Longfin Inshore Squid
ExploreInvertebrate
Longfin Inshore Squid
doryteuthis pealeii
The Longfin Inshore Squid (Doryteuthis pealeii) is a highly dynamic cephalopod found in the northwest Atlantic Ocean. Well-known for its schooling behavior and incredibly rapid movements, this species plays a vital ecological role both as a voracious predator of small fish and crustaceans, and as a primary food source for marine mammals, seabirds, and larger fish. They are remarkable for their complex social interactions, which are largely mediated by their highly advanced, instantaneous color-changing capabilities. In scientific history, this squid holds a legendary status. Its giant axon, which is hundreds of times larger than a human neuron, served as the foundational model organism for pioneering neurobiologists, leading directly to the discovery of how nerve impulses travel along cellular pathways.
Habitat: Typically found in temperate continental shelf and slope waters, ranging from very shallow coastal bays and estuaries during summer to deep offshore waters up to 400 meters in winter.
Appearance
This squid features a long, torpedo-shaped mantle with large, rhomboidal fins that extend along at least half of the total length of its body. Its coloration is highly variable due to specialized pigment cells, rapidly shifting from translucent white and iridescent greens to deep reddish-browns depending on its environment and emotional state. It possesses eight arms and two longer feeding tentacles lined with sharp-ringed suckers, alongside large, complex eyes that lack a cornea.
KingdomAnimaliaPhylumMolluscaClassCephalopodaOrderMyopsidaFamilyLoliginidaeGenusDoryteuthis
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
Be the first to snap!
Interesting facts
Like most squids, they possess three separate hearts: two branchial hearts to pump blood to the gills and one central systemic heart to circulate blood to the rest of the body.
The giant axon of this squid is up to 1,000 times wider than a human neuron, which made it highly instrumental in the discovery of how nerve cells transmit electrical signals.
They lay their eggs in communal spawning grounds, creating large, clustered structures of gelatinous capsules often called 'sea mops'.
Special abilities
Ability
Dynamic Chromatophores
Using specialized pigment cells controlled directly by its brain, the squid can instantaneously alter its skin color and patterns to camouflage or communicate with other squids.
Ability
Jet Propulsion
By forcefully expelling water from its muscular mantle through a directional siphon, it can achieve incredibly fast bursts of forward or backward acceleration.
Ability
Rapid Neural Reflexes
Possesses a giant axon system that transmits electrical impulses at extreme speeds, allowing for near-instantaneous escape reflexes when threatened.
Measurements & details
- Length
- 1550+ cm
- Weight
- 0.10101+ kg
- Lifespan
- 11+ years
- Top Speed
- 25 km/h
- Clutch Size
- 1000020000+
- Incubation
- 1127+ days
- Migration Distance
- 200 km
Diet & Feeding
An active and opportunistic predator that hunts in schools, preying primarily on small schooling fish, crustaceans, and other cephalopods.
Age differences: Larvae and juveniles feed on tiny planktonic copepods and larval fish, while adults transition to larger fish, crabs, and frequently engage in cannibalism of smaller squid.
Primary Foods
- Atlantic Herring
- Sand Lance
- Mysid Shrimp
- Juvenile Squid
Foraging Method
- Pursuit
Ecological connections
eaten by
Bluefish
Pomatomus saltatrix
The bluefish is a major predator of the longfin inshore squid in coastal waters during the summer months.
hunts
Atlantic Herring
Clupea harengus
Adult squids actively hunt schools of young Atlantic herring as a primary energy source.
eaten by
Summer Flounder
Paralichthys dentatus
Summer flounders share sandy bottom habitats and prey heavily upon squid resting near the sea floor.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
Collections for this object will appear here as more themes are added.
Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Longfin Inshore Squid?
The easiest way to identify Longfin Inshore Squid is to use the Snappit nature identifier app.
How long is Longfin Inshore Squid?
1550+ cm
How much does Longfin Inshore Squid weigh?
0.10101+ kg
How long does Longfin Inshore Squid live?
11+ years
How fast can Longfin Inshore Squid move?
25 km/h
What does Longfin Inshore Squid eat?
An active and opportunistic predator that hunts in schools, preying primarily on small schooling fish, crustaceans, and other cephalopods.
Where is Longfin Inshore Squid usually found?
Typically found in temperate continental shelf and slope waters, ranging from very shallow coastal bays and estuaries during summer to deep offshore waters up to 400 meters in winter.
How does Longfin Inshore Squid hunt?
Pursuit
Snap Map
Zoom in to split clusters and explore where this object has been snapped.
Loading map…
Recent Snaps
Recent snaps will appear here as new observations are added.