Tilapia, salmon, tuna and sardine meals were prepared to develop and analyze extruded snacks with residue meal from fish processing. Residue meals were included in five types of corn snacks: control (0% fish meal) and four with 9% tilapia, salmon, tuna and sardine meals. Although moisture, lipids and carbohydrates rates did not differ among the snacks, protein rates increased with the increment of fish meal, reaching 11.85% in the tuna snack. Tuna and sardine snacks had the highest iron levels. The most abundant fatty acids were linoleic, oleic, palmitic, linolenic and stearic acids, with sardine, salmon and tuna snacks presenting the highest values of n-3 series fatty acids. Greater luminosity rate was reported for salmon snack, followed by tilapia, tuna and sardine snacks. The highest sensory acceptance index was verified in tilapia (78.07%) and salmon (72.40%). A 9% addition of residue meals of tilapia, salmon and tuna improved the nutritional value of the snacks.

This study aimed to develop extruded snacks including flour obtained from Nile tilápia carcasses, and then evaluate the chemical composition, colorimetry, thiobarbituric acid reactive substances, and microbiology. There was a significant increase in the levels of crude protein, ether extract, ash, and minerals, as well as a reduction in carbohydrates as more flour was included in the snacks. Increased levels of flavored flour caused reduction in the brightness of snacks. Oxidative rancidity was not detected in snacks. The inclusion of flour improved the nutritional value of extruded snacks without changing sensory characteristics. Microbiologically, the snacks are suitable for human consumption.

O objetivo deste experimento foi avaliar seis métodos de filetagem de tilápia-do-nilo (Oreochromis niloticus), considerando-se o rendimento de filé (RFI); dos músculos abdominal (RMA) e hipaxial (RMH); dos resíduos (PRE); da pele bruta (PPB) e limpa (PPL) e do descarne (PDE). Os métodos utilizados foram: F1= filetagem do peixe inteiro e retirada da pele do filé com a faca (IFP); F2= retirada da pele do peixe inteiro com alicate e filetagem (IPF); F3= peixe decapitado e filetagem, com posterior remoção da pele do filé com a faca (CFP); F4= peixe decapitado, com remoção da pele com auxílio de alicate seguida da filetagem (CPF); F5= peixe decapitado, removidas as nadadeiras, filetagem e retirada da pele com a faca (CNFP); F6= peixe decapitado, removidas as nadadeiras, com remoção da pele com alicate e filetagem (CNPF). Foram utilizadas 20 tilápias por tratamento, num delineamento inteiramente casualizado. O método de filetagem influenciou em todos os rendimentos analisados. O método que proporcionou maior rendimento de filé e de músculo hipaxial foi o IPF (36,58% e 4,22%, respectivamente) e o pior o CFP (33,66% e 3,31%, respectivamente). Para o músculo abdominal, os melhores métodos foram: os CNFP (2,00%) e CNPF (2,02%). Quanto aos resíduos, o método que apresentou o melhor resultado foi o IPF (57,96%), enquanto para pele limpa e descarne o melhor foi o CPF (4,14% e 45,52%, respectivamente), apesar de o método IPF (4,00% e 46,11%) apresentar resultados muito próximos deste.

The objective of this study was to develop and evaluate the microbiological, centesimal composition, and sensory characteristics of cereal bars with fish protein concentrate (FPC) inclusion. Four formulations of cereal bar (CB) were developed with 10% FPC: Treatment 1 (without FPC addition), Treatment 2 (Nile tilapia protein concentrate inclusion), Treatment 3 (Nile tilapia and salmon protein concentrate inclusion), and Treatment 4 (Nile tilapia and tuna protein concentrate inclusion). The microbiological analysis was within the microbiological standards for human consumption. The inclusion of FPC did not influence (p > .05) the content of moisture, protein, lipids, carbohydrates, and calorie value. Only the ash content had higher levels (2.50 to 3.45%). The sensory attributes evaluated and the purchase intent did not differ between treatments. Our results demonstrate that the inclusion of 10% protein concentrates from tilapia, salmon, and tuna byproducts is effective for increasing the mineral matter of cereal bars without affecting their sensory profile.

This study evaluated the chemical composition, fatty acid profile, technological quality, sensory profile and microbiological characteristics of rolls with inclusion of 0, 5, 10 and 15% meal prepared with tilapia carcasses. Moisture and carbohydrate content were linearly reduced (P < 0.05) with increasing inclusion of tilapia meal, but a linear increase (P < 0.0001) was observed in protein (9.91 to 14.30%) and ash (1.74 to 4.65%) content. Lipids and calorific value of the rolls were not affected (P > 0.05) by inclusion levels, but 15% tilapia meal resulted in greater amount of polyunsaturated fatty acids (4.63%) in relation to 0% inclusion (4.46%). There was a linear increase (P < 0.0001) in the firmness of the breads (3.65 to 13.17N) and a linear decrease (P < 0.001) in volume and specific volume. Sensory attributes showed a negative linear effect (P < 0.01), with acceptance rates ranging from 85.24% (0% inclusion) to 70.57% (15% inclusion). It can be concluded that the inclusion of 5 to 15% tilapia meal in roll is effective to increase the protein, mineral matter, polyunsaturated fatty acids and the firmness of the roll, in addition to reducing carbohydrates and volume. Considering the reduction in sensory acceptance, it is recommended to use up to 10% tilapia meal in rolls.