillus

Rainbow Trout

Enrichment

Artemia parthenogenetica

feeding