9622

• UCREFRP Catalog Number: 9622
• Author: Schofield, P. J. and e. al.
• Title: Foreign Nonindigenous Carps and Minnows ‎(Cyprinidae)‎ in the United States - A Guide to their Identification, Distribution, and Biology.
• USFW Year: 2005.
• USFW - Doc Type: 2005-5041,
• Copyright Material: NO

Key to Species 9

4a. Scales small, 70 or more in lateral line.................................................................................. ........Go to 5

4b. Scales large, fewer than 65 in lateral line.............................................................................. ........Go to 7

5a. A single small, thin barbel on each side of the head, on upper jaw near corner of mouth (fig. 5);
belly rounded, without keel on venter; posterior margin of caudal fin straight or slightly forked;
color of body variable, dark brown to black, to dark green or greenish yellow, often bronze or
yellow below; one variety ("Golden Tench") uniformly golden yellow with dark blotches.

.................................................................................................................. Tench (Tinea tinea) Page 73

5b. No barbels around the mouth; keel present, either along entire midline of belly or posterior
to pelvic fin base; caudal fin distinctly forked; body color generally gray or silver above and
white or cream below.................................................................................................................... Go to 6

Figure 5. Head of Tench, showing single
barbel near corner of jaw.

6a. Body color on sides generally uniformly gray or silver, without scattered irregularly shaped dark
blotches; ventral keel long, extending along midline of belly from anus forward almost to junction
of gill membranes (fig. 6A); rakers on first gill arch fused into a sponge-like structure (fig. 7 A);
when apressed, pectoral fin does not extend to base of pelvic fin.

........................................................................... Silver Carp (Hypophthalmiehthys molitrix) Page 45

6b. Body color on sides gray or silver with numerous small, irregularly shaped dark blotches; ventral
keel relatively short, extending from anus forward to near origin of pelvic fins (fig. 6B); rakers
on first gill arch long and slender, comb-like, not fused into a sponge-like structure (fig. 7B);
when apressed, pectoral fin extends beyond pelvic fin origin.

......................................................................... Bighead Carp (Hypophthalmiehthys nobilis) Page 51

7a. Lateral-line scales fewer than 50 .................................................................................................. Go to 8

7b. Lateral-line scales 55-63.......................................................................... Ide (Leuciseus idus) Page 56