摘要
Biofouling is an important factor that affects the bivalve farming industry. Fouling organisms may reduce growth and survival rate of the cultured species. Fouler are often filter feeders, so they are potential competitors for food resource with the cul- tured species. The present study was conducted to measure the impact of fouling on food uptake and nutrient release in April and June, 2006 in Daya Bay near Guangzhou, China. Results showed that fouling organisms had significant effect on food uptake and nutrient release. The chlorophyll a uptake rate of fouled scallops was 7.53 Lh-1 ± 1.416 Lh-1 and 11.94 Lh-1± 2.497 Lh-1 in April and June, respectively, significantly higher than those of cleaned scallops, i.e., 4.23 Lh-1 ± 2.744 Lh-1 and 2.57 Lh-1 ± 1.832 Lh-1 respectively. The consumption of total particulate matter by fouled scallops in April and June was 5.52 Lh-1 ± 0.818 Lh-1 and 3.07 Lh-1 ± 0.971 Lh-1, respectively; the corresponding results for cleaned scallops are 2.49 Lh-1 ± 0.614 Lh-1 and 2.37 ± 1.214 Lh-1, respectively. Fouling in- creased ammonia release significantly. The ammonia release rate of fouled scallops was 33.81 Lh-1±7.699 Lh-1 and 76.39 Lh-1 ± 9.251 Lh-1 in April and June, while cleaned scallops released 2.46 Lh-1 ± 0.511 Lh-1 and 7.23 Lh-1 ± 1.026 Lh-1 ammonia, respectively. Phos- phate release of fouled scallops was 22.72 Lh-1 ± 9.978 Lh-1 in June and cleaned scallops released phosphate 6.01 Lh-1 ± 0.876 Lh-1 in April. Therefore, fouling contributed much to food reduction and concentration increase of ammonia and phosphate in water.
Biofouling is an important factor that affects the bivalve farming industry. Fouling organisms may reduce growth and survival rate of the cultured species. Fouler are often filter feeders, so they are potential competitors for food resource with the cul- tured species. The present study was conducted to measure the impact of fouling on food uptake and nutrient release in April and June, 2006 in Daya Bay near Guangzhou, China. Results showed that fouling organisms had significant effect on food uptake and nutrient release. The chlorophyll a uptake rate of fouled scallops was 7.53Lh^-1±1.416Lh^-1 and 11.94Lh^-1±2.497Lh^-1 in April and June, respectively, significantly higher than those of cleaned scallops, i.e., 4.23Lh^-1±2.744Lh^-1 and 2.57Lh^-1± 1.832Lh^-1 respectively The consumption of total particulate matter by fouled scallops in April and June was 5.52Lh^-1± 0.818Lh^-1 and 3.07 Lh^-1± 0.971 Lh^-1, respectively; the corresponding results for cleaned scallops are 2.49Lh^-1±0.614Lh^-1 and 2.37 ± 1.214 Lh^-1, respectively. Fouling increased ammonia release significantly. The ammonia release rate of fouled scallops was 33.81Lh^-1±7.699Lh^-1 and 76.39Lh^-1±9.251 Lh^-1 in April and June, while cleaned scallops released 2.46Lh^-1±0.511Lh^-1 and 7.23Lh^-1± 1.026Lh^-1 ammonia, respectively. Phosphate release of fouled scallops was 22.72Lh^-1 ± 9.978 Lh^-1 in June and cleaned scallops released phosphate 6.01 Lh^-1±0.876 Lh^-1 in April. Therefore, fouling contributed much to food reduction and concentration increase of ammonia and phosphate in water.
基金
supported by National Science Foundation of Huaihai Institute of Technology(No.KQ07102)
National Science Foundation of China(Grant Nos.30670401 and 40576052).
