Effect of microalgal diets on filtration and ingestion rates of the rotifer Brachionus plicatilis
Abstract views: 275 / PDF downloads: 228
Effect of marine microalgal diet on filtration and ingestion rates of Brachionus plicatilis was studied. Marine microalgaeÂ viz., Nannochloropsis oculata, Isochrysis galbana, Chaetoceros calcitrans and a combination of N. oculata and I. galbanaÂ (Nanno+Iso) at different cell concentrations were selected for the experiment and triplicates were maintained for each feed.Â Significant difference (p<0.05) was observed in the filtration and ingestion rates of B. plicatilis, between the treatments. Peak filtrationÂ rate of 12.2x10-5 cells ml-1 ind-1 min-1 was recorded in B. plicatilis fed with Nanno+Iso, followed by I. galbana. Ingestion rateÂ was found to be significantly high (p<0.05)Â for those fed with C. calcitrans, followed by Nanno+Iso. Filtration rate was significantlyÂ high (p<0.05)Â in rotifers stocked at an initial density of 50 nos. ml-1 fed with Nanno+Iso. The results indicated that a combination ofÂ Nanno and Iso is the best suitable microalgal diet for rotifer with peak filtration (12.2x10-5cells ml-1 ind-1 min-1) and ingestionÂ (5.4x10-3 cells ml-1 ind-1 min-1) rates during the first 60 min.