FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Artemia, Clarias gariepinus, growth-parameters, rotifer, whole-chicken egg, zooplankton
A sixteen-days’ trial feeding was conducted in the Aquaculture Laboratory of the University of Jos, Nigeria to assess the survival and growth performance of Clarias gariepinus fry on four diets in aerated and unaerated nursery conditions: freshwater rotifer (Brachionus calyciflorus) cultured on yeast, freshwater rotifer cultured on algae, whole chicken egg and shell-free Artemia. 100 fry each were placed in 15 litre plastic tanks with 10 litres of water. Each experimental unit had two replicates. Trial feeding commenced on the 6th-day-post-hatch. Counting and measurement of lengths and weights were taken before and after the feeding trial to determine the percentage survival, mortality rate, percentage length increase, percentage weight gain, condition factor and specific growth rate. The unaerated shell-free Artemia treatment had the highest percentage survival (75%) while the highest mortality rate (0.33) was in the aerated whole egg treatment. The unaerated algae-fed rotifer treatment had the best of the growth parameters: percentage length increase (30.56%), percentage weight gain (2600%), condition factor (2.09 g/mm3) and specific growth rate (20.60%/day) while the worst was in the aerated whole chicken egg treatment. Two-way ANOVA and DMRT on the Microsoft® Excel® platform revealed a significant interaction between the nursery condition and feed-type in all the growth parameters determined (P<0.05). There was also significant difference between aerated and unaerated treatments in all the growth indicators assessed (P<0.05) but there was no significant difference in percentage survival and mortality rate (P>0.05). The findings indicate that shell-free Artemia is best for the survival of Clarias gariepinus fry while algae-fedrotifers ensure best growth. It also suggests that catfish fry performs better in unaerated nursery condition than aerated one.
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