Paper Information

Journal:   JOURNAL OF VETERINARY RESEARCH   2007 , Volume 62 , Number 5; Page(s) 263 To 268.
 
Paper: 

EFFECT OF TEMPERATURE ON POSTOVULATED OOCYTE QUALITY MAINTENANCE IN FEMALE RAINBOW TROU, ON CORHYNCHUS MYKISS

 
 
Author(s):  MOHAGHEGHI SAMARIN A., RAFIEI GHOLAM REZA, MOJAZI AMIRI B., AHMADI M.R.*, VILAKI A.S.
 
* DEPARTMENT OF HEALTH AND AQUATIC DISEASE, FACULTY OF VETERINARY MEDICINE, UNIVERSITY OF TEHRAN, TEHRAN, IRAN
 
Abstract: 

Effect of temperature on the duration of post ovulated oocyte quality maintenance in abdominal cavity of female rainbow trout, Oncorhynchus mykiss, was assessed to determine suitable time of stripping. Egg quality measurement was done through assessing the eying and hatching rates of eggs.
Regarding the best temperature range reported for salmonid brood fish in breeding season (3-10oC) the study was undertaken in two temperatures of 2 ± 0.5oC and 8 ± 0.5oC. In each of the noted temperatures, 15 female brood fish were used as 15 replicates and stripped 5 times. Time interval of each two spawning was 7 days. Results indicated that temperature has a significant effect on the suitable time of stripping. When the temperature increased from 2oC to 8oC, the optimum eyeing and hatching rates were transferred from second week to the first one. Also, eyeing rate was decreased from 83% for the fifth treatment at 2oC to 3.6% at 8oC. The same trend was observed for the hatching rates. The decrease of post ovulatory suitable stripping time from 30 days in 2oC to two weeks in 8oC, shows the role of temperature on egg quality maintenance and confirms that the increase of water temperature in optimal living range, shortens the suitable post ovulatory time of stripping. This time duration estimated at least 21 DPO at 2oC and 14 DPO at 8oC. Also the time needed for overripening of the eggs estimated more than 224 Degree-Days. So the time duration of post ovulated oocyte quality maintenance in abdominal cavity of female rainbow trout is highly dependent on water temperature.

 
Keyword(s): OVULATION, TEMPERATURE, EGG QUALITY, ABDOMINAL CAVITY, ONCORHYNCHUS MYKISS
 
References: 
  • ندارد
 
  Persian Abstract Yearly Visit 52
 
Latest on Blog
Enter SID Blog