- December 15, 2021
- Posted by: OptimizeIAS Team
- Category: DPN Topics
Subject – Environment
Context – CMFRI’s efforts to increase clam catch in Kerala’s Vembanad lake yield results
- Villoritacyprinoides, the black clam, is found in the backwaters of Kerala, mainly in Vembanad backwaters.
- It does not show sex reversal or hermaphroditism.
- It spawns twice a year.
- A change in salinity is the most important factor that triggers spawning, while temperature is not a factor.
- The optimum salinity for spawning is about 10–12 ppt.
To know about Vembanad lake, please refer November 2021 DPN.