Site pages
Current course
Participants
General
Topic 1
Topic 2
Topic 3
Topic 4
Topic 5
Topic 6
Topic 7
Topic 8
Topic 9
Topic 10
Topic 11
Topic 12
Topic 13
Topic 14
Topic 15
Topic 16
Topic 17
Topic 18
Topic 19
Topic 20
Topic 21
Topic 22
Topic 23
Topic 24
Topic 25
Topic 26
Topic 27
Topic 28
Topic 29
Topic 30
Topic 31
Topic 32
Topic 33
Topic 34
Topic 35
Topic 36
Topic 37
9.3. Selection of broodfish and breeding technique
Unit 9 - Breeding of tilapia
9.3. Selection of broodfish and breeding technique
Artificial breeding is undertaken to produce fry on a large scale, reduce mortality and produce monosex seed.
They are asynchronous multiple spawners, spawning naturally in stagnant waters.
Mature broodstock is identified based on their secondary sexual characters, as detailed below:
Character |
Male |
Female |
Body colouration |
Dorsal and lateral sides are darker than the ventral region |
Dull and grey throughout the body |
Size and Shape |
elongated, belly not inflated, larger |
Stout, belly is inflated, smaller |
Genital opening |
Papilla elongated and pointed |
Round and blunt |
Fins |
Margins of dorsal, anal and Caudal fins rod, dorsal fin extends beyond the caudal peduncle |
Fins without red margins dorsal fin doesnot extend beyond the caudal peduncle |
Mouth |
Narrower |
Wider |
- Mature male and female are released in a cement cistern (1 m3) at a ratio of 1 : 3-4
- The male builds a nest (‘lek’) on the bottom and invite a female for mating.
- After spawning, the female collects fertilized eggs in her mouth and leaves the nest.
- The male invites another female for a similar act.
- Like-wise, one male can mate with several females within a short period.