Re: NANFA-- catch F. olivaceous vs. notatus

Bruce Stallsmith (
Mon, 30 Apr 2001 11:06:14 -0400

>From: "William Allen jr." <>
>To: <>
>Subject: NANFA-- catch F. olivaceous vs. notatus
>Date: Mon, 30 Apr 2001 00:46:12 -0500
>Please, someone, tell me how to tell these two fish (Fundulus notatus and
>F. olivaceus) apart
The best way to tell olivaceus from notatus is simply that olivaceus fishes
have distinct black spots dorsally above the mid-body black stripe, while
notatus individuals don't. Other than that, the differences are subtle.
Olivaceus can get bigger, up to 97 mm vs. 74 mm for notatus; olivaceus
prefer faster flowing, clearer streams; and there's reason to believe that
notatus are more aggressive feeders and can displace olivaceus. In general
you'll find one or the other species in a given area. Stressed olivaceus can
also lose much of their spotting which will confuse the pants off of people
trying to figure out which is which.

--Bruce Stallsmith
Huntsville, AL

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