In 2009 huge quantities of sea lettuce seaweed (Ulva lactuca) washed up on the beach at Saint Michel. Poisonous gases resulting from its decomposition caused the death of a horse[3] and may have been a factor in the earlier death of a cleanup crew truck driver.[4]
The bay at Saint-Michel-en-Grève
Sunset over the Lieue-de-Grève
Population
Historical population
Year
Pop.
±%
1962
363
—
1968
372
+2.5%
1975
382
+2.7%
1982
398
+4.2%
1990
376
−5.5%
1999
405
+7.7%
2008
483
+19.3%
2013
461
−4.6%
2016
453
−1.7%
Inhabitants of Saint-Michel-en-Grève are called michelois in French.