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Growth and morphological development of laboratory-reared larval and juvenile Hemibagrus filamentus (Siluriformes: Bagridae)

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Abstract

Morphological development in laboratory-reared larval and juvenile Hemibagrus filamentus, and behavioral features observed under rearing conditions are described. Body lengths (BL) of larvae and juveniles were 3.8 ± 0.2 (mean ± SD) mm just after hatching and 11.7 ± 1.6 mm on day 15, reaching 26.5 ± 5.4 mm on day 30 after hatching. Aggregate fin ray numbers (for caudal fin, except for procurrent rays) attained full complements in specimens larger than 12.9 mm BL. A maxillary barbel bud appeared on day 0, and all larvae initiated feeding on day 3 with the development of mandibular barbels and conical teeth. Pectoral fin buds and primordial nostrils were present on day 1. Notochord flexion began on day 3, and the yolk was completely absorbed by day 4. Melanophores were scarce at hatching, but increased with growth to cover almost the entire body except the ventral surface of the head and body. Body proportions became relatively constant in juveniles, excepting maxillary barbel length that continued to increase, reaching over 40% BL. Fish were negatively phototactic from day 1. Cannibalism was observed from day 6, continuing to the juvenile stage.

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Acknowledgments

We express our sincere gratitude to staff of the Seng Sa Vang Phan Pa Fish Farm, Vientiane, for technical assistance. Our thanks also go to G. Hardy for his constructive English revision.

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Authors and Affiliations

  1. Fisheries Division, Japan International Research Center for Agricultural Sciences, 1-1 Owashi, Tsukuba, Ibaraki, 305-8686, Japan

    Shinsuke Morioka

  2. Aquaculture Research Unit, Living Aquatic Resource Research Center, National Agriculture and Forestry Research Institute, Khounta Village, Sikhotabong District, Vientiane, Lao P.D.R.

    Bounsong Vongvichith

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  1. Shinsuke Morioka
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  2. Bounsong Vongvichith
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Correspondence to Shinsuke Morioka.

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Morioka, S., Vongvichith, B. Growth and morphological development of laboratory-reared larval and juvenile Hemibagrus filamentus (Siluriformes: Bagridae). Ichthyol Res 58, 245–254 (2011). https://doi.org/10.1007/s10228-011-0219-1

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  • DOI: https://doi.org/10.1007/s10228-011-0219-1

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