anal fin
Fish belly rudder
The anal fin is the unpaired fin on the underside of a fish, located between the anus and the tail.
It provides stability during swimming, preventing the fish from rolling.
Some species have modified anal fins for reproduction or display: The male guppy's anal fin is adapted for mating.
Of the back
ventral · posterior · ichthyology · teleost · swim bladder · vertebrae · cartilage · operculum
Force driving movement forward
- steeringControlling direction of movement
- stabilizationProcess of becoming steady
- thrustForceful forward motion
- maneuveringSkillful directional control
undulation · swimming · gliding · braking · pitch · roll · hydrodynamics · streamline
Stretched beyond usual dimensions
- roundedHaving no sharp angles
- forkedDivided into prongs
- spinyHaving sharp points
- fleshyThick with soft tissue
modified · clasper · coloration · spot · stripe · insertion point · origin · termination
dorsal
Of the back
spine · ventral · posterior · ichthyology · teleost · swim bladder · vertebrae · cartilage · operculum · gill slits
propulsion
Force driving movement forward
- steeringControlling direction of movement
- stabilizationProcess of becoming steady
- thrustForceful forward motion
maneuvering · undulation · swimming · gliding · braking · pitch · roll · hydrodynamics · streamline · acceleration
elongated
Stretched beyond usual dimensions
fleshy · modified · clasper · coloration · spot · stripe · insertion point · origin · termination