Khalid William M. Farnar*(1)
(1) Department of Marine Vertebrate, Marine Science Center, University of Basrah, Iraq.
(*Corresponding author: Khalid Farnar. E-Mail: khaled_msc62@yahoo.com).
Received: 12|10|2021 Accepted:22|01|2022
Abstract:
The experiment was designed to study the effect of using fertilizing on the growth of grass carp Ctenopharyngodon idella juvenile reared floating cages developed in an earthen ponds of marine science center, The study continued for six weeks of period from 1/4/2020 to 15/5/2020. The cages was (30 x 30 x 60) cm3 in size , the cages immersed to a depth of 40 cm. six cages were used, with a duplicate of each cage. In cage A the fishes was feed on a standard diet, cage B adding a birds droppings as an organic fertilizer, in cage C urea used as a chemical fertilizer, 20 juveniles of the experimental fish were placed in each cage. the fishes depend on a natural dissolves oxygen in the ponds, the result shows that the rate of the length and weight in the cage A 4.8 cm and 121.16 g, cage B 5.3 cm and 173.26 g, cage C 5.1 cm and 132.78 g, with weight increased 54.76 , 97.95 , 57.17% and with a relative growth rate of 160.68 , 230.06, 175.62% , with a survival rate 70%, 98% , 85% for the cages A, B and C respectively. The results showed that organic fertilizing increased the growth rates of the experiment fishes clearly in the cage C compared to other cages without any side effects and it was the best way to using a fertilize.
Keyword: fertilizing , cages, ,organic fertilizer,urea.
Full paper in Arabic: pdf