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The Beatles were not too far off when they sang about an octopus’ garden. New research has determined that some fish have gardens, which they rigorously tend to and harvest.

According to a paper accepted for publication in the journal BMC Evolutionary Biology, the damselfish, Stegastes nigricans, maintains algae gardens. The fish and the algae each benefit from the arrangement.

Such beneficial relationships exemplify what scientists call “mutualism.” The latest discovery marks a very rare example of this in a marine environment.

See here for more: http://www.msnbc.msn.com/id/37778934/ns/technology_and_science-science

The Hawaiian Bobtail Squid, Euprymna scolopes, has a clever way of duping predators during its nightly activities.

It uses a symbiotic luminescent bacteria, Vibrio fischeri, to light up its underside, so that upwards-looking predators don’t see a dark, edible form silhouetted against a moonlit or starlit sky. Instead, hungry sharks or other fish see only sky. The squid is invisible.

See here for photos and more: http://www.underwatertimes.com/news.php?article_id=13748095621