Finfish Breeding and Hatchery Management (2+1)

Unit 8 - Breeding of trouts

8.4. Stripping and fertilization

• Sex of broodfish is identified based on secondary sexual characteristics which are more pronounced during breeding season.
• Females are slightly larger and have swollen abdomen
• Males are slightly smaller and have round abdomen
• Stripping and fertilization technique is well-developed
• Dry method of fertilization is a common approach
• No hormones are used for spawning in this species.
• Eggs are stripped on to a clean basin and mixed with milt from more than one male to ensure better fertilization and reduce inbreeding.
• Fertilized can be transported after 20 minutes and up to 48 hours after fertilization, but then not until the eyed-stage.
• Exposure of fertilized eggs to direct sunlight should be avoided.