Merrick and Kent Montgomery
developed this lesson.
will learn about the relationship between dissolved oxygen (DO) concentrations
and water temperature and the limits oxygen concentration and water
temperature may impose on fish species.
introduces students to the basic relationship between dissolved oxygen
(DO) concentrations and water temperature. Students use that information
as they determine whether a lake association should stock lake trout
(Salvelinus namaycush)into Ice Lake. This lesson builds on familiar
observations, such as bubbles forming in a glass of water as it warms
and minnows dying in a bait bucket when water isnt changed. Students
explore the ability of lake trout to survive in a specific environment.
can meet the goals for this lesson by completing a directed study or
an inquiry lesson.
study lesson consists of a student worksheet that analyzes oxygen solubility
and temperature. Students will need to print the worksheet.
* The directed
study lesson is found in the student section of WOW under the title: "Studying Fish Stocking Decisions."
inquiry lesson places students as Minnesota Department of Natural Resources
fisheries biologists. Students collect and analyze data and develop
a final presentation. The instructor specifies the format of the final
presentation: written paper, oral presentation, poster, or multi-media
presentation. They need to print directions for the student inquiry
* The student
inquiry lesson is found in the student section of WOW under the title: "Investigating Fish Stocking Decisions."
- Describe and graph
the basic relationship between oxygen solubility and water temperature.
- Explain the physical
basis for declining O2 concentration with increasing temperature.
- Graph oxygen/temperature profile.
- Use real data
to make decisions about the suitability of specified lakes for fish
species given the physiological limits of the species.
solubility, temperature, lake trout
no prerequisites, but basic graphing skills and knowledge of
environmental factors help students complete the lesson successfully.
copies of "Studying Fish Stocking Decisions" (for
directed study lesson)
the Internet to retrieve WOW data
Biology - abiotic factors, fish physiology,
Chemistry - oxygen solubility,
Management - fish stocking, lake associations
Thermal Stratification, The Effect of Photosynthesis
and Respiration on Aquatic Chemistry, Properties of Water, Aquatic Respiration
Students can meet the goals for this lesson
plan by completing a directed study or an inquiry lesson. Students
may want the directions for their lessons printed.
* The directed study lesson is found in
the student section of WOW under the title: "Studying Fish Stocking Decisions."
* The inquiry lesson is found in the student
section of WOW under the title: "Investigating Fish Stocking Decisions."
data visualization tools can help illustrate changes in DO and temperature
during an extended period of sampling. These changes could be demonstrated
by advancing the Profile Plotter through several sampling periods or
by creating graphs in Excel (see Figures 1-3). You may want to display
these for the students. This could be done either during your initial
discussions for this lesson, or as part of the discussion and closure
for the lesson.
1. Ice Lake DO and temperature on 6/9/99
2. Ice Lake DO and temperature on 7/6/99
3. Ice Lake DO and temperature on 8/15/99
Study and Student Inquiry
the students knowledge of fish, focusing on the survival needs
of lake trout. What water qualities are necessary for lake trout to
survive in a given lake? What factors need to be considered before stocking
a lake? What social and economic issues are related to stocking? What
can happen if a lake is "incorrectly" stocked?
into pairs to work on the lesson. The students need in-class work time
where they can retrieve WOW data to complete the worksheet.
the Minnesota Department of Natural Resources fisheries biologist scenario
to students. As fisheries biologists, students need to determine whether
or not to stock Ice Lake with lake trout. They should use DO and temperature
to make the decision about stocking.
use WOW temperature and DO levels for Ice Lake after an analysis of
temperature and oxygen concentrations for Mackinaw Lake (provided on
need to decide how they will use WOW data to answer the question of
whether or not to stock. They should choose as many dates as they feel
necessary for data on temperature and DO in Ice Lake.
Management and Analysis
Study and Student Inquiry
graph DO and temperature. Remind students to label axes and include
titles and legends on their graphs.
presentations are over the class should play the role of the Lake Association
and discuss the feasibility of stocking before voting on whether or
not to stock lake trout in Ice Lake.
should explore the lake survey data of the Minnesota
Department of Natural Resources (http://www.dnr.state.mn.us/lakefind).
Ask students to consider the physical characteristics of Clearwater,
Greenwood, Saganaga, and Seagull Lakes (all in Cook County). Lake trout
lakes are most common in Northeastern Minnesota, but even there lake
trout are near the southern edge of their range.
should come to a conclusion about stocking lake trout in Ice Lake. They
need to be able to explain the reasoning behind their decision.
students have completed the lesson, call on at least two groups to
present their findings. Ask the rest of the class to serve as area
who want to know why the DNR has chosen to stock or not stock lake
trout in Ice Lake.
need to make a presentation to concerned anglers about the ability
of lake trout to survive in Ice Lake. The data and analysis should
most of the information needed to complete the report. Specify the
presentation format: a written paper, an oral presentation, a poster,
presentation. Remind students to be prepared to answer any questions
about their research findings.
data tables and graphs demonstrate students ability to retrieve
and present temperature data from a lake using WOW. Completion of the
worksheet or the final presentation provides evidence of their level
of understanding of the conceptual material contained in the lesson.
Department of Natural Resources Lakefinder
Department of Natural Resources (http://www.dnr.state.mn.us/lakefind)
lake survey data in greater detail.