Vol. 4, Issue 1 (2019)
The effect of the gradual salinity increase on some growing character of the common carp (Cyprinus carpio)
Author(s): Hasan Al-Hilali, Mohamed Al-kshali
Abstract: This study was conducted to demonstration the effect of high salinity gradually in the total daily and the relative and qualitative growth rate of fish common carp (Cyprinus carpio), as were exposed fish gradually to concentrations of salt 5, 10 and 15 g / liter as well as water liquefaction (treated 0.1 control g / liter) Like all independent concentration saline treatment included repeating. Distributed Fish experiment on 8 Aquarium glass at 10 fish / Aquarium at a rate of weight 15 ± 3 g to study the effect of salinity in the total growth and Daily growth rate, results reduced Total growth in high salinity reaching 32.6 and 14.8 and - 12.3 g of concentrations Saline 5, 10 and 15 respectively as compared with the control treatment amounting to 45.5 g, and dropped the daily rate of growth to 0.36 and 0.16 and 0.13 - g / day increase concentrations of salt to 5, 10 and 15 respectively as compared with the control treatment, in which the daily growth reached 0.50 gm / day, and the relative growth rate of 24.21 and 11.12 and 9.38% - in concentrations of salt 5, 10 and 15, compared with treatment to control 34.46% and stood at 0.10 qualitative growth rate and 0.05 and 0.3% - g / day for concentrations of salt 5, 10 and 15, compared with the Treatment control 0.14% g / day. Fish fed during the experiment, which persist 90 days on a diet of 31% protein content.