Drying Janitor Fish for Feeds in Laguna Lake to Mitigate Pollution Potentials

Isabel D Aranda, Edgardo V Casas, Engelbert K Peralta, Jesse C Elauria
Vol 13 No 2 (2010), pp. 27-43




The determination and optimization of drying characteristics of the janitor fish was studied using the regression surface methodology. Fish samples were subjected to drying air temperature of 50 °C, 60 °C, and 70 °C; 0.21, 0.24, and 0.27 ms-1 air velocity, and cuts 1, 2 and 3. The responses observed were average drying rate, final moisture content, rehydration rate, rehydration ratio, and moisture ratio. The drying rate of the sample was significant to air temperature at 95% level. All the other dependent parameters were insignificant due to the restriction of the surface exposed on each cut and the thick scales of the samples. Response surface regression yielded the optimum condition for drying janitor fish of 70 °C, 0.27 ms-1 and 3 cuts. Optimum values observed were compared with the predicted values after verification trials and found acceptable due to lower percent errors. Harvesting, drying, and milling janitor fish for feeds can eliminate the pollution potentials of janitor fish. The polynomial equation that follows describes the drying model in terms of moisture ratio (MR) as a function of drying time (x):

MR=0.99 - 0.0006x + 9.018x2—1.88e-009x3 + 8.28e-013 x4


Keywords: rehydration rate, drying rate, optimization, feeds, Laguna Lake, janitor fish, and moisture ratio, rehydration ratio

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