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Tumbling and Sorting Oysters

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TUMBLING AND SORTING<br />

By<br />

Greg Bates<br />

Kachemak Bay


WHY TUMBLE AND SORT?<br />

• Grade out biofouling<br />

• Better growth<br />

• Cull small oysters <strong>and</strong><br />

shell<br />

• Better product<br />

• Easier to h<strong>and</strong> sort


TUMBLER


CAGES AND TUMBLER GO<br />

HAND IN HAND


HELP MAKE<br />

BETTER PRODUCT<br />

• Round oysters<br />

• Create a deeper cup<br />

• Create a harder oyster with a better shelf life<br />

• Minimize doubles


THE PROCESS OF TUMBLING<br />

• Dump tray directly<br />

into tumbler<br />

• Break apart<br />

doubles by h<strong>and</strong><br />

• Remove any shell


• Sorted crop<br />

• Free of<br />

biofouling<br />

• Ready to go<br />

back directly<br />

into cages<br />

RESULTS


• Self Dumper<br />

• Longer tumble<br />

IMPROVEMENTS<br />

Jim Aguiar mechanization<br />

Lifter Hopper<br />

Tumbler/<br />

Washer<br />

Conveyor<br />

<strong>Sorting</strong><br />

Table


SORTING DURING NURSERY<br />

• Key to sort oysters<br />

to get a uniform<br />

crop<br />

• Better growth in<br />

nursery through<br />

sorting<br />

• Helps create a<br />

better oyster<br />

PHASE


MODIFIED ONION SORTER<br />

• Sieves with round,<br />

not square holes<br />

• Shakes oysters<br />

with a strong<br />

vibration


FAST METHOD TO SORT SMALL<br />

• 2 people can sort<br />

about 1 million<br />

(10-25mm)<br />

oysters per day<br />

OYSTERS


DRAWBACKS TO SORTING AND<br />

TUMBLING<br />

• Need to let oysters recover before<br />

harvesting<br />

• Lots of Cuts- harder to keep<br />

inventories<br />

• Requires Labor <strong>and</strong> equipment


CONCLUSION<br />

• Better growth<br />

• May reduce gear<br />

• Culls small oysters<br />

• Controls biofouling<br />

• Faster than h<strong>and</strong> sorting<br />

• Better product


NURSERY PHASE BENEFITS<br />

• Uniformity<br />

• Single oyster<br />

• Desirable shaped shell<br />

• Ready for planting.<br />

• Growth

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