De­struc­tive liv­ing cargo

Wisconsin Gazette - - Opinion -

argo ves­sels have in­tro­duced a num­ber of aquatic in­va­sive species — such as ze­bra mus­sels and round go­b­ies — that have cost the re­gion bil­lions of dol­lars since the late 1980s, ac­cord­ing to the Al­liance for the Great Lakes.

Two non-na­tive zoo­plank­ton — Ther­mo­cy­clops cras­sus and Bra­chionus ley­digii — were found in Lake Erie in re­cent years.

And, in Fe­bru­ary, re­searchers an­nounced a bloody red shrimp was found in the Du­luth-Su­pe­rior har­bor on Lake Su­pe­rior.

Bloody red shrimp were brought by bal­last tanks into the Great Lakes and were first dis­cov­ered in 2006 in lakes Michi­gan and On­tario.

— Lisa Neff

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