Finfish Breeding and Hatchery Management (2+1)

Unit 12 - Breeding of milkfish

12.3. Induced spawning

• No. of injections – mostly two, sometimes only one; interval between the two – 8-12 h
• Water quality requirements: Salinity – 14-34 ppt, temperature - 21-31⁰C
• Interval between injection and striping : 6-17 h; stripping and artificial fertilization
• Natural spawning is preferred as it is very sensitive to handling; repeated spawning is possible.
• Hatching period : 20-25 h.
  

Hormones and dosage are as follows

Hormone	Dosage
	Female	Male
Salmon Pituitary homogenate	6-10 mg/kg	1/3 dose
HCG	180-2500 IU/kg	1/3 dose
Carp Pituitary homogenate	5-25 mg/kg	1/3 dose
sGnRH-a/mLHRH-a	10-20 ug/kg	-

Larval rearing

• One-day-old hatchlings are fed with Chlorella spp.
• From the 2nd day, rotifer (Brachionus plicatilis) and Artemia nauplii are given .
• In about 20 days, the larvae reach 12-18 mm.