Shorefishes of the Greater Caribbean online information system

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Species: Carcharhinus isodon, Finetooth shark

All Families:   All Genera:   All Species:

snout pointed, length < mouth width
D1 origin over/just behind pectoral rear tip
no crest between Ds
teeth both jaws ~symmetrical, straight, tips narrow, no/weak serrations
blue-grey; fins unmarked
color uniform

Carcharhinus isodon (Müller & Henle, 1839)

Finetooth shark

Body relatively slender; eyes large, round, nictitating eyelids present; snout pointed, length before mouth < mouth width, ~1.1-1.3 time width between nostrils; anterior nasal flaps very reduced; upper lip furrows short, not very noticeable; top and bottom teeth nearly symmetrical, with non-oblique narrow points, lower teeth smooth, upper teeth weakly and irregularly serrated; 12-16 rows of teeth on side of top jaw; spiracle absent; gill slits very long (3rd slit longest, > height of anal fin), last two over pectoral, no papillae; first dorsal relatively small, front margin a little convex, rear margin concave, its origin over or just behind free rear tip of pectoral fin; second dorsal relatively large, with slightly concave rear margin, its origin over or slightly behind that of the anal fin; anal fin with deeply notched rear margin; pectoral fins small, narrow, with angular front edge; no ridge on top of body between dorsal fins; no keel on tail base; tail fin strongly asymmetrical, with well developed lower lobe, undulating ridge along dorsal surface of top lobe, and a notch under tip of that lobe.

Blue-grey on top, greyish on sides, white below, white band on sides, fins unmarked.

Size: 160 cm.

Habitat: an inshore shark.

Depth: 0-20 m.

The central eastern United States to Brazil.


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Salinity
  • Brackish
  • Marine
Inshore/Offshore
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Mid Water
  • Near Bottom
  • Near Surface
Habitat
  • Water column
  • Mud
  • Sand & gravel
  • Estuary
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
Diet
  • Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
  • Octopus/squid/cuttlefish
Egg Type
  • Data
  • Live birth
  • No pelagic larva
Global Endemism
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Extends South of GC
  • Also in Brazil
  • GC non-endemic
  • Continent + Island (s)
  • Continent
  • Extends N + S of GC
  • Continental primarily
  • Extends North of GC
  • Island (s)
Residency
  • Resident
Climate Zone
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Listed
  • Least concern
CITES
  • Not listed
Length Max (cm)
  • 160
Depth Range Min (m)
  • 0
Depth Range Max (m)
  • 20