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The pelagic animal game

Discussion in 'Name that Critter' started by smellzlikefish, May 24, 2015.

  1. smellzlikefish

    smellzlikefish Marine Scientist

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    Let's try another one:

    Coryphaena sp 4 small watermarked.jpg
     
  2. Scuba_Jenny

    Scuba_Jenny dirty-finned dive goddess ScubaBoard Supporter

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    mahi mahi?
     
    Full Circle likes this.
  3. smellzlikefish

    smellzlikefish Marine Scientist

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    Yup! Mahi (Coryphaena hippurus) are one of the fastest growing fish species out there.

    That was easy, try this one:

    Stomiid watermarked.jpg
     
  4. Scuba_Jenny

    Scuba_Jenny dirty-finned dive goddess ScubaBoard Supporter

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    I want to say a file fish, but probably more like a pompano or jack
     
  5. smellzlikefish

    smellzlikefish Marine Scientist

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    The extruded gut is the key here, present in neither Carangids nor Monocanthids. Keep trying!
     
  6. Scuba_Jenny

    Scuba_Jenny dirty-finned dive goddess ScubaBoard Supporter

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    On a thread on FB, a similar photo was posted and one of the comments was :

    that mimicry thing is likely "fake" mimicry, something humans notice that isn't purposeful- usually a fish does NOT want to look like a smaller fish that would attract predators. Note that the silver protects the brain and viscera from UV light, and the opaque cover of the gut prevents luminescence of prey attracting predators. Many larval fishes have black or silver coverings of the cranium and gut, just not stretched out like this.

    Interesting... yes, animals are weird.. freaking awesome..
     
  7. smellzlikefish

    smellzlikefish Marine Scientist

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    Interesting concept. Evolution does not have a defined "purpose," but instead just kind of stumbles around until something works and gets passed on to the next generation. The mimicry here was actually pointed out by a couple of larval fish experts at the Smithsonian, but the advantages you point out are certainly valid. I'll send your thoughts along and see how they react.

    The most recent post was a larval Astronesthes, or snaggletooth, in the family Stomiidae. As an adult, this animal will live in mesopelagic (midwater) and develop a barbel under its chin that acts as a sort of lure.
     
    vincent54 likes this.
  8. smellzlikefish

    smellzlikefish Marine Scientist

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    The last one was a larval Stomiid (dragonfish) in the family Astronesthes (snaggetooths).

    This next one is probably one of the most common pelagic animals we see.
    Physonect siphonophore 2 watermarked.jpg
     
  9. Scuba_Jenny

    Scuba_Jenny dirty-finned dive goddess ScubaBoard Supporter

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    My first guess would be a giant squid. Or that giant octopus found in the Pacific NW

    And that is without hoovering over the image to see the file name and doing a simple google search. :D
     
    smellzlikefish likes this.
  10. smellzlikefish

    smellzlikefish Marine Scientist

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    Well that's a rookie mistake on my part! Damn.
     

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