Starfish are not actually a fish at all , but are animals belonging
to the Phylum Echinodermata, and are further divided into two classes
Asteroidea(sea stars) and Ophiuroidea(brittle stars). Although starfish
are thought to be passive they can be quite a voracious predator under the sea.
Starfish feed primarily on mollusks and other echinoderms.
While starfish are commonly represented as having only 5 legs ,
there are some that exhibit many more.
If you have a young child, then here's a nice bedtime story to
read them instead of buying a starfish
ONCE UPON A TIME......
The Lonely Starfish
Read about The Starfish Nervous System
Starfish are unusual among animals for a variety of reasons.
One important reason is their radial symmetry
— they don't have a "front" or "back" end. Probably for this reason, they
haven't concentrated the tissues of their nervous system into any kind of central body
— that is, they have no brain.
The central nervous system of a starfish consists of a radial nerve running
the length of each ray and a circumoral ("around the mouth") nerve ring
that connects the radial nerves. Contrary to what you might expect,
the nerve ring doesn't seem equipped to do any kind of processing of information.
Instead, all the sensory information must go to the radial nerves, any memories
must be stored in the radial nerves, and any decisions about what to do must be
made in the radial nerves. And somehow, the five different radial nerves must
coordinate those decisions if the starfish is going to get anywhere.
Fun Alternatives: READ ON ...
The best theory is that some sensory information is shared between the
different rays (it is unclear how much, or how far it goes), and that the rays
can inhibit each other — that is, one ray can take charge of the whole starfish
for a time. When moving, this seems likely to be the arm in front of the starfish.
When trying to locate an odor, the ray sensing the odor most intensely seems
to be the one which takes charge, directing movement in its own direction.
Despite this odd arrangement, starfish seem to get along fine. Not only can they
locate food and mates, they also can learn to associate particular textures of substrate
(gravel vs. sand, for example) or levels of illumination (light or dark) with the presence
of food. (Feeding behaviors are the easiest to train and observe, so most learning
experiments have concentrated on these.) They also can distinguish different odors
and learn to ignore those which are not associated with food. (In these experiments,
the researchers gave clay tablets the smell of the starfish's normal prey and found
that the starfish quickly learned to ignore them.) Their ability to thrive with such an
odd nervous system is a reminder that our way of thinking may not be the only way.
What have poor star fish got to do with
Poor little sods!
Die then dyed, then flung into a container
for tourists to ponder if u will make a nice prezzie
or end up on their bathroom wall?
- Family Travel
- Castles and Palaces
"Well if your good children, we can see the creepy crawlies and snakes!"
Don't stick your hands in the glass containers!
I think it cruel to imprison any living thing for humans to gawk at!
Better to see them in the wild!
I mean not to meet them face to face, but let them
live in their natural habitats!
I suppose if showing them to humans and they are looked after in the best
possible way to cope with their needs and it hightens peoples respect for
them and more people will make sure these creatures don't become extinct,
then keeping some captive might be a 'necessary evil'?
- Family Travel
- Castles and Palaces
- School Holidays