December 2018, Vol. 3, No. 12, pp. 262-268.
Effects of Background Colour on Incubation and Larval Rearing of African Catfish Clarias gariepinus (Burchell, 1822) in Water Recirculating System
Alabi I Korede¹,*, S. Ocholi Oyigene²
¹Department of Agricultural Extension and Management, Federal College of Forestry, Jos. Nigeria.
²Department of Fisheries and Aquaculture, Federal University of Agriculture, Makurdi, Nigeria.
*Corresponding author’s e-mail: firstname.lastname@example.org
The present study investigated the effects of background colour on hatchability and growth performance of Clarias gariepinus (Burchell, 1822) larvae in Water Recirculatory System. A simple 660 Litres Water Recirculation System (WRS) technology made of black and white rearing tanks was developed, built and evaluated for this study. The experiment was divided into two phases; artificial propagation using synthetic Ovaprim hormone and rearing the hatchlings for 14 days; and rearing the 14 days old fry for 42 days. In the first phase of the experiment, 2 grams fertilized eggs were incubated. Hatchability was estimated 24hours after incubation, while in the second phase, growth performance and feed utilization of hatchlings were investigated. Daily water replacement was maintained at 66 Litres for 42days. Hatchability results indicated that Black trough had high hatchability rate of 83.45±3.17%. Mean Weight Gain (MWG) of fry in black trough were significantly higher (4.55±0.09) than White trough (4.47±0.09). Specific Growth Rate (SGR) was observed to be lower in White trough (8.49±0.87). Food Conversion Ratio (FCR) followed a different pattern as fry in black trough (109.89±16.88) recorded low mean values. However, there were no significant difference (p>0.05) between the White and Black troughs in growth parameters investigated. Shooters (%) were observed to be higher in Black troughs (26.67%) while %Survival was high in white troughs (78.67%). Results of Water quality parameters indicated an optimum water quality for growth and survival of Clarias gariepinus within the facility. This study revealed that Black background tanks performed better for incubation and rearing Clarias gariepinus.
Keywords: Clarias gariepinus; Trough; Hatchlings; Fry; Ovaprim; Water Recirculatory System.
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