Development of morphology, sensory organs and behavior were described for bagrid catfish Mystus nemurus larvae from 0 to 15 days after hatching reared at 28-29℃. First feeding with rotifer (Brachionus plicatilis sp. complex) was observed at 36 hours after hatching (hAH) when the yolk sac absorption was 66.1% and nearly completed at 72 hAH. At this time, the larvae displayed aggregation and foraging behavior as well as negative thigmotaxis and positive rheotaxis. These behaviors corresponded

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... the development of semicircular canals, disappearance of adhesive characteristics at the tips of the maxillary barbel, increasing growth of pectoral fin, opening of mouth and anus as well as peristaltic movement of the intestinal tract. Negative phototaxis and day time foraging coincided with the appearance of deep pigmented eye, single cone cells and optic nerve while night time feeding possibly relied more on taste buds, olfactory organ and free neuromasts. Cannibalistic behavior was first observed at 54 hAH and this corresponded with the initial appearance of teeth. In this study, relationship among the development of morphology, sensory organs and behavior provides fundamental understanding which suggest possible improvement of larval rearing techniques for bagrid catfish.