hannah, 20 years old, cis female. posts about all kinds of fish, and occasionally about my other pets (rats and snakes). vegetarian and transitioning vegan.
*hears odd noises from rat cage*
*odd noise returns, louder*
Two female rats, but still very young (a month old).
Fish Out of Water Learn to Walk
Around 400 million years ago, fish left the water and started to evolve into land-loving creatures. But how did the transition happen? A new and unusual experiment could shed some light on the kinds of changes that enabled fins to become limbs. Researchers took a fish species known to be able to walk on its fins from time to time, and raised it on land. Watch the fish promenade in this Nature Video.
Read the paper: http://dx.doi.org/10.1038/nature13708
Read the News & Views: http://dx.doi.org/10.1038/nature13743
I LOVE EVERYTHING ABOUT BICHIRS
In the market for a new cage for Isis and Cleo (two month-old rats). I’m afraid my make-shift cage isn’t cutting it. Looking for a sturdy and affordable cage with bars they won’t be able to fit through.
Best young rat-friendly cages?
I have had these nerds for just under 24 hours and it is becoming apparent that it would be a total waste if I didn’t train them.
I mean they are the craziest fucks I have ever met. They’re so quick and are brave to a point of stupidity. I literally watched Isis climb across the top of the cage like monkey bars and then fall to the bottom. And then she did it again.
In all honestly I’m surprised they haven’t evolved to grow sticky gecko feet so they can walk on the ceiling.
I’m really happy though because they’re obviously comfortable around me already. They climb up my arm when I reach for them and last night after a long day one fell asleep in my hands while the other crawled in my shirt for a nap.
I don’t care about the sacrifices I’ll have to make to keep them, they’re going to have a long and very happy life in my care.
Hello it is your friendly fish blog owners housemate and I would like to tell you that you can turn n the gene for tech in xhciejsb and that your
Blog owner entrusted her phone to me
USING LIVING FISH TO STUDY ANCIENT EVOLUTIONARY CHANGES: How plasticity works in evolution race
Ambitious experimental and morphological studies of a modern fish show how developmental flexibility may have helped early ‘fishapods’ to make the transition from finned aquatic animals to tetrapods that walk on land.
The origin of tetrapods from their fish antecedents, approximately 400 million years ago, was coupled with the origin of terrestrial locomotion and the evolution of supporting limbs. Polypterus is a ray-finned fish (actinopterygians) and is pretty similar to elpistostegid fishes, which are stem tetrapods. Polypterus therefore serves as an extant analogue of stem tetrapods, allowing us to examine how developmental plasticity affects the ‘terrestrialization’ of fish. How else would you find out what behavioral and physiological changes might have taken place when fish first made the move from sea to land over 400 million years ago? putting a fish walking on land.
To find out exactly what might have happened when aquatic animals first moved to land, Researchers took 111 juvenile Polypterus senegalus a fish species that goes by the common name Senegal bichir, or “dinosaur eel" — and raised them for eight months in a terrestrial environment. This environment consisted of mesh flooring covered in pebbles and just 3 millimeters of water — a precaution that, combined with water misters, prevented the fish from drying out. The researchers also formed a control group using 38 fish growing up in their usual aquatic environment.
Dinosaur eels also have gills, but they breathe at the surface regularly to increase their oxygen supply. They also occasionally use their fins to walk on land. Results raise the possibility that environmentally induced developmental plasticity facilitated the origin of the terrestrial traits that led to tetrapods.