Aquacultura Indonesiana (2006), 7 (1) : 19a��25

Digestibility and Pellet Water Stability Studies on Azolla Meala��Based Diets forA�Juvenile Black Tiger Shrimp, Penaeus monodon

Agung Sudaryono

Aquaculture Study ProgramA�Faculty of Fisheries and Marine Science, Diponegoro University
Jl. Hayam Wuruk 4a��A, Semarang a�� Indonesia.Ea��mail: agungsud@telkom.net
Diterima 22 Januari 2006; Diterima Publikasi : 24 Maret 2006

Abstract

Agung Sudaryono. 2006. Digestibility and pellet water stability studies on azolla meala��based diets forA�juvenile black tiger shrimp, Penaeus monodon. Aquacultua Indonesiana, 7(1) : 19a��27. The apparent digestibilityA�coefficients of dry matter (ADMD) and crude protein (APD) and water stability in five isonitrogenous practicalA�diets (40% protein) containing azolla (Azolla pinnata) meal as a replacement for soybean meal were determined
with juvenile Penaeus monodon (initial body weight, 0.49A�0.03 g) through digestibility and pellet water stabilityA�trials. An indirect method using chromic oxide (Cr2O3) as an indicator was employed for the determination ofA�digestibility. The water stability experiment was carried out to study the effects of azolla meal (AM) inclusions asA�a dietary protein alternative to soybean meal (SBM) on percentage dry matter leaching of the tested diets. IncreasingA�replacement levels of azolla meal with soybean meal as protein source in the diets (0, 25, 50, 75, and 100%) did notA�significantly affect (P>0.05) on apparent dry matter digestibility (ADMD) and apparent protein digestibility (APD)A�with a range of 76.2i��77.0% and 79.7i��82.0%, respectively. No significant differences (P>0.05) in pellet water stabilityA�during the first 3 hours immersion for all diets (<9.8% feed loss) were also found in the study. However the highestA�inclusion level of dietary azolla meal (100% replacement) showed a worse water stability than the other diets afterA�3 hours immersion period. The results indicate that azolla meala��based diets could be digested as efficiently asA�soybean meala��based diets by juvenile P. monodon and have potential as an alternative plant protein source inA�shrimp diets.

Keywords: Digestibility; Water stability; Azolla meal; Practical diet; Penaeus monodon

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