The attachment rate of microalgae Pavlova sp. and Chaetoceros sp. for food of abalone larva

Supply of live feeds becomes one of the most important factor in supporting the successful of abalone hatching. At larva phase, abalone fed with live feeds microalgae. Some of live feeds for mollusks are Pavlova sp. and Chaetoceros sp.. This research was aimed to know the attachment rate of microalgae Pavlova sp. and Chaetoceros sp. for abalone larva food. The result showed that cell of Pavlova sp. and Chaetoceros sp. had growth at both semi-mass and mass scale. The growth rate of both types of live feeds at semi-mass scale were valued 46 cell mL-1 day-1 for Pavlova sp. and cell mL-1 day-1 for Chaetoceros sp.. The growth rates at mass scale were divided into the rate at column water (25 cell mL1 day-1 for Pavlova sp. and 18 cell mL-1 day-1 for Chaetoceros sp.) and attachment media (42 cell mL-1 day-1 for Pavlova sp. and 27 cell mL-1 day-1 for Chaetoceros sp.). Based on the result, the rate growth for Pavlova sp. at attachment media showed greater value than the rate growth for Chaetoceros sp.. Both types of microalgae could be provided as live feeds for abalone larva by noticing the growth phase at attachment media which started to provide at third day of live feeds culture.