Fisheries Bio and Techniques Fish

fish.

Elongated, snake-like

body

Sucking disc

No paired fins, no scales

7 pairs of gill openings

Petromyzontidae

Heterocercal tail

Posterior dorsal fin

Inferior mouth

Inferior barbels

5 rows of bony scutes

Acipenseridae

Ganoid scales
 Long, toothed jaws
 Cylindrical body
 Rounded caudal

Lepisosteidae

 Dorsal fin > ½ length of
body
 Gular plate
 Tubular nostrils
 Rounded heterocercal tail

Amiidae

 Elongated, snake-like body
 Linked dorsal, caudal, and
anal fin
 Embedded scales
 No pelvic fin
Steve Lowry/Science Photo Library

Anguillidae

fusiform, round to strongly
compressed body
• keeled row of scutes along
midline,
ventral side
• single dorsal fin midbody
• forked caudal
• Small terminal mouth
• shiny cycloid scales

Clupeidae

 Silvery, compressed
shape
 Enlarged teeth on tongue

Large eye

Hiodontidae

Streamlined, torpedo-
shaped
 Single dorsal fin

Adipose fin

Salmonidae

Silvery to dark brown
 Black or black tipped
fin
 Laterally
compressed

Salmonidae (Genus coregonus)

Small to mid-sized slender body
 Single dorsal fin
 Adipose fin
 Lateral line present (often incomplete)

Osmeridae

Elongated body
 Duck-bill like
snout/mouth
 Forked caudal fin
 Single posteriorly-
seated dorsal fin
 Many small lateral scales

Esocidae

No teeth
 Single dorsal fin
 28 spp in
Vermont
 Single dorsal fin,
usually no spine
and 8 rays

Cyprinidae

Subterminal mouth with thick, papillose
mouth
 One dorsal fin, forked caudal

6 species in vermont

Catostomidae

Scaleless
 Four pairs of
barbels

Adipose fin

Ictaluridae

Small body size
 Adipose fin
 Subabdominal pelvic
fin
 Rough-edged ctenoid
scales
 Dark circular spots on
upper part of the
body

Percopsidae

Elongate body
 Two dorsal fins (second very long)
 Pair of chin barbels
 Jugular pelvic fin
 Rounded tail
 Anal fin as long as second dorsal
 Small scales (looks scaleless)
Big Fishes of the World

Gadidae

Elongated body
 Two dorsal fins (first very
short)
 Forked caudal
Elongated anal fin

Atherinidae

5 [2 – 7] unconnected dorsal
spines followed by a dorsal fin
 Anal fin with a single spine
 Pelvic fin has a single spine and
a ray

Gasterosteidae

Large eyes, sit high on head
 Head flattened dorso-ventrally
 Two narrowly-connected dorsal fins
 First dorsal has soft spines, second soft
rays

No scales

Cottidae

First dorsal fins has spines
 Second dorsal fine has one
spine and 10-13 soft rays
 Large mouth

Moronidae

Laterally compressed body
shape
 First dorsal fin with spines
 Second dorsal fin with rays

Ctenoid scales

Centrarchidae

Laterally compressed body
shape
 First dorsal fin with spines
 Second dorsal with rays
 Ctenoid scales

Percidae

Humped back with
long,
slopping forehead
• First dorsal with
spines
• Second dorsal with
single spine and 24-
30 rays
• Pharyngeal teeth

Sciaenidae