- Stegastes nigricans
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Stegastes nigricans 
Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Perciformes Family: Pomacentridae Genus: Stegastes Species: S. nigricans Binomial name Stegastes nigricans
(Lacépède, 1802)Stegastes nigricans or dusky farmerfish is a species of damselfish found around coral reefs at a depth of 1 to 12 meters.
S. nigricans practices a form of agriculture with a species of red algae. The fish will claim a patch of "brown carpet algae" which it defends by chasing away other fish and sea urchins. The fish also pulls up other bits of algae that attempt to grow in the patch and swims outside of its territory to spit the invading algae out. When the fish claiming a patch is removed, the patch is eaten up within a few days. When a patch of the brown carpet algae is caged to keep both S. nigricans and other fish out of the patch, other species of algae quickly overwhelm the patch. This seems to indicate that the brown carpet algae is dependent on S. nigricans for its survival.[1]
References
- ^ Hata, Hiroki; Kato, Makoto (December 22 2006). "A novel obligate cultivation mutualism between damselfish and Polysiphonia algae". Biology Letters 2 (4): 593–6. doi:10.1098/rsbl.2006.0528. PMC 1833977. PMID 17148297. http://www.journals.royalsoc.ac.uk/openurl.asp?genre=article&doi=10.1098/rsbl.2006.0528. Retrieved 2007-01-15.
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