necto-, nect-, nekto-, nek- +

(Greek: swimming)

epinekton, epinektonic
Organisms attached to actively swimming (nektonic) forms but which are incapable of independent movement against water currents.
Spending the life span swimming.
Swimming in fresh water; such as, ponds or marshes.
Partial swimmers or passing only part of the life-cycle swimming.
Swimming by means of cilia.
nectobenthos (s) (noun) (no pl)
An organism that swims actively just above the bottom of the sea, a lake, or another body of water: Jack was able to see the small nectobenthos swirling around at the lowest part of the stream close to his home.
1. One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.
2. The swimming bell or umbrella of a jellyfish of medusa.
3. A modified medusiform adapted for swimming purposes found as part of a siphonophore colony.
A free-swimming larva in some polychaetes bearing rings of cilia and three pairs of parapodia.
nectocyst, nectosac
The cavity (used for swimming) of a nectocalyx.
A free form of certain parasitic flagellates.
1. The aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales.
2. Members are capable of counteracting currents through various swimming mechanisms.

The group includes adult fish, some crustacea, cephalopods, and marine mammals.

Consisting of marine hairworms with a parasitic stage in various crustaceans, a double row of natatory bristles (used in swimming), and an expansive pseudocoel (body cavity which is not a normal stomach).
A long slender sea worm (hairworm) with short bristles along either side for swimming, whose larvae live as parasites on crabs and related crustaceans. Genus Nectonema.
A swimming bell of a siphonophore (Hydrozoa with hollow floats).
In zoology, a limb (as of a mollusk) adapted for swimming or a swimming organ.

Word families with similar applications about: "swim, swimming": nata-; neusto; pleo-.

Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: abysso- (bottomless); Atlantic; batho-, bathy- (depth); bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); oceano-; pelago- (sea, ocean); plankto- (drifting); thalasso- (sea, ocean).