ISSN : 1225-3480
For the continuous stable production of oyster, estimation of food availability (F) was carried out in Goseong Bay, south of coast Korea. Primary productivity ranged from 0.07 to 0.44 gC/m2/day (average 0.25 gC/m2/day), lowest in July and highest in January. The distribution of primary productivity at Goseong Bay showed the pattern of “high in the south and low in the north.” Food availability (F) was F ≤ 0, indicating insufficient food supply, from August to November and F > 0 from January to April. Continuous insufficient food supply was observed at 18 oyster farms in the southern part of the bay and 4 in its northern part. Mortality at the oyster farms was 56% on the average, and around 58% of death occurred during November when food supply was insufficient. The optimal population of cultured oyster per unit flow area was calculated to be 110-115 indiv./m2 (198-201 indiv./string). When the sea area was divided into 3 regions (A, B, C) according to carrying capacity, the carrying capacity of (A) regions was 52-53 indiv./m2 (93-95 indiv./string), (B) regions was 142-144 indiv./m2 (255-259 indiv./string), and (C) regions was 198-202 indiv./m2 (356-363 indiv./string). In particular, (A) regions showed extremely low productivity. For continuous stable oyster farming at Goseong Bay, it is necessary to control point and non-point source pollution through continuous environmental monitoring and to adjust harvest according to the base carrying capacity during the season of high water temperature.
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