check out philc's magnet tutorials. the daz largemouth bass is a cr2 figure with fairly good body parts, but fish don't bend similarly to humans. with magnets on the fins, they can all be made to bend and twist quite easily. a wave deformer on the body can simulate the sinusoidal flexing that the bass uses to propel itself forward. the opening of the mouth and movement of the gill covers is an advanced topic, however.