Crablet of Mud Crab Scylla Olivacea Production from the Different Stages of Larvae fed Artemia Nauplii Enriched Using Nannochloropsis sp

Abstract

Improvement of feed quality for mangrove crab larvae rearing is one of the important factors to increase of crablet production. The aim of the research was to know the influenzing of enriched Artemia nauplii using Nannochloropsis sp fed to the different stages of larvae Scylla olivacea on crablet production. Twelve units of tanks volume 250 L filled with saline water salinity 30 ppt, aerated, then stocked with new hatched mud crab larvae zoea-1 at the density 100 ind./L. The larvae zoea-1 were fed rotifer, Brachionus sp. and after zoea-3, beside fed by rotifer, the larvae were also fed by Artemia naupli. Four treatments were tested, namely: A). Artemia nauplii enriched using Nannochloropsis sp. was given to the larvae zoea-3 until develop to megalop stage. B). Artemia nauplii enriched using Nannochloropsis sp was given to the larvae zoea-4 until develop to megalop stage. C). Artemia nauplii enriched using Nannochloropsis sp was given to the larvae zoea-5 stage until develop to megalop stage. D). Artemia nauplii without enriched using Nannochloropsis sp. was given to the larvae zoea-3 until develop to megalop stage. Result of the research showed that the highest of Larvae Development Indexes and Megalop Occurence Indexes was obtained in treatment A and resulted the highest of crablet production, then followed by treatment C and B and those were significantly different (P<0.05) with the crablet production in treatment D. The use of Artemia nauplii enriched by Nannochloropsis sp. to feed larvae, S. olivacea stage zoea-3 to zoea-5 until develop to the megalop stage is one of the key factor to enhance the crablet production. By this finding, the crablet production in hatchery will be increased and the mud crab culture in brackishwater pond able to developed.