(HEMIBAGRUS GUTTATUS LACÉPÈDE, 1803)
IN QUANG BINH PROVINCE
Le Van Dan*, Le Tien Huu
College of Agriculture and Forestry, Hue
University
Abstract: This study aims to improve the production of
Ca Lang fish seedling for aquaculture development
in Quang Binh province and contribute to the conservation of this kind of catfish. The results show that the
size of sexual maturity is 66 cm in length and 2.87 kg in weight in average for females and 74 cm and 3.53
kg for males, respectively. The spawning season starts from April to early June. The highest maturity rate
is 100 % in males and 67 % in females in June. The suitable hormone stimulant for spawning fish is LRHa
and Dom with the effective dosage at 30 μg LRHa and 6mg Dom/kg females. At temperatures of 26–28
o
C,
the response time is 22–25 hours with a reproduction rate of 100 %. Actual
fecundity of this species
fluctuates from 3 146 eggs/kg females to 4 195 eggs/kg females. The fertilization
rate and hatching rate
were 48,3–54,4 % and 38,2–47,3 %, respectively. The fry rate is from 579 fries/kg females to 966 fries/kg
females.
Keywords: Ca Lang, fish seedling, hormone stimulant, maturity rate