AACL Bioflux, 2015, 8 (2): 142-149

Evaluation of dietary supplementation of aqueousA�extract of brown algae Sargassum cristaefoliumA�on growth performance and feed utilization ofA�juvenile white shrimp Litopenaeus vannamei

1Agung Sudaryono, 1A. Harjuno C. Haditomo, 2Alim Isnansetyo
1Aquaculture Study Program, Faculty of Fisheries and Marine Science, Diponegoro
University, Tembalang Campus, Semarang, Indonesia; 2 Fisheries Department, Faculty of
Agriculture, Gajah Mada University, Kampus Bulak Sumur, Yogyakarta, Indonesia.
Corresponding author: A. Sudaryono, agungsoed@yahoo.co.id

Abstract .A�A 42-day indoor feeding trial was conducted to evaluate the growth performance and feedA�utilization of juvenile white shrimp Litopenaeus vannamei fed with diets containing different supplementA�levels of hot-water extract of brown tropical macro algae Sargassum cristaefolium extract. TheA�commercial white shrimp feeds containing 36% crude protein were incorporated with graded levels ofA�brown algae S. cristaefolium extract (0, 200, 600, 1000 and 1400 mg kg-1) and used in the feeding trial.A�Shrimp (mean initial weight, 2.65A�0.11 g) were fed three times daily ad libitum at an initial feedingA�allowance of 8% total body weight day-1. A completely randomized design was used in the study andA�shrimp were stocked at a density of 10 animals 30 L-1 black round plastic tank in triplicates. ResultsA�showed that the different levels of dietary brown algae extract supplement did not significatly affect (p >0.05) on final body weight (10.6-11.3 g shrimp-1), survival (80-96.7%), and total moulting shrimp (36-48 times). In terms of weight gain and average daily growth (ADG), the diets with no algae extractA�supplement and the highest extract inclusion level of 1400 mg kg-1 diet seemed to have betterA�performance (p < 0.05) than other diets. However, the shrimp fed diets containing S. cristaefoliumA�extract at 200, 600 and 1000 mg kg-1 diet showed a better feed utilization (Feed Conversion Ratio (FCR)A�1.8-2.0; Protein Efficiency Ratio (PER) 1.40-1.56) than those of shrimp fed the algae extract at levels ofA�0 mg and 1400 mg kg-1 diet (FCR 2.38-2.47; PER 1.13-1.17). The results indicated that dietary S.A�cristaefolium extract supplementation had a significant influence (p < 0.05) on feed utilization. ShrimpA�fed the 200-1000 mg algae extract kg-1 diet had a significantly better FCR and PER (p < 0.05) than theA�shrimp fed the 0 mg and 1400 mg algae extract. These results suggest that supplementation of S.A�cristaefolium extract at a dose of 200-1000 mg kg-1 can be used to get a better feed utilizationA�performance (reduce 22% FCR and enhance 27.8% PER) of juvenile white shrimp L. vannamei.A�However, a dose of 600 mg S. cristaefolium extract kg-1 diet is recommeded to add in diet to get a betterA�FCR and PER performance of juvenile L. vannamei.

Key Words: Sargassum cristaefolium, Litopenaeus vannamei, weight gain, feed intake, survival.

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