부영양화 호소수에 대한 국내 서식 펄조개(A. woodiana)의 유기물 제어 실험 결과, 펄조개 30개체를 대상으로 패각 크기 4.3~15.5 cm (평균 9.54 cm)에 따른 유기물 여과율은 $0.08{sim}0.86L;g^{-1};h^{-1}$, 단위 건중량당 펄조개의 여과율은 $0.09L;g^{-1};h^{-1}$를 나타내었다. 펄조개의 배설물 생산량 (PF)은 $0.00{sim}11.10mg;g^{-1};h^{-1}$, 단위 건 중량당 배설물 생산량은 $0.37mg;g^{-1};h^{-1}$를 나타내었다. 또한, 클로로필-a와 부유물질 제거율(RA, %)은 느린 유속에서 82.1%, 71.0% 빠른 유속에서는 65.4%, 57.5%의 제거율을 나타냈고, 반응표면분석 결과, 패각 크기는 14.3~15.6 cm, 유속은 $22{sim}30Lh^{-1}$ 구간에서 여과율 $6.21L;mussel^{-1};d^{-1}$의 최적값을 나타내었다. 또한, 배설물 생산능은 패각 크기는 14.3~16.3 cm, 유속은 $36{sim}44Lh^{-1}$ 구간에서 배설물 생산이 $4.2mg;g^{-1};d^{-1}$의 최적값을 나타내었다.
This study was conducted to establish models of filtrating rate and production of feces of a native freshwater bivalve, Anodonta woodiana, on removal organic matters in eutrophic waters. Among the applied shell size (4.3~15.5 cm), the filtrating rate and production of feces of Anodonta woodiana was $0.08{sim}0.86L;g^{-1};h^{-1}$ (average $0.24L;g^{-1};h^{-1}$), $0.00{sim}11.10mg;g^{-1};h^{-1}$ (average $0.94mg;g^{-1};h^{-1}$), respectively. In two different water current (high $48Lh^{-1}$, low $24Lh^{-1}$), the filtrating rate of Chl-a was $0.02{sim}0.10L;g^{-1};d^{-1}$ (average $0.05L;g^{-1};d^{-1}$), $0.02{sim}0.11L;g^{-1};d^{-1}$ (average $0.07L;g^{-1};d^{-1}$) and the removal rate was 65.4%, 82.1%, respectively. Response surface methodology, with a central composite design comprising 3 levels and 2 variables, was used to identify the optimal removal condition of shell length, water current and filtrating rate or feces production by bivalves. The optimum removal conditions were found that had optimized $6.21L;mussel^{-1};d^{-1}$ at shell length 14.3~15.6 and water current $22{sim}30Lh^{-1}$. The optimal conditions of production of feces ($4.2mg;g^{-1};d^{-1}$) by freshwater mussels were shell length 14.3~16.3 cm and water current $36{sim}44Lh^{-1}$.
