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Tag: fish
Timelapse of my four weeks old dutch-style planted tank.
The Brownsnout Spookfish (Dolichopteryx longipes) is a spooky Barreleye from the deep sea.
Why is it called a Barreleye? Because it has barrels for eyes, of course! Actually, that’s just half the story…
Each eye is divided into two distinct parts. The larger, barrel section faces upward and is great for discerning the silhouettes of tiny, tasty copepods in the gloom above.
Next to those is the diverticular eye. These face downward and capture light using mirrors instead of lenses. This is particularly useful for gathering light, allowing the Spookfish to spot bioluminescent predators lurking below.
It doesn’t matter how flabby their muscles or gelatinous their flesh, no-ones sneaking up on the Brownsnout Spookfish!
Those pellets are too big for you, Triton.
Cory: foob? Foob!! *nibble nibble*
Triton: foob is for big fish leik me *CHOKES*
THIS MADE ME CHOKE ON MY WATER OMG
here come dat wiggle boi ! ! !
@why-animals-do-the-thing an example of trainability in fish! Harder in long-tailed male bettas because they can’t really clear the water, but bettas can be taught to swim through a hoop, and this is the next step up. They’re smart fish who are easily motivated by food.
And that thing in the background is a betta hammock. Bettas like to lounge near the surface of the water so they can easily wiggle up to the surface for a breath, and some will even lounge in areas so shallow they’re barely covered by water. Their favorites are places where they only have to lean their head up for a breath.
Did blind cavefish evolve by breaking the laws of evolution?
We’ve found out why a Mexican cavefish has no eyes – and the surprising answer is likely to be seized upon by those who think the standard view of evolution needs revising.
Over the past few million years, blind forms of the Mexican tetra (Astyanax mexicanus) have evolved in caves. Maintaining eyes and the visual parts of the brain uses lots of energy, so the loss of eyes is a big advantage for animals living in the dark. Instead the cavefish “see” by sucking.
It was assumed that these fish became blind because mutations disabled key genes involved in eye development. This has been shown to be the case for some other underground species that have lost their eyes.
But Aniket Gore of the US’s National Institute of Child Health and Human Development and colleagues haven’t found any disabling changes in the DNA sequences of eye development genes in the cavefish.
Did blind cavefish evolve by breaking the laws of evolution?
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