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Thiamin Requirement of Juvenile Shrimp (Penaeus monodon)¹

Institute of Marine Biology, National Sun Yat-sen University, Kaohsiung 804 Taiwan ^* Institute of Biochemistry, College of Medicine, National Taiwan University, Taipei 100 Taiwan, Republic of China

In a 9-wk feeding trial, juvenile shrimp (Penaeus monodon) were fed semipurified diets containing seven levels (0, 20, 40, 60, 80, 160 and 320 mg/kg diet) of supplemental thiamin hydrochloride. The dietary thiamin level required for optimal growth in P. monodon was found to be 14 mg/kg diet based on hemolymph (blood) thiamin analysis. The minimum dietary thiamin level that produced substantial shrimp growth was 13 mg/kg diet. Shrimp fed unsupplemented diets (thiamin content of 0.12 mg/kg diet) did not demonstrate specific deficiency signs, except those universal signs such as retarded growth, poor food conversion and low survival rates.

KEY WORDS: • thiamin • shrimp • thiamin pyrophosphate

¹ Supported by grants (NSC79-0209-B110-03 and NSC79-0412-B002-05) from the National Science Council of the Republic of China.

² To whom correspondence should be addressed.

Manuscript received 10 April 1991. Revision accepted 18 June 1991.