kai :
“The janitor fish, officially called the suckermouth catfish (Hypostomus plecostomus), is also commonly known as the pleco or armored catfish. Here’s a quick and casual rundown about them:
Why are they called ‘janitor fish’?
Because their mouths work like super strong suction cups. They stick to aquarium glass or rocks and eat algae, moss, and leftover fish food, so they help keep fish tanks clean.
Pros and cons of keeping them in aquariums
Pros:
Great at cleaning algae off the tank walls
Extremely hardy and easy to keep
Cons:
They produce a lot of waste: they eat a lot and poop a lot, which can actually put more pressure on the filtration system.
Can become aggressive: when they grow larger or don’t get enough food, they may suck the slime coat off weaker fish, causing injuries or infections.
They grow huge: babies are tiny, but adults can reach 30–50 cm, which is way too big for most home aquariums.
Serious ecological problems
Plecos are considered a highly destructive invasive species:
Almost no natural predators: their bodies are covered in hard bony plates like armor, so most predators can’t eat them.
They damage ecosystems: in rivers and streams, they eat the eggs of native fish, which can lead to declines or even local extinction of native species.
Extremely tough survivors: they can tolerate low oxygen levels and heavily polluted water, and can even survive out of water for a while.
Can people eat them?
Technically yes, but in most parts of Taiwan and China it’s not recommended:
Bad texture: too many bones, rough meat, and a strong muddy/fishy smell.
Health risks: they often live in polluted drainage canals or contaminated waters, so they may accumulate heavy metals, toxins, and parasites.
In Taiwan and China, plecos are an invasive species, so videos of people killing them are generally seen as helping protect the environment rather than harming wildlife.”
2026-05-07 09:24:21