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 theimportant factors to increase of crablet production. The aim of the research was to knowthe influenzing of enriched Artemia nauplii using Nannochloropsis sp fed to the differentstages of larvae Scylla olivacea on crablet production. Twelve units of tanks volume 250L filled with saline water salinity 30 ppt, aerated, then stocked with new hatched mud crablarvae 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. Fourtreatments 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 enrichedusing 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 stageuntil develop to megalop stage. D). Artemia nauplii without enriched using Nannochloropsissp. was given to the larvae zoea-3 until develop to megalop stage. Result of the researchshowed that the highest of Larvae Development Indexes and Megalop Occurence Indexeswas obtained in treatment A and resulted the highest of crablet production, then followed bytreatment C and B and those were significantly different (P<0.05) with the crablet productionin 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 factorto enhance the crablet production. By this finding, the crablet production in hatchery will beincreased and the mud crab culture in brackishwater pond able to developed.

THE EFFECTS OF AN ARTIFICIAL COMMERCIAL FEED SUPPLEMENTATION ON LARVAL REARING AND CRABLET PRODUCTION OF MUD CRAB Scylla tranquebarica

“…In this research the duration in each stage to develop to the consecutive stage was required varies days, namely zoea-1 to zoea-2, zoea-2 to zoea-3, zoea-3 to zoea-4, zoea-4 to zoea-5, zoea-5 to megalopa stage were required 7, 9, 10, 8, and 7 days respectively. These are much longer compared to the normal development of S. olivacea larvae from stage of zoea-1 to zoea-2, zoea-2 to zoea-3, zoea-3 to zoea-4, zoea-4 to zoea-5, and zoea-5 to megalopa, reported only required at 6, 4, 3, 4, 5 days respectively (Gunarto et al, 2016).…”

“…The larval development of S. tranquebarica in this research was fast, reaching megalopa stage at day 18 ph. In authors' earlier study, it was found that larvae development of S. olivacea reached megalopa stage at day 21 ph (Gunarto et al, 2016). Different stocking densities of larvae in the rearing tanks contribute to the accelerated larval development.…”

“…Based on the physical and physiological development of mud crab larvae, some evidence suggest that larvae at zoea-3 stage can accept artificial feed for their diets. The authors' earlier research on mud crab larvae rearing, only rotifer and Artemia nauplii enriched using HUFA (highly unsaturated fatty acid) were fed to the mud crab larvae without supplementation of artificial feed (Gunarto & Herlinah, 2015;Gunarto et al, 2016). However, Holme (2008) conducted a study where an artificial feed (microbound feed size <100 microns) was supplemented to provide an essential nutrition needed by larvae for their growth and development.…”

“…Mud crab S. tranquebarica larvae development based on the characteristic developed byGunarto et al (2016) …”

Data on population density, growth, survival, water quality, larval stage index and ingestion rate of selected microalgae of portunids crabs at different feeding regimes

“…The MOI value was calculated based on the occurrences of M per 100 individual Zoea-5 [14], [15]. In example when the number of M found in 100 larvae (Zoea-5) is seven, then the MOI value is 0.07 (7%).…”