Yes, it can. It can clog their gills, making their feeding less efficient, or interfere with their reproduction through chemicals that leach from the plastic particles. Source: I study bivalves
Ohh for sure, we can do that, you want just “AAAAAAAAAAAAAAAAAAARRRRHRHRHRHHHHHHHHHHHHHH” type of basic scream or you want it to go into specific details on where and how it hurts?
Both at the right decibel to not cause pain to the human listener, but loud enough to be heard at a distance.
Oysters actually need clean/unpolluted water. What they eat and clean is sediment, phytonutrients, and phytoplankton. Well at least that’s what I was tood by an oyster farmer. They clear the water which is good for the sea grass, and the small fish, which is good for the big fish and so on.
They are confirmed to be able to gather nano-plastics as larvae, and microplastic as adults, though no studies have looked at nanoscale particles in adult oysters from what I could find. They may ingest the plastic or package it up in mucus to expel as “pseudofeces”, trapping the plastic particles in the sediment. Source: I study bivalves
You can offset that by changing the feeding schedule. Just replenish the tank with gray water every other day instead of daily and you should be fine with only four.
Hard to say without knowing its composition. If rich in ammonium, the nitrification (oxidation to nitrate) might lead to lower alkalinity. If rich in nitrate, it might help alkalinity, but only if there’s some lower oxygen area of the tank like a bank of sediment, where denitrification can happen
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