trudy-russell's picture

Common starfish

Observed: 14th March 2009 By: trudy-russelltrudy-russell’s reputation in Invertebratestrudy-russell’s reputation in Invertebratestrudy-russell’s reputation in Invertebrates
small-2
Description:

five armed starfish, orange colouration

Identifications
Species interactions

No interactions present.

Species with which Common starfish (Asterias rubens) interacts

Comments

jason.birt's picture

Aggregation

Common starfish aggregate during the spring, most likely to spawn. Spawning is initiated - possibly by chemicals in the phytoplankton bloom - and they develop a characteristic spawning position: up on the tips of their legs as they extrude the eggs or sperm into the current. For many starfish and sea urchins, although not necessarily this species, detection of pheromones within the spawn will trigger them to spawn, causing a "wave" of reproduction.

Jason Birt