Health & Environmental Research Online (HERO)


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2625812 
Journal Article 
Drying Janitor Fish for Feeds in Laguna Lake to Mitigate Pollution Potentials 
Aranda, ID; Casas, EV; Peralta, EK; Elauria, JC 
2010 
13 
2 
26-43 
WOS:000289226600003 
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 degrees C, 60 degrees C, and 70 degrees 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 degrees 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 + 9.018x(2-)1.88e(-009)x(3) + 8.28e(-13) x(4) 
janitor fish; Laguna Lake; feeds; optimization; drying rate; rehydration rate; rehydration ratio; moisture ratio