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¿Question #978?
[Deleted user]: [deleted question]

Deleted042515: Magic!
Rosebud: They probably have a radial body.
Lori713: Gravity?
TheArchAngel: ?
DHEK: Gravity. They can feel its effects, just like we can.
Ebon Wendigo: My guess would be long forgotten alien technology.
POvidiusNaso: Magic.
Leo-T: Fish don't go through a larval stage. They are hatched from eggs as fry, then grow. Orienting in their environment depends on the species.
PsyJam: to music!
jgoewert: upside down
vampywife: hmm...when i was a marine biologist in another life, i could have told you.
Big Bad Lex: Sea Magic
puffinge: I am unmoved by this question
bigbadsteve: they fake it
SteveK2: probably just like regular fish
stray_flux: That sure is one interesting question i don't know the answer to.
LemonyFresh: With the greatest of ease.
_Kael_: Nokia?
Great Dane: I don't know
Loquutus: voodoo
flyinghogfish: With their fins?
GrandpaDave: Magic
ssmooth: I don't know. Does gravity have something to do with it?
Lord_Prussian: Don't know
AdamT: Up and down and side to side.
leece: They ask Mr Ray.
skrutsch: I don't know, but if you do a Google search, there a bunch of PDFs about it.
Wernazuma: vertically and horizontally I guess
2amp: magic
Belash: ask MisterCranky
rdmasters: Laterally horizontal, dorsal surface up. (ie normal orientation) There is a densiometer-like organ inside their skulls that allows them to determin 'up'. IIRC. Which I probably do not.
erli: Vertically orient
heli: need you be so literal?
snoozefest: don't know
Wintergoblin: not sure
tragicpoet: puppet strings
minordemon: diagonally of course
m_r_tyler: I don't know that.
davedanger: a significant mixture of altitude sensing combined with pressure perception.
TiNYTimIDFluffYBunnY: rule of thumb
Aldie: Is there a marine biologist around?
onky: By GPS
Blackwind: what?
Bluenose: positive geotrophism
StormKnight: I haven't played recently enough to remember.
CortexBomb: I can't say that I know
dakarp: They read the Reef Encounter rules before heading out.
geberus: ?
gnomehome: The answer can be found in 'Finding Nemo'
BobDodgerBlue: Never Answer
Eric Haas: gyroscopes
shumyum: with abandon
chaddyboy_2000: Orientitis?
skelebone: They're on a magnetic gridwork.
CDRodeffer: Via a minute water velocity gradient near surfaces.
Flyspeck23: By accident?
ValJor: That is a question for AskJeeves
Shakar: I don't know that!
jttm: They follow other fishes