Khalid William Farnar(1) and Qusay Hamid Al-Hamadany*(2)
(1). Department of Aquaculture and Marine Fisheries, University of Basrah, Basrah, Iraq.
(2). Marine Science Center, Basrah, Iraq.
(*Corresponding author: Qusay Hamid Al-Hamadany. E-mail: email@example.com).
Received: 09/06/2019 Accepted: 24/07/2019
This research studied the effect of using artificial colored diets on feeding common carp juvenile Cyprinus carpio in plastic basins under laboratory conditions with an initial length and weight of 3.25 ± 0.1405 cm and 16.216 ± 0.1512 g respectively. Four treatment (A, B, C and D) were used depending on the color of the diets, as follows: treatment A as (control), treatment B in a green color, treatment C in a red-colored and treatment D in a blue-colored. The juveniles were distributed as 30 juveniles in each basin, the experiment lasted for 60 days. The fish were fed daily with two meals. The results of the present study showed that the treatment in red color was the most color-motivated and responsive by the fish of the experiment and with a shorter period of time compared to the rest of the treatments followed by treatment in blue and green color. The fish in the treatment C recorded the highest weight up to 121.50 g and the lowest weight in treatment A recorded 95.196 g. The highest value of the relative growth rates of fish at the end of the experiment was 659.47 % in treatment C and below 528. 31 % in treatment A and qualitative growth at the end of the experiment above 3.379 (% g/day) in treatment C below 3.063 (% g/day) in treatment A shorter time span for food exploration and feeding response was 32 seconds and a time interval of 19 minutes and 44 seconds for consumption of all food, while in treatment A the fish took longer to explore food and respond to feeding 15 minutes and 52 seconds and 1 hour, and 3 minutes and 34 seconds for consumption all food.
Keywords: Common carp, Colored diets, Growth rate.
Full paper in Arabic: PDF