microbiology

2. • Phenomenon of production and emission of light by an
organism through chemical reaction.
• chemical energy Light energy
• Bioluminescent animals
Are mostly - marine
Very few - terrestrial

3. Marine Terrestrial

4. Bacterial Intrinsic

5. 1. Photobacterium luciferum
2. Vibrio fischerie / harveyi / phosphoreum
How do they look like?
- Typically curved rods 1 to 3 microns long and motile by
flagella
Where are they found?
- Can be found in Seawater (1 to 100 cells per ml),
fish digestive tracts, and on the outside of decaying fish

6. • by a chemical reaction that consumes oxygen
• the reaction is catalyzed by an enzyme called luciferase
• Bioluminescence: Not found in freshwater organisms.

7. -Light is only produced when the organisms are present at
high cell densities

8. • Light producing organ

9. - organ open to exterior (provide entrance for bacteria to
enter)
- potentially continuous luminescence

10. • Squid Euprymna- squid hatches without bacteria; within
hours it is infected with natural populations of bacteria

11. Pinecone Fish Anglerfish flashlightfish
ponyfish

12. Some predators can lure prey by mimicking
signals of prey. Other predators dangle a lure to
attract prey.
Finding or attracting prey

13. • mid-water squid releases a bioluminescent cloud to
startle and confuse predators

14. squids- looking for mates
Attract opposite sex.

15. Other bioluminescent animals
pterapods