Length or Size Measurements

Recommended measurements of body length for various target species.

Species

Diagram

What/How to Measure

Fish



Maximum body length is the length from the
anterior-most part of the fish to the tip of the
longest caudal fin ray (when the lobes of the
caudal fin are compressed dorsoventrally
(Anderson and Gutreuter, 1983).



Maximum body length



Crab







Carapace width

Carapace width is the lateral distance across the
carapace (from tip of spine to tip of spine
(U.S. EPA, 1990c).

Bivalve

Height

I 1

1 |

Height is the distance from the umbo to the
anterior (ventral) shell margin (Galtsoff, 1964).

Shrimp and
Crayfish

Body length

p i

j Carapace
l Length

Body length is the distance from the tip of the
rostrum to the tip of the telson (Texas Water
Commission, 1990).

Carapace length is distance from top of rostrum to
the posterior margin of the carapace.

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Spiney
Lobster

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