A Study on The Cultured juvenile Clarias lazera In The Pond

The present paper dealt with that the cultured zooplankonts were proper as initial feed for juvenile Clarias lazera and growing feed for youth in the pond.The results showed that the body length of four days old juvenile increased to 3 cm and above after feed the zooplankonts for 13 days with a 23.2-30.3℃ water temperature.The survival rate of juvenile was more than 60%.The width of mouth of four days old juvenile was about 760-900 μm.The cladoceran,copepods and chironomids were mainly taken by juvenile at earlier stage of the growing period before 13 days old.When the age of juvenile grew up to fourteen days and above,they mainly took rotifers,juvenile aquatic insects and mix feed instead of cladocerans,copepods and chironamids.The feeding proportion of juvenile was more than 90%,the fullness degree of stomach of the most juvenile arrived to 3-5 degree with cladoceran,copepods and chironomids.There was a linear relation between body length and days age,and an exponential function was shown between body weight and days age,and the same function was also shown between body length and body weight.The growth speed of body length was constant,but the growth speed of body weight was acceleation.