Design a flow through system oyster spat
Too little flow results in supply failure, while flow exceeding 2 cm/sec inhibits searching and attachment behaviors. Table 1: Protocol for rearing pearl oyster larvae in flow-through system. Comparisons of mat, bag, and orientation results suggest that optimal current range for settlement is between 0.3 and 2.0 cm/sec. assessment of pearl oyster stocks and spat set. The highest settlement occurred with open mats on surfaces oriented horizontally and facing downward. Sticks are spaced 1520cm apart and then fixed to the racks. The sticks used for spat collection are separated and laid out more extensively onto the racks.
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Examination of flow rates and patterns suggests that water movement over W:D 5 treatments delivers larvae to the settlement surface, but active attachment behavior is required to explain W:D 5's higher settlement densities relative to W:D 2. This method involves keeping the sticks used for spat collection, removing excessive spat and leaving the remaining oysters to mature. Results indicate that concavity can affect settlement success (W:D ratio of 5 resulted in the highest settlement success under this study's conditions). In addition, settlement on oyster shell cultch presented in different surface orientations, and either zip-tied to open mats, or packed in mesh bags, was examined. Active settlement, passive settlement, and flow around these concavity treatments were examined.
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#Design a flow through system oyster spat plus#
Concavities tested include W:D ratios of 2, 5, and 16, plus a flat surface for control comparisons. While some variables can be acceptable, others cannot be compromised. Experiments were conducted in 204-l capacity laboratory flumes. Location factors to be considered during system design include proximity to water, quality of local water, sturdiness of dock structures, permits required and access for delivering and preparing cultch and loading the planting vessel with the seed.
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To examine the role of substratum concavity in determining oyster settlement success, laboratory settlement was examined on natural and artificial substrata of various concavities, defined by width-to-depth (W:D) ratio.