Ảnh hưởng của độ mặn lên sự tăng trưởng và chuyển hóa thức ăn cửa rô phi vằn (Oreochromis niloticus) và cá diêu hồng (Oreochromis sp.)

Nile  tilapia  (Oreochromis  niloticus)  and  red  tilapia  (Oreochromis  ssp.)  are  important aquaculture  species  in  Vietnam.  The  aim  of  the  current  study  was  to  assess  the  growth performance and feed utilization of Nile and red tilapias under different salinity conditions. The experiments were designed with salinities of 0, 15 and 25 ppt in 500-L tanks. The growth performance  was  evaluated  using  various  indices,  including  weight  gain  (WG),  specific growth rate (SGR), food conversion rate (FCR) and daily food intake (DFI). Results after a 55 days experiment showed that WG, SGR were highest at 0 ppt and lowest at 25 ppt for Nile tilapia while these values were highest at 25ppt and lowest at 0 ppt for red tilapia. The same pattern  also  observed  for  DFI.  There  were  no  significant  differences  for  FCR  among  the treatments  of  Nile  and  red  tilapias,  except  a  significant  high  FCR  was  observed  for  Nile tilapia at 25 ppt. Possibility of Nile and red tilapias culture in saline water were discussed.