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  1. #1

    Join Date
    Feb 2010
    Ypsilanti, Michigan

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    Default Symptoms of temporary temperature shock?

    0 Not allowed!
    Continuing to brainstorm issues related to my sudden loss of loaches. I need to know more about temperature shock.

    I know that sudden exposure to very cold water is instantly fatal to most tropical fish, hence icewater being commonly used for euthanasia [although I've also seen that that may not be as quick and painless as we'd like to think].

    I also know that a gradual drop in temperature, such as when a house loses power or a heater quits working, stresses the fish and makes it at risk for other issues, like ich.

    But what would happen if a fish went through some temporary but rapid temperature changes? Like, say, one moment the fish is in 78 degree water, then the next moment its in 60 degree water, and then after that it's back in 78 degree water? What sorts of behaviors or symptoms would you expect from the fish?
    300 gallon mega tank: sailfin pleco, clown loaches, silver dollars, roseline sharks, congo tetras
    75 gallon community tank: black skirt tetras, danios, bronze corys, harlequin rasboras, otos, bristlenose and bulldog plecos, assassin snails, red cherry shrimp, bamboo shrimp
    60 gallon goldfish tank: fancy goldfish

  2. #2


    0 Not allowed!
    i think the thing to look at is something like this:

    you don't change 100% of the water, so the new water you add is diluted to the 78deg temp water.
    I measure the temp from new water with my hand (so i'm assuming i'm always a few degree's off)
    but when i add in 50% of new water that is colder (lets use your #'s) at 60degrees
    then technically the swing isn't 18 degree's they go through. it's more like 9 b/c of the dilution.

    (and this is all in the assumption that your heater is off during the pwc)

    but regardless, the behaviors i would expect are just a shocked fish-something of the sorts where they are shy/hidden and not too active, little change in color.

    but after a few minutes they are back to normal.

    i believe temp changes can stress fish and massive ones can kill them. but i also believe that temp changes happen in nature, the sun makes the water warm, and at night i bet it gets fairly chilly.

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