A COMPARATIVE STUDY OF GROWTH BETWEEN A HAWAIIAN OYSTER, Dendostrea sandvichensis (G. B. Sowerby II, 1871), AND PACIFIC OYSTERS, Crassostrea gigas (Thunberg, 1793)
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Clem, Jacqueline
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Aquaculture in Hawaiʻi has played an essential role in supplying local populations with the food needed to thrive. In particular, the traditional Hawaiian fishponds (loko i’a) have historically been highly productive resources that help fill this necessity. In recent years, the stewards of Hawaiian fishponds have aimed to return to their roots of providing food for surrounding communities, improving the overall quality of the ponds, and re-establishing native species populations. The managers of Heʻeia fishpond are working to accomplish all three goals through producing a native oyster, Dendostrea sandvichensis, and the Pacific oyster, Crassostrea gigas. However, a challenge this pond faces is spat mortality, which is often the result of predation, a lack of food, or other environmental stressors. The intent of this research was to test the use of a floating upwelling system (FLUPSY) since this is the primary method of rearing juvenile oysters in open water. Having a FLUPSY designed specifically for local conditions would allow fishpond operators to achieve their goals faster and with greater success. The production of oysters can allow Heʻeia fishpond to filter water, re-establish the native oyster populations, allow for sales to other producers, and provide an additional food source for the community. The results of this study show that both the D. sandvichensis and C. gigas spat grow significantly quicker in a FLUPSY than they would if they were grown using a more typical method, which is via hanging cages. These results underscore the advantages of utilizing a FLUPSY, even in small-scale oyster farming operations. Moreover, they pave the way for other local ponds to consider adopting similar devices in order to engage in efficient oyster production.
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Clem, Jacqueline
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