微藻营养价值及其在水产生物营养强化中的应用

微藻营养丰富,易于大规模培养,生产成本低,投喂方便,而且能够净化调节养殖水体,作为鱼、虾、蟹、贝类等水产生物的饵料,具有无可替代的作用。本文就微藻中蛋白质、碳水化合物、脂类、色素、维生素和矿物质等主要营养成分的研究进展,以及微藻作为生物饵料在水产生物营养强化中的应用进行综述,以期为水产生物营养学研究与生物饵料的应用提供参考。      

Planktonic indicators of water quality: A case study in the Amacuzac River Basin (State of Morelos,Mexico)

Planktonic organisms are good indicators of water quality but are rarely used in Mexican riverine studies in spite of the high level of contamination in these lotic waters. In this study, we focused on the plankton of the river Amacuzac in Mexico and a large saline waterbody, Lake Tequisquitengo, which is located in the Amacuzac river basin. We collected samples at three sites in the River Amacuzac and one at Lake Tequisquitengo from May 2015 to March–April of 2016. We analysed the physicochemical variables, coliform bacteria, and biological oxygen demand levels. We also quantified phytoplankton and zooplankton. Our results indicate that the study sites are mesotrophic with high densities of diatoms and cyanobacteria. Among the zooplankton, the dominant organisms were rotifers. The constancy of planktonic taxa was high in the lake but low in the river. The Descy index ranged from 2.9 to 4.5 in the river and from 4.0 to 5.0 in the lake. The saprobic index shows that the system is β‐mesosaprobic. The species diversity was higher in the river than in the lake. Our study shows that plankton can efficiently be used to evaluate the water quality in rivers and lakes.