2. Definitions
•
A hatchery is a facility for breeding fish to produce fry
and fingerlings for grow-out.
•
Fry are the very young tilapia soon after hatching.
•
Fingerlings are juveniles 1–3 g in weight that have
completed a nursery phase of culture and are ready to
be stocked into grow-out ponds.
•
Grow-out is stocking tilapia fingerlings into ponds and
feeding them until they are big enough to be eaten or
sold
3. 22/10/2008 Dr Waleed El-Hawarry
Male papilla
Female papilla with
oviduct
anus
anus
Visual Selection of the Genital Papilla
4. 1. Early in one
afternoon, the dominant
male begins to clean
the spawning area that
he guards.
2. The male displays
his reflective side to
females and induces
their final ovary
maturation.
5. • 3. A female with
mature follicles
enters the dominant
male's spawning
area and cleans the
area with him.
• 4. The male and the
female
communicate
through body
vibration while
discharging gamete
6. 5. The female
picks up eggs
and sperm strings
and fertilization
occurs in her
month.
