A mussel cultivation means 1 particularly for use in mussel spat collection. A plurality of flexible linear support means 2 on which mussels can grow are joined at intervals by rigid spacing means 3, typically plastic overmouldings. The invention also provides a vessel (8,Figure3) for harvesting mussels and a mussel collection system comprising both a harvesting vessel and mussel cultivation means. The harvesting vessel (8) may have two hulls, the linear supports 1 being winched aboard between the hulls. The mussels are removed from the supports 1 by a machine which has teeth to engage the rigid spacers 3. The supports may have a mesh (13,figure5) portion 13 between the rigid spacers 3.
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