Tilapia is the most produced fish in Brazil, occupying the 4th position of the most
cultivated in the world. This position is due to relevant aspects, such as fast
growth, they do not require sophisticated technology, accept a wide variety of
foods, good feed conversion, are resistant to many diseases and spawn
throughout the year, in addition to having excellent flavor and texture. The
Amazonian Pintado is a hybrid fish resulting from the crossing between cachara
(Pseudoplatystoma spp.) and Amazonian jundiá (Learius marmoratus). It has
good organoleptic qualities and excellent carcass yield, characteristics that are
very favorable to serving the consumer market. Protein is the most expensive
component of an animal's diet, and its quality in one food can be compared to
that of another by the composition of amino acids, especially the proportion of
those essential. Fishmeal is considered a standard ingredient in diets for aquatic
organisms due to aspects such as high biological value and its balance in amino
acids, however, it has a high cost and its manufacture is of low quality and lower
biological value. Meat and offal meal has been used to partially or totally replace
fish meal in commercial feeds. Bovine liver flour (BLF) is a protein source with
important potential in fish nutrition due to its nutritional qualities. The objective of
this experiment was to evaluate the inclusion of BLF in diets for juveniles of Nile
tilapia, Thai lineage and juvenile of Amazonian Pintado, in order to determine
their zootechnical and economic performance. For Nile tilapia juveniles, it was
found that the inclusion of 20% of BLF provided better productive performance
and better economic return, being, therefore, recommended. For Amazonian
painted juveniles, considering the productive perfomance and cost incidence, the
inclusion of 10% BLF is recommended.
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