Method for stopping swimming or crawling of adhesion-stage larvae

1. A method of stopping a larva of Pteriomorphia in a settlement stage from swimming or crawling in water, comprising the step of:

irradiating light consisting of a part of a spectrum of 400 nm to 440 nm to the larva in the settlement stage, wherein the light irradiating the larva in the settlement stage has a peak wavelength in a range between 409 nm and 412 nm.

2. The method according to claim 1 , wherein the light to the larvae in the settlement stage has a spectral irradiance of 59.4 μWcm −2 nm −1 or higher in a wavelength range between 409 nm and 412 nm.

3. The method according to claim 2 , wherein the light is not a laser beam.

4. The method according to claim 1 , wherein the part of the spectrum consists of a part of a spectrum of 400 nm to 420 nm.

5. The method according to claim 4 , wherein the light is not a laser beam.

6. The method according to claim 1 , wherein the light is not a laser beam.

7. The method according to claim 1 , wherein the light is an LED beam.

8. The method according to claim 7 , wherein the light is not a laser beam.

9. The method according to claim 1 , wherein the water is seawater.

10. The method according to claim 9 , wherein the light is not a laser beam.

11. The method according to claim 1 , wherein the sessile invertebrate is a mussel or an oyster.

12. The method according to claim 11 , wherein the light is not a laser beam.

13. The method according to claim 1 , wherein the larva in the settlement stage is a pediveliger of Mytilus galloprovincialis or Crassostrea gigas.

14. The method according to claim 13 , wherein the light is not a laser beam.

15. The method according to claim 1 , wherein the part of the spectrum consists of a spectrum of 400 nm to 420 nm.