Why are the clams in Lake Hamana disappearing?

Why are the clams in Lake Hamana disappearing?

The catch of clams in Lake Hamana has been rapidly decreasing, and the reason for this is the change in water quality, feeding damage, and the deterioration of the habitat. This is believed to have prevented the growth of clams and led to a decline in their survival rate.

In addition, predators that prey on clams, such as the bluefin bream, are also having a serious impact on clams, and it has been reported that the population of bluefin bream has increased, increasing predation pressure on clams and resulting in a significant decrease in their population.

Hamamatsu Photonics, an optical equipment manufacturer, has begun researching plankton cultivation technology to promote the growth of juvenile clams by artificially supplying the plankton that the clams use as food. Hamamatsu City has announced a plan to strengthen comprehensive measures to create a habitat for clams by promoting the cultivation of artificial juvenile clams and eelgrass by 2025.

In addition, local fishermen have been spreading fertilizer in the lake to restore a habitat conducive to clams.

More information can be found at the following links

- [The problem of the decline of clams in Lake Hamana](https://wasabee.media/articles/3243313/?utm_source=chatgpt.com)
- [Hamamatsu City's Measures to Restore Resources](https://news.at-s.com/article/1646068?utm_source=chatgpt.com)
- Environmental restoration activities of local groups](https://newsdig.tbs.co.jp/articles/-/499049?utm_source=chatgpt.com)
- Video: The key to recovery of clams in Lake Hamanako](https://www.youtube.com/watch?pp=ygUTI-OCouOCteODqua9rueLqeOCig%3D%3D&v=77EYVpIeq1E&utm_source=chatgpt.com)