Why does the color of seawater change with the weather?

If it is not a visual error, if it is a small aquaculture water body, the algae phase of the water body may be unstable due to different weather, light, temperature and other reasons, and the water body with different algae phases presents different colors. On rainy days, it is a natural phenomenon that the dissolved oxygen in the water body is insufficient and the light is insufficient, and the phenomenon of "algae falling" appears, and the water becomes turbid. Second, in continuous rainy days, the bottom organic matter ferments and bottoms out, and some organic debris may lead to water mixing. Thirdly, some zooplankton, such as cladocera copepods, eat some dead algae and organic debris at the bottom of the pond and move at the bottom, stirring some mud or organic debris at the bottom, leading to mixed water. On sunny days, algae multiply in large numbers and produce oxygen through photosynthesis, so the water body is not short of oxygen. In addition, some fungi can decompose organic debris in water under suitable conditions, and the water body can recover its self-purification ability. Generally, water that is not too fat looks natural and clear. My humble opinion, please advise.