- Lampara net
- a surrounding net with the center bagging part in the form of a spoon and two lateral wings, making it possible to retain the shool of fish when the two wings are hauled up at the same time.
- Lappet
- lobes around margin of the bell of most true jellies
- Larva
- immature stage of an animal that must metamorphose before assuming adult form and characteristics
- Larvae
- immature stage of an animal that must metamorphose before assuming adult form and characteristics
- Lateral line
- sensory canal system running along the flanks (sides) of most fishes and some amphibians that detects water movement, disturbances and vibrations
- Leach
- to remove unwanted parts of a substance by a percolating or filtering liquid
- Littoral
- intertidal zone along or on the coastline or shore
- Locomotion
- act of moving; the ability to move from place to place
