| Glossary Term starting with L |
| Search SeaLifeBase |
| Laberdan |
| Labial |
| Labial fold |
| Labial furrows |
| Labrador cure |
| Labrador Sea |
| Labrisomids |
| Labyrinth |
| Labyrinth organ |
| Laccadive Sea |
| Lachrymal |
| Lachrymal groove |
| Lachsbückling |
| Lachshering |
| Laciniate |
| Lacustrian |
| Lacustrine |
| Lady day fish |
| Lagena |
| Laggy |
| Lagoon area |
| Lagoon floor |
| Lagoon fringing reef area |
| Lakérda |
| Lam net |
| Lamayo |
| Lamellae |
| Laminar flow |
| Laminarin |
| Lamnoid |
| Lampara |
| Lampreys |
| Lanceolate |
| Lancetfishes |
| Land-locked |
| Landings |
| Landrace |
| Landscape diversity |
| Lantern net |
| Lanternbellies |
| Lanterneye fishes |
| Lanternfishes |
| Lap tail |
| Lapillus |
| Lappet |
| Lapsus calami |
| Laptev Sea (or Nordenskjöld Sea) |
| Large-tooth flounders |
| Largenose fishes |
| Larsen midwater trawl |
| Larva |
| Larvaceans |
| Larvae |
| Larval development |
| Larval settlement |
| LarvalBase |
| Larviparous |
| Larvivore |
| Larvophile |
| Late embryo |
| Lateral |
| Lateral canal |
| Lateral clasper fold |
| Lateral ethmoids |
| Lateral keel |
| Lateral line |
| Lateral line count |
| Lateral line scales |
| Lateral scale rows |
| Lateral series scales |
| Lateral skin fold |
| Lateralis system |
| Laterocaudal |
| Laterosensory pores |
| Latitude |
| Laukkasvolattu savustettu silli |
| Laverbread |
| Law of Fishing |
| Lay on back |
| Lay parallel on substrate |
| Layer depth effect |
| Layer packed |
| LD50 |
| Lead line |
| Leaffishes |
| Lecithotrophic larva |
| Lecithotrophic live bearer |
| Lecithotrophy |
| Lecitrophic |
| Lectotype |
| Lee |
| Leeward |
| Lee´s phenomenon |
| Lefteye flounders |
| Leggy |
| Lek |
| Length at first maturity |
| Length distribution |
| Length of caudal peduncle |
| Length-weight relationship |
| Lentic |
| Lepidophagous |
| Lepidophagy |
| Lepidorthosis |
| Lepidotrichia |
| Leptocephalus |
| Leptocercal |
| Leptochilichthyids |
| Lessepsian migration |
| Lethargy |
| Leucophore |
| Levant |
| Levee |
| Lever net |
| Life cycle |
| Life table |
| Lifespan |
| Lift net |
| Lightfishes |
| Ligurian Sea |
| Liman |
| Limicolous |
| Liming |
| Limit reference point |
| Limited entry fishery |
| Limnicolous |
| Limnion |
| Limnivorous |
| Limnodromous |
| Limnology |
| Lincoln Sea |
| Lindsey´s rule |
| Lineage |
| Linear |
| Liner |
| Linf |
| Linnaean tautonymy |
| Lip groove |
| Lipid |
| Lipophore |
| Lipostichaerin |
| Lips |
| Liquamen |
| Liquid fish |
| Listserver |
| Lithophilic |
| Litter |
| Litter size |
| Littoral |
| Live weight |
| Live well |
| Live-bearing |
| Livebearers |
| Lizardfishes |
| Lm |
| Loach catfishes |
| Loach gobies |
| Loaches |
| Lobate |
| Lobe |
| Local Area Network |
| Local extinction |
| Locking mechanism |
| Locks |
| Locus |
| Logical database |
| Logistic population growth |
| Loin |
| London cut cure |
| Long-finned pike |
| Long-term potential yield |
| Long-whiskered catfishes |
| Longevity |
| Longitude |
| Longitudinal |
| Longitudinal scale series |
| Longline |
| Longliner |
| Longneck eels |
| Longnose chimaeras |
| Longtail catfishes |
| Loosejaws |
| Lophichthyid frogfishes |
| Lophocercal |
| Lorenzini´s ampullae |
| Los Angeles County Museum of Natural History, Los Angeles |
| Lotic |
| Louisiana State University, Division of Fishes, Museum of Zoology, Baton Rouge |
| Louisiana Tech University, Ruston, Louisiana |
| Louisiana Wildlife and Fisheries, Marine Biological Laboratory Museum, Louisiana |
| Louvars |
| Low island earthform |
| Lower limb |
| Loweye catfishes |
| Lozenge-shaped |
| Lt |
| Luciferase |
| Luciferin |
| Luciferous |
| Lumbar |
| Lumen |
| Luminous organ |
| Lumpfishes and snailfishes |
| Lumping |
| Lunar rhythm |
| Lunate |
| Lunker |
| Lunula |
| Lure |
| Lutefisk |
| Lycophyta |
| Lymphatic heart |