sunbleak shoal camouflage color, silt sediment substrate, algae bloom, hornwort backlight aquascape, low visibility

leucaspius delineatus nutrient pollution eutrophication lake freshwater coldwater clearwater temperate underwater flora vegetation cyanobacteria driftwood plant summer organic particle water column balance vulnerable detritus ecosystem aquatic moderate climate season litter gravel shadow play human clear air bubble biotope impact scenery habitat destroy current dirty wildlife environment damage snorkel diving protect backlight ukraine ecotourism exploration high noise action camera