Abstract: The present study was undertaken to observe fish drying practice in the remote and isolated island of Bangladesh. Experiments were conducted to assess the cured loss of blowfly and its larva “Maggot” infestation, their diurnal activities and seasonal abundance on traditional sun drying of ribbon fish at field level. Experiments were carried out at a concentration of 0.12, 0.06 and 0.03% pirimiphos-methyl (organophosphorus) along with that “Nogos” of 0.25% (present practice) and saturated brine treatment in reducing blowfly infestation. The treatment of saturated brine and 0.03% pirimiphos-methyl gave comparatively good result (yield 41.5 - 41.6%) than control; whereas 0.12 and 0.06% pirimiphos-methyl treatment gave fair result (yield 42.7 - 43.2%), “Nogos” 0.25% treatment gave complete protection against blowfly infestation. Blowfly infestation on untreated control ribbon fish gave an yield 36.6% of about 5% less than the treated one.