You may be looking for the word "Algae" That is the stuff that "Blooms" then decays and poisons the water which causes fish kills.
algae
One of the most notorious toxic blooms that can kill fish is caused by cyanobacteria, commonly known as blue-green algae. These blooms can produce harmful toxins, such as microcystins, which can lead to fish kills by disrupting their respiratory systems and harming their gills. Environmental factors like nutrient runoff, warm temperatures, and stagnant waters contribute to the proliferation of these blooms. When conditions are right, these toxins can quickly accumulate in water bodies, posing significant risks to aquatic life and ecosystems.
A harmful algal bloom (HAB) caused by dinoflagellates that leads to fish kills is commonly referred to as a red tide. Dinoflagellates produce toxins that can affect marine life, including fish, by disrupting their nervous system and causing respiratory distress, ultimately leading to fish kills. Monitoring and managing red tides are essential to protect marine ecosystems and public health.
An algal bloom can cause harm to a body of water by depleting oxygen levels, blocking sunlight from reaching other aquatic plants, and releasing toxins that may be harmful to fish and other organisms. This can disrupt the ecosystem, leading to fish kills and impacting water quality.
Algal blooms can be deadlier than plankton blooms, particularly when they involve harmful algal species that produce toxins, such as cyanobacteria or dinoflagellates. These toxins can lead to fish kills, contaminate drinking water, and pose health risks to humans and wildlife. While plankton blooms can disrupt ecosystems and food webs, they are generally less harmful than toxic algal blooms. The severity of each type of bloom depends on various environmental factors and the specific species involved.
Some what, yes other reasons are possibly people are dumping toxic wast into the water witch kills the fish, or there is too much fishing in one area.
The affect on redtide is it kills many fish and contaminate shell fish such as clams, mussels, which eat the algae and then poison the other organisms that eat them. Such as fish, marine birds and even humans. The algal bloom also reduces oxygen levels in the water, which further contribute to fish kill.
Excessive organic matter, especially decaying matter, can build up to toxic levels and kills freshwater fish. An example would be uneaten food or feces breaking down.
Phyllum is not used itself ,but members of this Phyllum are much important in producing red tides and bloom in sea as in red sea . These blooms are toxic to fish and other organisms+
Anything described as toxic would by definition be capable of causing death.
it kills animals in the water.
Yes, formalin kills fish.