Spawn and mating events in Philinopsis cyanea


All the photos shown on this page were taken in December 2010 on a large population (20 and 30 specimens of different sizes, from 10 to 90 mm) living in a permanent pool of the rocky coast of Etang Salé les Bains

By Christophe Cadet


Courtship behavior 1 :

Both specimens come face to face ( a), circling ( b ), as observed in a fight, make a full turn to come face-to-tail ( c )

Reunion, Etang salé les bains, less 1 m, 14 December 2010, 11h57 to 12h00, size : 60-70 mm (length : 3 minutes)

 


Courtship behavior 2 :

One of them grabs the other behind the cephalic shield ( a ) and drags (b and c) on the side or back of another specimen .

The lateral parapodia are loose, at times revealing the gills ( c )

Reunion, Etang salé les bains, less 1 m, 14 December 2010, 11h57 to 12h00, size : 60-70 mm (length : 3 minutes)


Mating behavior 3 :

After a few minutes, the two individuals recovering head to tail and begins copulation.

During this phase, a cylinder of mucus is secreted

I could not observe when the two individuals separate

Reunion, Etang salé les bains, less 1 m, 14 December 2010, 12h00, size : 60-70 mm

 



Spawning behavior :
specimen 1

Réunion, Etang salé les bains, less 1 m, 5 December 2010, 21h15-22h00, size : 55 mm

45 minutes : The spawn is not over ...

During this period, Christophe Cadet observed fifty spawns on the sandy substrate of this permanent pool

Most spawns have occurred at night ( only a few during the day )


Spawning behavior :
specimen 2

Réunion, Etang salé les bains, less 1 m, 14 December 2010, 12h05 to 12h37, size : 30 mm

32 minutes : The spawn is over ...