Fundamentals - Fish & Biology
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![Devario devario (Posterior half enlarged): Showing a narrow bluish (peacock blue) iridescent band commencing about the middle of posterior half of body, becoming wider at the caudal peduncular end and then continuing along middle of caudal fin, thence narrowing along the 4 lower fin rays of the upper caudal lobe. The bluish band is flanked dorsally by a parallelly running yellow band and similarly by a fainter one along the lower border [as if the yellow spots on the flanks coalescing to form a band towards the posterior extremity].](https://www.fishbiopedia.com/wp-content/uploads/2019/12/cVJZ7r-e1576433112716-1.jpg)