Abstract
Tiger Grouper x Cammouflage Grouper (TGCG) (Epinephelus fuscoguttatus x Epinephelus microdon) production is still low nowadays due to the insufficient price of the live feed supply during the larval phase, which is nauplii Artemia sp. One of the live feed types which is able to become a substitute of nauplii Artemia sp. is Moina sp., which has better lysine, histidine, methionine, and leucine contents, besides having the sufficient price for the supply itself. However, Moina sp. is unable to survive in the high salinity, thus it has to be produced as a powder. This condition leads to a further research whether to observe that the Moina sp. powder supplementation is able to become nauplii Artemia sp. substitute through the increased growth and the optimum better lysine, histidine, methionine, and leucine contents in TGCG larvae. The research was conducted using the complete randomized design experimental method. The result showed that Moina sp. powder is compatible as good substitute candidate of nauplii Artemia sp., as it increased the larval length growth, even it had no difference in weight growth, but it was also able to increase the larval lysine, histidine, methionine, and leucine contents.
Highlights
Tiger grouper x Cammouflage grouper (TGCG) fish is a cross-breeding fish hybridization of the male cammouflage grouper (Epinephelus microdon) and the female tiger grouper (Epinephelus fuscoguttatus) (Ismi et al, 2014)
Moina sp. powder had good nutrient and nutrition contents for the larval growth. This was in accordance with the test result of protein and amino acid contents in the feed, which was 38.35% in the crude protein content, 5.79% in lysine content, 1.35% in methionine content, 2.18% in histidine content, and 7.61% in leucine content
The TGCG larvae tended to capture feed that moved horizontally and spreaded on the surface, since TGCG larvae had the vertical swimming habit for catching the feed (Mahjoub et al, 2011). These circumstance caused the decrease level of Nauplii Artemia sp. consumption and would decrease the TGCG larval growth
Summary
Tiger grouper x Cammouflage grouper (TGCG) fish is a cross-breeding fish hybridization of the male cammouflage grouper (Epinephelus microdon) and the female tiger grouper (Epinephelus fuscoguttatus) (Ismi et al, 2014). The lack of live feed supply with the higher price could cause the low production of the breeding business. Nauplii supply, which is part of the live feed given during the larval rearing, often has problem, because it is still obtained commercially in the form of cysts and has insufficient price. Had low levels of amino acid contents, such as lysine, histidine, methionine and leucine. Cysts followed with the low nutrient contents makes it compatible to be substituted using another live feed that has the same or better nutrients content compared with Artemia sp. Is Moina sp., which had higher level of amino acid contents, compared with Artemia sp. Powder will be able to increase the growth and the amino acid contents, besides expecting to lower the production cost during the larval rearing of TCGC A further research needs to be conducted to determine whether Moina sp. powder will be able to increase the growth and the amino acid contents, besides expecting to lower the production cost during the larval rearing of TCGC
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