This data was collected at the Centre for Applied Marine Sciences as part of the REPROSEED Project. Data is presented as an Excel file in English. Data was gathered using a Leica DM E Compound Microscope. Data was analysed with Minitab statistical software.
Environmental and husbandry factors play key roles in the control of byssus attachment and detachment in many bivalve species. Identifying and understanding the impact of influential factors is essential for the management of post-settlement hatchery reared juveniles in species, such as the scallop Pecten maximus. We assessed the impact of substrate type and condition, attachment period and feeding ration, on attachment of juvenile scallops between 1.9 and 7.2mm in shell height. Comparison of a variety of substrates showed that scallop juveniles have a preference for textured hard surfaces, with mean attachment up to 75.6±14.4% after 24 hours on riven slate. Attachment could be significantly increased by pre-conditioning substrates in flow-through tanks of unfiltered seawater and by having undisturbed attachment periods longer than 1 hour. However, feeding ration (starvation, 0.025g, 0.05g and 0.15g organic weight of microalgae g-1 spat live weight week-1) had no impact on juvenile attachment. The effect of substrate type, substrate condition and feeding ration on retention of seed was assessed in a flume. For all substrates, retention decreased with increasing water velocity. However of the substrates examined (wool, nylon and slate), retention was greatest on the riven slate, with attachment up to 100% at water flow of 12.6±0.2 cm second-1. Pre-conditioning substrates by immersion in seawater for two weeks significantly compromised juvenile retention at higher water velocities. Feeding ration influenced retention, which was lowest in starved animals compared to all fed treatments, although not necessarily significantly, however feeding rations above 0.025g microalgae.g-1 juveniles.week-1 conveyed no additional benefit. Based on these findings, recommended parameters for maximising juvenile P. maximus attachment and retention in water velocities up to 12.6±0.2cm second-1 include utilising a riven slate type hard substrate, pre-conditioned for 1 week, with juveniles having been fed a diet of at least 0.025g microalgae.g-1 juveniles.week-1 and allowed to attach for 24 hours.
|Dyddiad y'i gwnaethpwyd ar gael||2019|
|Cyhoeddwr||Prifysgol Bangor University|
|Sylw tymhorol||Rhag 2012 - Maw 2013|
|Diwedd cynhyrchu data||Rhag 2012 - Maw 2013|