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21.1.1. Interaction of different factors in the development process of bivalves
The developmental biology of bivalves is strongly dependent on many factors that are prevailing in their natural environment. Life and their growth in the natural environment are greatly influenced by the physical and chemical parameters of the living water and even minor changes will affect them. In general bivalves have many larval stages in their life cycle starting from Umbo stage to Plantigrade stage which will end with the settlement as spat. During this process they are depending on the following important factors: 1. Right quality of feed 2. Appropriate quantity 3. Salinity (35 - 37ppt) 4. Absence of pollutants 5. Absence of predators 6. Temperature (28 to 30 deg. C) 7. Fishing disturbances 8. Turbidity and water current 9. Availability of suitable substrates 10. No human activities By controlling the above in the breeding grounds the population of bivalves can be protected. |
Last modified: Saturday, 24 December 2011, 9:39 AM