Trigger Fish & Dorsal Spine?

Discussion in 'Tropical Fish' started by BobGeorge, Aug 28, 2011.

to remove this notice and enjoy 3reef content with less ads. 3reef membership is free.

  1. BobGeorge

    BobGeorge Astrea Snail

    Joined:
    May 16, 2011
    Messages:
    60
    Location:
    Woodbridge, Virginia, United States
    I have a Niger & Humu trigger & occasionally they put up there top dorsal spine. Normally they do it when they are just swimming around a lone & not around other fish.

    Is this a sign of aggression?
     
    BobGeorge, Aug 28, 2011
    BobGeorge, Aug 28, 2011
    #1

    2. Click Here!

  2. thepanfish

    thepanfish Flying Squid

    Joined:
    Jan 1, 2010
    Messages:
    3,014
    Location:
    Michigan
    The first dorsal spine is usually used by triggerfish to keep predators from pulling them out of rock caves. Some fish will just stretch occasionally (anecdotal) which is probably what ypurs are doing.
     
    thepanfish, Aug 28, 2011
    thepanfish, Aug 28, 2011
    #2
  3. Jva

    Jva Astrea Snail

    Joined:
    Jun 29, 2008
    Messages:
    62
    Location:
    Pennsylvania
    My trigger would do that quite often. I believe it is simply stretching when it does that.
     
    Jva, Aug 30, 2011
    Jva, Aug 30, 2011
    #3