Authors: RAMEZ AL HAZZAA, ABDULRAZAK HUSSEIN
Abstract: Larval development of the himri barbel, Barbus luteus Heckel, reared at 19-22 °C in natural daylight is described. Morphological and some functional character appearances were similar to the main ontogenetic steps of development in most cyprinids. Small hatched larvae attained both metamorphosis and a length of 10.5 mm after almost 35 days. Relative growth of the selected body proportions demonstrated typical priorities in growth compared to the length. An ontogenetic index was inferred from applying age and length criteria at metamorphosis as a scale for ontogenetic events.
Keywords: Barbus luteus, Euphrates, Tigris, larva, ontogeny
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