Understanding the human body is a team effort. That's where the Yachtel group comes in.

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That's y-A-K-U-L-T dot-C-O-J-P.

When it comes to a guide for your gut, count on Yacolt.

This is Scientific Americans' 60-second science.

I'm Steve Merski.

There's the first of the Elwives. All silvery, they're all about the same size.

You can't tell the boys from the girls. These will be the first.

Stephen Gephard, fisheries biologist with the Connecticut Department of Energy and Environmental

Protection.

Gephart brought 400 alewives down from the Nutmeg State to be released into the Bronx River

on the grounds of the Bronx Zoo on April 20th.

The Bronx River was once so polluted that it was called an open sewer, but it's been cleaned up to the point where it can now once again support these fish,

which were common here in the 19th century.

Elwives are herring. They're kind of like a miniature shad.

John Waldman is an aquatic conservation biologist at Queens College, who was on hand for the release.

They're born in freshwater.

They rear for the first year in fresh water, then go to sea,

spend a few years growing larger,

and then return to the river they were born in,

...