The food and growth of pelagic 0+ Alestes nurse (Characidae) from the Blue Nile,near Khartoum |
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Authors: | S A Guma'a M Yassin |
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Institution: | (1) Department of Zoology, Faculty of Science, University of Khartoum, Sudan |
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Abstract: | The food, feeding habits and growth of 0+ Alestes nurse (Rüppel) from the Blue Nile near Khartoum, was investigated. 0+ A. nurse were observed to change their food from phytoplankton and small zooplankton during their pre-metamorphosis stages, to larger zooplankton (Daphnia spp., Chydorus sp.) and insects (larvae, pupae and imagines) during their post-metamorphosis stage.Their growth in length and weight was characterized by two distinct stanzas; during the first stanza, the fish increased in total length at a rate of 0.196 mm mm–1 wk–1, and in wet weight at a rate of 0.430 g g–1 wk–1. These rates were reduced during the second stanza to 0.046 mm mm–1 and 0.080 g g–1 wk–1, respectively. The calculated value of the exponent b in their length-weight relationship suggested that their growth was allometric. |
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Keywords: | Sudan Alestes growth feeding Nile |
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