There have been a large number of dead starfish washed up on Shoreham Beach. The general consensus is that it is due to inshore spawning.
As with many animals that gather and reproduce/spawn on mass this often leaves Looking at my past records, the starfish mass strandings seem to be around this time of the year - and starfish do spawn in the spring (some may spawn in the summer). Not all starfish gather in very large groups, I guess it may depend on the biomass of starfish in that area. They need to be relatively close to each other as reproduction is external.
Dead shore crab with eggs (pictures by Jackie, Friends of Shoreham Beach)
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