LEVEL OF CRABLET PRODUCTION IN MANGROVE CRAB Scylla paramamosain WITH FEEDING ENRICHMENT USING HUFA AND VITAMIN C ON LARVAE STAGES

Abstract

<jats:p>The objective of the research was to determine the best enrichment of rotifer and the naupli of Artemia as feed for mud crab, S. paramamosain larvae, also to know their increasing of the DHA/EPA ratio and vitamin C content. Four treatments were tested, namely : A) Mud crab larvae every two days were given rotifer and naupli of Artemia enriched with HUFA and vitamin C also added RICA-1 probiotic at 2 mg/L, B) Mud crab larvae every two days were given rotifer and naupli of Artemia enriched with HUFA and vitamin C, C). Mud crab larvae every two days were given rotifer and naupli of Artemia enriched with vitamin C, and D). Mud crab larvae every three days were given rotifer and naupli of Artemia enriched with vitamin C. Result showed that the crablet production from the highest to the lowest was as follows: treatment A (177.5+17.6 ind./tank), treatment B (160+14.1 ind./tank) (A and B showed no significant different results (P&gt;0.05)), treatment C (136+5.6 ind./tank), and treatment D (106+8,5 ind./tank) (C and D results indicated a significantly different (P&lt;0.05) with treatment A). Higher level of DHA/EPA ratio of 69.23% was found on rotifer enriched with HUFA, while on naupliofArtemia only 28,72%. Higher level content of vitamin C was 50.56% in rotifer enriched with vitamin C, while in naupli of Artemia was only increase to 35.56%.Keywords: Scylla paramamosain larvae, enrichment, HUFA, vitamin C, crablet</jats:p>

Nursery Culture of Mud Crab, Genus Scylla, a Review: The Current Progress and Future Directions

“…The low content of both EPA and DHA in rotifers and Artemia could affect the vitality of larvae [53,57,58]. Inappropriate lipid profile for marine crustaceans, found in rotifer and Artemia nauplii, could affect both larval development and survival of mud crab larvae [44].…”

Effects of different feeds and stocking densities on growth and survival rates of mud crab (Scylla paramamosain) at the stage from megalopa to crablet-1

“…Crabs are among the seafood items that are globally distributed, with a consistently growing demand. 1,2 It has been determined that four species are under the genus Scylla, including Scylla olivacea, S. paramamosain, S. serrata, and S. tranquebarica. All these species are known to have great potential for commercial aquaculture because they tolerate environments with poor water quality and are highly resistant to pathogens.…”

“…Mud crabs are currently cultured extensively in many countries, especially Southeast Asian countries. [1][2][3][4] Among them, two species, S. paramamosain (locally called Lotus crab) and S. olivacea (called Fire crab), are distributed naturally in Vietnam, with over 95% of S. paramamosain and only about 5% of S. olivacea in their population. 5,6 S. paramamosain is recently considered one of the most important species for aquaculture in coastal areas of the Mekong Delta region of Vietnam, where the impacts of climate change and saltwater intrusion are more and more evident because it has good adaptability to environmental conditions in these areas and has high prices in both domestic and foreign markets.…”

“…For the natural and live feeds, Artemia with live or frozen forms has often been practiced with the addition of prawn or shrimp meat, fish meat, and dried shrimp. Besides, Acetes shrimp, 25 dried mud worms, or artificial feed (larva-shrimp feed), 3,9,10,26 minced trash fish, green mussels, 15 brown mussels, 1 or artificial feed 10,[27][28][29] have also been used. Some previous studies have shown that the role of natural feed in the hatchery in the larval stages of mud crabs cannot be completely substituted for artificial feed, but the combination of them is still recommended.…”