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ISSN : 1225-3480
축제식 양식어장에서 홍합 치패의 중간육성 가능성을 확인하기 위해 2014년 9월부터 2015년 4월까지 홍합 치패의 성장과 생존율을 측정하였다. 또한 수온, 염분, 용존산소, pH, 용존무기질소 (DIN), 용존무기인 (DIP), 엽록소-a 및 식물플랑크톤의 현존량을 동시에 분석하였다. 수온과 염분의 범위는 각각 <TEX>$4.0-23.4^{\circ}C$</TEX>, 18.8-25.2 psu 로써, 일반적으로 보고된 적정 수준보다 낮았다. 매월 측정된 홍합 치패의 생존율은 모든 실험구에서 90% 이상을 기록하였다. 엽록소-a 농도와 식물플랑크톤의 현존량은 높게 나타났고, 주요 우점종은 은편모류와 미소편모류이었다. 이들 우점종은 이매패류 유생의 좋은 먹이가 될 것으로 판단된다. 축제식 양식어장의 저층에 채롱 당 100 개체(<TEX>$2,700ind.\;m^{-2}$</TEX>) 의 밀도로 수용한 실험구에서 가장 높은 성장 (<TEX>$7.63{\pm}4.65mm$</TEX>) 을 보였으나, 채롱 당 200 개체 (5,400 개체 <TEX>$m^{-2}$</TEX>) 이하를 수용한 실험구 간에는 유의적인 차이가 없었다. 적절한 관리가 이루어진다면 축제식 양식어장은 이매패류 치패의 중간 육성을 위한 대안적 어장이라고 판단된다.
Growth and survival of the hard shelled mussel spat were investigated to confirm the possibe spat culture in seawater pond from September 2014 to April 2015. Also, we measured simultaneously environmental factors including water temperature, salinity, dissolved oxygen, pH, DIN, DIP, chlorophyll a, and abundance and dominant species of phytoplankton in seawater pond every month. Ranges of water temperature and salinity were 4.0-23.4℃ and 18.8-25.2 psu, respectively, which were rather lower than the reported optimal level. Monthly measured survival rates in all the spat cages were over 90%. Concentration of chlorophyll-a and abundance of phytoplankton were very high, and dominant species phytoplankton were cryptomonads and nanoflagellates. These dominant species were considered to be good food organisms for the bivalve spat. The experimental cage stocked 100 individuals per basket (2,700 ind. m-2) hanging in bottom of seawater pond revealed the highest growth in shell height (7.63 ± 4.65 mm), but all experimental cages stocked below 200 individuals per basket (5,400 ind. m-2) did not show statistically significant difference. We may expect that seawater pond would be one of the best culture ground for bivalve spats when appropriate measures are available.
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