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
3.1.4. Factors responsible for breeding of fish in bundhs
Unit 3 - Breeding of major carps
3.1.4. Factors responsible for breeding of fish in bundhs
- Spawning may occur at night and during bright sun in the forenoon.
- After a period of breeding behaviour, mating occurs with vigorous splashing of water and a number of scales may get dislodged while some fish may even sustain minor injuries.
- After spawning is over, a thick blanket of eggs is left behind at the spawning site.
- The spent fish in bundhs move to the deeper areas.
- No single factors can probably be attributed to spawning of major carps in bundhs and rivers.
- The act of spawning involves the completion of a chain of interrelated pre-conditions.
- Heavy monsoon flood capable of inundating vast shallow areas is believed to be a primary factor responsible for spawning. Some workers believe the availability of shallow spawning ground to be a deciding factor for spawning. The rise in the level of water, naturally or artificially, is known to bring about spawning.
- The temperature of water for spawning is found to be between 22 and 33°C.
- Other factors like pH, high Dissolved Oxygen, alkalinity, chloride and minerals do not seem to play any significant role in spawning.
Soil type is not very important. - Spawning is inhibited due to the presence of hormone-like secretion in captive waters.
- Water that has flown through a dry bed of land rich in humus has stimulatory effect on spawning.
Last modified: Thursday, 9 June 2011, 8:50 AM