بحث بعنوان(Effect of Different Concentration of Salinity on the Survival and Feeding of fingerling, Silver Carp (Hypophthalmichthys molitrix) للسيد سجاد عبد الغني التدريسي في كلية التربية القرنة

Effect of Different Concentration of Salinity on the Survival and Feeding of fingerling, Silver Carp (Hypophthalmichthys molitrix) (Valenciennes 1844)

Sajad A. Abdullah

Department of Biology, College of Education-Qurna

University of Basrah, Basrah, Iraq

E-mail: SajadGeni@yahoo.com     

Abstract

In the present study different concentration of salinity (4,6,8,12 and 14ppt) was studied  for 21 days  during December 2015, and compared with (1.4ppt), to investigate its effects on growth, nutrition and survival percentage rate of Silver carp (Hypophthalmichthys molitrix). The average of water temperature  was 18.17°C±1.3, dissolved oxygen was7.9 ± 0.60( mg/l), hydrogen ion 8.13 ± 0.327.The study showed that the mortality percentagefor fish exposed to 14 ppt of salinity  was 100% after 24 hours, while the others was exposed  to different concentration of salinity (4,6,8,12ppt) were (0,0,0, and 25)% respectively after 21 days comparing with control (1.4ppt) was 0%. Inversely relationship was seen between food intake percentage and various concentration of salinity, the highest percentage of food intake 6.11% in treatment of control (1.4ppt) and the lowest 1.99% in concentration 12ppt.  Statistic analysis was demonstrated that there significant differences (P<0.05) in rate of food intake ratio between treatments 1.4, 4, 6, and 8, 12ppt.

Key words; silver carp, Salinity, Mortality percentage and food intake.