Abstract

BARRIGA-SANCHEZ, Maritza; CHURACUTIPA, Marisol  and  SALAS, Alberto. Elaboration of biological silage from raw rainbow trout (Oncorhynchus mykiss (Walbaum, 1792)) wastes in Puno, Peru. Ecol. apl. [online]. 2019, vol.18, n.1, pp.37-44. ISSN 1726-2216.  http://dx.doi.org/10.21704/rea.v18i1.1304.

The objective of this work was to elaborate biological silage using raw trout (Oncorhynchus mykiss (Walbaum, 1792)) wastes under Puno´s environmental conditions; using koji as a culture of Aspergillus oryzae. First, optimal incubation conditions for A. oryzae (koji) were determined using two local carbohydrate sources: potato and barley as well as rice, under temperatures and times suggested by the experimental statistical design of the surface response method. The response variable was the counting of molds as colony forming units per gram (CFU/g). Next different treatments were postulated with koji inocula under optimal temperatures and times with ground raw trout waste and molasses. pH, acidity, histamine and odor measurements of each treatments were carried out. The results were: temperature and optimum incubation time of A. oryzae at 25 °C and 60 hours in barley, 26 °C and 62 hours in potatoes, 25 °C and 60 hrs in rice. The best treatment was the one with the proportion of raw waste of trout : molasses : koji in rice (10 : 1.5 : 1), pH of 4.5, the score of "5" for odor, and lower values of histamine (83.7 mg/kg) up to 90 days of storage at room temperature. This work offers an alternative for the use of trout wastes in the elaboration of biological silage for swine and sheep feed. It also contributes to the decreasing of organic environmental pollution in Puno, Peru).

Keywords : biological silage; raw waste of trout; Arapa; Puno.

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