Those nine different powders were incorporated into the diet of
shrimp as protein sources and were substituted to part of the fish
meal from yellowfin tuna head, which constituted the major ingredient
of the whole shrimp diet, together with soybean meal, rice bran
and wheat. This fish meal was directly obtained from the Yellowfin
tuna head while the three vegetal ingredients were supplied by the
Long Hiep company, which produces feed for shrimp culture in Nha
Trang, Vietnam. Proximate composition of the dietary protein ingredients
incorporated into each diet is given in Table 1.