Aquatic life standards are based on the variety and
abundance of fish, bugs, and vegetation. A
very strong connection exists between water quality and the abundance and
variety of fish, bugs, and vegetation.
Ohio,
Arkansas,
Maine, and
North Carolina
are among a handful of states that use both chemical and biological data in
determining water quality standards. The
water quality standards as applied to aquatic life are assigned based on the
potential fish, bugs, and vegetation that can be expected to live in a specific
region. Many streams in the Darby
Watershed (Big and Little Darby, Buck Run, Hellbranch Run, Flat Branch…) have
an aquatic life designated use based on the condition of the fish, bugs, and
vegetation during previous samplings. When
portions of a watershed do not meet water quality standards they are analyzed to
determine whether their current use meets the designated aquatic life use.
Additionally, many new points in the watershed were sampled that did not
have an aquatic life designated use (Barron Run, Smith Ditch…).
Through a formal rule making process by Ohio EPA, an aquatic life use
designation will be applied to new streams based on the potential of the stream
to perform at pre-determined water quality standards.
By default, all streams in
Ohio
that have not been sampled and have no aquatic life use designation are
warmwater habitats (WWH). It is
important to know that the aquatic life designated use of a stream must always
be protected as to not degrade, streams but only maintain and improve.
The specifics of aquatic life designated uses and how this is determined
will be discussed in the following sections.
Section Navigation
a. Aquatic life use designations
b. Aquatic life use indices
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