Main Question or Discussion Point
Do fish care about what the environment outside the tank they are in looks and sounds like? Do they know they are in a tank?
I'm glad you said 'occurs repeatedly' because I remember when I was a child I lived near a lake and an old man (probably old as I am now) used to feed the fish from his dock every day at the same time. The fish would gather together in the same spot at the correct time each day. Maybe that's memory.Fish do have a long term memory of sorts and can remember things if the same thing occurs repeatedly but as Type 7 says i doubt they care what their view is like
That's interesting. Ceteceans (whales) evolved from 15 foot long dog-like mammals. The length of their body was so great that they continually sought out food in swamps and shallow water to support its weight and awkwardness. Continually dunking their heads in water over a few million years (from 25 million years ago) slowly saw natural selection select the animals with nostrils that were higher up the skull than the others. Slowly, (again) the mammal ended up in open water, swimming more and rarely making land fall.I don't know if this applies to other than carp (including goldfish), but they will cease growing when they reach the size that is suitable for the tank. Can't say as I've ever heard of one shrinking to fit a tank that's already too small, though.
Neat information about measuring them, Tommy. I never heard of that before.
Which makes one wonder why there were much, MUCH larger animals roaming about that didn't have this happen.The length of their body was so great that they continually sought out food in swamps and shallow water to support its weight and awkwardness.
A monstrously large tail was selected as an offset to their enormous structure... ?... just a guess. This was accompanied by a ganglion bundle of nerves in the CNS near the "lower" spinal area that acted as a controller for the tail. Much like a train with a long payload has secondary engines.Which makes one wonder why there were much, MUCH larger animals roaming about that didn't have this happen.
If 'bodies of a certain size need water to support them' is a strong evolutionary driver, then how did apatosaurs, seismosaurs and their ilk manage just fine?