Feeding Rate of Brachionus plicatilis O. F. Müller on Two Types of Food Depending on Ambient Temperature and Salinity

✍ Scribed by L. I. Lebedeva; O. N. Orlenko

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 625 KB
• Volume: 80
• Category: Article
• ISSN: 1434-2944
• DOI: 10.1002/iroh.19950800110

✦ Synopsis

Feeding rates of Brachionus plicatilis were studied for two types of foodalgae Monochrysis lutheri and baker's yeast Saccharomyces cerevisae. The main regularities of changes in filtration rate and ration were studied in small culture volumes (1 ml) for adult amictic females depending on food concentration (1, 2, 4, 8 and 16 . 106 cells . ml-1). ambient temperature (16 and 26 "C), and salinity ( 5 , 10, 15, 20, 25 and 30 ppt). B. plicatilis ration did not depend on the salinity, but was largely determined by temperature and food concentration. It was found that at 16 and 26 "C the dependence of the ingestion rate (ration) on food concentration differed greatly. A hypothesis was suggested to explain this phenomenon. A critical concentration of both types of food at which the increase in the rotifer ration ceased is 4 . 106 cells . ml-1. This is the minimum "background" food concentration for B. pliccitilis mass cultivation.

The average rations measured at the concentration of M. lurheri and S. cerevisae of 4 . lo6 cells. ml-1 where 1.3 f 0.1 and 4.8 f 1.3 pg dry weight.. ind-I .day-( at 26 "C and 0.54 f 0.1 and 1.9 pg d. w. . ind-1 . day-' at 16 "C, respectively. The rations obtained in the laboratory were corrected for the conditions of rotifer commercial production in the open field in summer time. The correct values were 0.86 and 0.72 pg d. w. . ind-1 . day-l for algae and yeast, respectively.