Author(s): Suiliang Huang, Min Wu, Changjuan Zang, Shenglan Du, Wenwen Kong, Yao Xiao, Joseph Domagalski, Magdalena Gajewska, Adam Szymkiewicz, Romuald Szymkiewicz
Linked Author(s): Suiliang Huang
Keywords: Algae, bighead carp (aristichthis nobilis), common carp (cyprinus carpio), experimental enclosure, growth dynamics
Abstract: The present study of the drinking water supply source, Panjiakou Reservoir (Hebei Province, China), provides an illustration of the potential link among fish food, algal biomass and structure, and two different fishes. Five polythene enclosures were installed near the fish aquaculture cages in this reservoir. This paper focuses on algae including their growth dynamics and community structure alteration. Results from approximately 50 days� observation indicated that the introduction of fish food greatly encouraged a blue-green and green algae outburst, and that the presence of bighead carp (aristichthis nobilis) and common carp (cyprinus carpio) can be reduced up to 79. 47% and 65. 22 % of the total algae biomass, respectively, as compared to the enclosure only with fish food. Moreover, culturing two kinds of fish changed the algae dominance from the larger blue-green algae to smaller green algae. Algae species dominance analysis indicated that the introduction of fish food reduced the diversity of the phytoplankton community, and Anabaena developed to be the single predominant species. Fish species impacted significantly on the dominance of algae species. The suppression of Anabaena by the bighead carp (aristichthis nobilis) contributed greatly to the decline of the blue-green algae biomass. The reduction in nutrient availability owing to the abundant food utilization by common carp (cyprinus carpio) and the regulation of phytoplankton composition caused the dominance of Vlothrix sp and Coelastrum in the common carp (cyprinus carpio) culturing enclosure. Further statistical analysis showed that the chemical oxygen demand (COD) and water temperature were positively and negatively related to the total algae biomass, respectively
Year: 2017