The Auray-Vannes FLAG played a key role by supporting the application for CLLD funding and coordinating the project partners. This would in turn lead to more efficient spat collection and increased oyster production. This would allow them to analyse the changes in the oyster’s natural environment and work out the best time to collect the spat.
SEPRATING SINGLE OYSTER SPAT INSTALL
Hence, the Regional Shellfish Farming Committee of South Brittany submitted a project proposal to install a high-frequency multi-sensing buoy to gather data on these parameters. Studies carried out locally by the national marine research institute Ifremer linked environmental conditions, such as temperature and salinity, to oyster spawning, which directly impacts spat settlement quality and quantity. These oyster beds are most often situated in an intertidal zone. Over time, spat (oyster seed) settle on the empty oyster shells, maturing to a harvestable size. On-bottom traditional seed collection includes the spreading of cultch, recycled oyster shells, on the sea bed. Oyster spawning is becoming less predictable, which is making it harder to collect spat for cultivation. Oyster seed collection can occur in a variety of ways. We place the spat into fine mesh size bags, which we then place into the floating cages. We only buy from local shellfish nurseries, where we pick up our spat and bring them back to their new homes further down the coast. The wild oyster stocks, the main source of spat for breeding this species in captivity, are increasingly threatened by climate change and human action, which worsen water quality and give rise to large temperature fluctuations. We purchase tiny, individual baby oyster seed, called spat, when they are a quarter of an inch long. In France, the two main flat oyster collection areas are Brest Bay and Quiberon Bay, both in Brittany. From the summer of 2002 the Cawthron Institute will supply Pacific Oyster farmers with superior, hatchery reared, single seed spat. Once oyster larvae attach to a surface, such as other oyster shells, they are known as spat (shown in inset image).
This creates tiny larvae, which after 2-3 weeks grow legs and ‘settle’ by attaching themselves to a solid surface, where they are known as ‘spat’. Once oyster larvae permanently attach to a surface, they are known as spat.
Oysters breed by releasing their eggs and sperm into the water, where fertilisation takes place. currently takes place, and from experimental offshore sites, for both spat (R2 0.91.
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