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Strange Fish Behaviour

Home Forums Fresh and Brackish Water Fishes Strange Fish Behaviour

This topic contains 0 replies, has 1 voice, and was last updated by  Saxodave 8 years, 2 months ago.

Viewing 13 posts - 1 through 13 (of 13 total)
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  • #301552

    Saxodave
    Participant

    Don’t know if this is usual behaviour or not but one of my Vietnamese M-B Loaches has decided to attach itself to the gill/eye area of one of the Harlequins in my tank and stay attached while the the poor Harlequin swims manically, swerving and diving, trying to remove the unwanted hitchhiker! What is going on? There doesn’t appear to be any damage to the Harlequin but it must get highly stressed.

    #344471

    Graham Ramsay
    Participant

    Their specific name means ‘tormentor’ or something like that. Mine seem peaceful enough mind.

    #344472

    Matt
    Keymaster

    Very odd.

    #344474

    Bully
    Participant

    What do you mean by attach?

    Does it swim alongside it very closely, or does it latch on with it’s mouth? The behaviour of swimming really closely to another fish is not uncommon with loaches, it is quite often known as “shadowing”.

    #344490

    Saxodave
    Participant

    Yes Matt they are Yunnanilus cruciatus and in reply to Bully, it would appear that the fish in question is attaching itself to the Harlequin by its gill or eye area. If it is ‘shadowing’ it is doing an incredibly good job considering the contortions the harlequin performs to try to get away from it.

    #344492

    Bully
    Participant

    If it’s not attaching by biting onto the fish then I can only say that it is shadowing. Loaches are very adept at it, they seriously look as though they are stuck to the fish.

    #344493

    Saxodave
    Participant

    Maybe that is what it is doing then. I wonder what it hopes to gain from this behaviour? It’s quite distressing to watch.

    #344494

    Bully
    Participant

    How many of that species of loach do you have?

    #344496

    Matt
    Keymaster

    Very interesting – I was under the impression that behaviour was restricted to botiids.

    #344499

    Bully
    Participant

    I know that I have read somewhere else another case of Y. cruciatus shadowing fish, for the life of me I cannot remember (or find) where.

    #344508

    Saxodave
    Participant

    I have three Y. cruciatus but it would appear that only one of them is acting in this way.

    #344510

    Bully
    Participant

    My advice would be to increase the size of the loach group if your tank permits it. These fish are highly social and need larger groups to display natural behaviour. It may not stop that particular loach from exhibiting the behaviour but, I’m willing to bet that it will drastically reduce with a larger group of loaches in the tank.

    #344511

    Saxodave
    Participant

    Thanks Bully. I need to assess my stocking level to see if I can add some more fish as soon as possible.

Viewing 13 posts - 1 through 13 (of 13 total)

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