Effects of initial weight on growth criteria of grass carp, Ctenopharyngodon idella cultivated in earthen ponds

Abstract

The current experiment was conducted in the Agricultural Research Station-Aquaculture Unit, College of Agriculture, University of Basrah from 27th June to 10th Nov 2020 in Al-Hartha District about 16 km northern-east of Basrah Governorate (30o65`64.6"N, 47o 74`79.5"E). Six earthen ponds (600 m3) were used to investigate the effect of three different initial weights of grass carp, Ctenopharyngodon idella [220.1-276.8 g (T1); 146.5-169.3 g (T2); 81.5-82.7 g (T3)]. Fishes were fed 3% daily using commercial pellets manufactured by Agricultural Consultant Office. The results of the current study indicated that T1 had better growth criteria (WI= 296.8 g, DGR= 2.53 g/day, SGR= 0.59%/day and FCR 5.23) compared with the other two treatments. There was a negative allometric pattern of growth (b less than 3) in the three treatments before and after the experiment. Statistical analysis of the results proved that there were significant differences (P≤0.05) in the modified condition factor (Kb) between the three treatments at the end of the experiment, while there were no significant differences (P>0.05) in the relative condition factor (Kn) and Fulton’s condition factor (K). It was concluded from the current experiment that the initial average weight of the grass carp must not be less than 250 g to achieved good results for fish culturist.

Effects of Alien Organisms on Growth of Common Carp, Cyprinus carpio Cultivated in Earthen Ponds

“…Positive allometric growths (b=3.319) were recorded for some populations of common carp in Almus Dam Lake and also for Ömerli Reservoir (b=3.140) (Karataş et al, 2007;Vilizzi et al, 2013). Taher et al (2021) The low value of modified condition factor (Kb) in current experiment may be related to the high value for b. Taher et al (2021) recorded 0.31, 1.01 and 1.47 as Kb, Kn and K3, respectively for common carp cultivated with grass carp and 0.98, 1.01 and 1.35 when cultivated alone in earthen ponds.…”

“…Taher et al (2021) The low value of modified condition factor (Kb) in current experiment may be related to the high value for b. Taher et al (2021) recorded 0.31, 1.01 and 1.47 as Kb, Kn and K3, respectively for common carp cultivated with grass carp and 0.98, 1.01 and 1.35 when cultivated alone in earthen ponds. Al-Dubakel et al(2022) recorded condition factors ranges as 0.19-0.79, 0.99-1.05 and 1.38-1.56 of Kb, Kn and K3 respectively for common carp cultivated in and outside cages at earthen ponds.…”

“…The differences between the results of other studies and current study may be related to the differences in initial weights and cultivation system. Taher et al (2021) recorded DGR of 5.92 and 3.70 g day −1 , SGR 1.07 and 0.98 % day −1 , FCR of 2.24 and 2.46 for common carp cultivated with grass carp or alone respectively. Al-Dubakel et al (2022) recorded DGR range of 3.41-4.33 g day −1 , SGR 0.88-1.00 % day −1 , FCR 2.67-2.77 for common carp cultivated in and outside cages at earthen ponds.…”

A Comparison of External Parasites Pathogenic to Fish in Two Fish Ponds Located in Kirkuk Governorate

“…The average infection rate in Daqoq was approximately 14%, whereas the average infection rate in Lailan was around 8%. Lailan can be considered safer for fish health, given the lower infection rate with head kidney worms [11].…”