ABSTRACT Educators in grades K-16 have recently placed renewed interest in experiential learning activities for teaching science and mathematics. Agriculture offers numerous authentic activities that can serve as meaningful contexts for teaching and learning. The AgriScience Education Project at the University of Arkansas was established to develop and disseminate agriculturally related teaching and learning materials and activities that teachers can use to teach science and mathematics. The objective of this paper is to describe the Aquaponics in the Classroom program, one of the most successful components of the AgriScience Education Project. Teachers participating in this program receive a classroom-scale aquaponics unit, a packet of printed instructional materials, and a set of student laboratory activities that use aquaponics as a context for teaching and learning science and mathematics. The project has helped teachers of kindergarten through high school classes create aquaponics programs. Primary interest has been from teachers at the middle-school and junior high school grade levels

Carol L Mueller

D M Johnson

Donald M Johnson

Eugene Hilgenberg

G W Wardlow

George W Wardlow

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J. Nat. Resour. Life Sci. Educ., Vol. 31, 2002  55
Enhancing Student Interest in the Agricultural Sciences
through Aquaponics
George W. Wardlow,* Donald M. Johnson, Carol L. Mueller, and C. Eugene Hilgenberg
G.W. Wardlow and D.M. Johnson, Dep. of Agric. and Ext. Education, Univ.
of Arkansas, 205 Agriculture Bldg., Fayetteville, AR 72701; C.L. Mueller,
The Catholic High School of Baltimore, Baltimore, MD 21213; and C.E.
Hilgenberg, Agric. Dep., Crowder College, Neosho, MO 64850. Funded by
the Abernathy Charitable Trust, and the Arkansas Agric. Exp. Stn. Received
13 June 2000. *Corresponding author (wardlow@uark.edu).
Published in J. Nat. Resour. Life Sci. Educ. 31:5558 (2002).
http://www.JNRLSE.org Abbreviations: GFCI, ground-fault circuit interrupter.
ABSTRACT
Educators in grades K16 have recently placed renewed in-
terest in experiential learning activities for teaching science and
mathematics. Agriculture offers numerous authentic activities
that can serve asmeaningful contexts for teaching and learning.
TheAgriScience Education Project at the University of Arkansas
was established to develop and disseminate agriculturally related
teaching and learning materials and activities that teachers can
use to teach science andmathematics. The objective of this paper
is to describe the Aquaponics in the Classroom program, one of
the most successful components of the AgriScience Education
Project. Teachers participating in this program receive a class-
room-scale aquaponics unit, a packet of printed instructionalma-
terials, and a set of student laboratory activities that use
aquaponics as a context for teaching and learning science and
mathematics. The project has helped teachers of kindergarten
through high school classes create aquaponics programs. Pri-
mary interest has been from teachers at the middle-school and
junior high school grade levels.
IN RECENT YEARS, many curriculum development projectshave promoted experiential learning as both an effective and
enjoyable way for students to master science and mathemat-
ics content (Hodson, 1990). According to Borko and Putnam
(undated, p. 35), educators are showing renewed interest in
how learning in schools might be better contextualized or sit-
uated in meaningful settings so that the resultant knowledge
ismore accessible and useful to students
Agriculture offers numerous authentic activities that can
serve as meaningful contexts for teaching and learning (Na-
tional Research Council, 1988). One of the primary purposes
of the AgriScience Education Project at the University of
Arkansas is to develop and disseminate agriculturally related
materials and activities that elementary, middle, and sec-
ondary teachers can use to teach academic content, especially
in science and mathematics (Wardlow, 1996). A major ob-
jective of the AgriScience Education Project is to increase stu-
dent achievement and motivation and to enhance both stu-
dents and teachers interest in agricultural sciences and tech-
nologies.
The Aquaponics in the Classroom program is one of the
most successful components of the AgriScience Education
Project. Teachers participating in this program receive a class-
room-scale aquaponics unit, a packet of printed instructional
materials, and a set of student laboratory activities that use
aquaponics as a context for teaching and learning science and
mathematics.
PURPOSE AND OBJECTIVES
The purpose of this paper is to describe the Aquaponics in
the Classroom project. Specific objectives are to:
1. Describe the need for and the development of the pro-
ject
2. Describe the classroom-scale aquaponics unit and in-
structional materials provided to teachers participating
in the project
3. Describe teachers perceptions of the aquaponics unit,
instructional materials, and support provided
Project Description
Aquaponics, the integrated culture of aquatic animals and
plants grown in a soil-less environment, provides an excellent
context for the teaching, learning, and application of acade-
mic content, particularly in science and mathematics.
Aquaponics also serves as an effective context for integrating
the agricultural sciences and technologies into academic
courses. Thus, the AgriScience Education Project at the Uni-
versity of Arkansas has made the infusion of aquaponics into
the school curriculum one of its primary goals.
A prototype classroom-scale aquaponics unit was con-
structed, pilot-tested in two classrooms, and used in science
and mathematics teacher workshops that the authors con-
ducted during 1997 and 1998. Participating teachers expressed
a great deal of interest in the aquaponics unit and associated
instructional materials. However, this interest was somewhat
tempered by the cost of commercially available units (mini-
mum of $1500$2000). The prototype unit was much less ex-
pensive (approximately $350 in materials). However, some
teachers felt they lacked the money, time, equipment, and/or
expertise necessary to build the unit.
To overcome this limitation, 16 aquaponics units were
constructed and made available to teachers on a no-cost, loan
basis. The normal loan period is one semester, but several
teachers have requested extensions and used the units for an
entire academic year. Over the past 3 yr, the 16 units have been
placed in 38 classrooms. The demand for the units has ex-
ceeded supply and a number of teachers are on a waiting list
to receive units. Current plans call for the construction of six
more units to be placed in the 20022003 school year. The pro-
ject-owned aquaponics units have been placed in schools in
Arkansas, Kansas, Oklahoma, and Missouri. Teachers from
across the country have requested information and assistance
in constructing their own units, based on these plans.
56  J. Nat. Resour. Life Sci. Educ., Vol. 31, 2002
Aquaponics Unit and Instructional Materials
In developing the classroom-scale aquaponics unit, five cri-
teria were deemed essential: safety, compactness, quiet oper-
ation, portability, and low-cost. The primary safety concern
was the use of electricity (for motor and lights) in a wet en-
vironment. To enhance electrical safety, a portable ground-
fault circuit interrupter (GFCI) was provided along with each
unit. A compact design was necessary because most of the
units were placed in regular classrooms. As designed, the
unit only required 1.39 m2 (15.0 ft2) of floor space. Quiet op-
eration, essential so that noise from the unit would not inter-
fere with normal teaching and learning activities, was en-
hanced by returning water to the main tank belowwater level.
Portability was enhanced through light-weight, modular con-
struction, which allows the unit be easily assembled, disas-
sembled, and transported. Finally, low cost (approximately
$350) was achieved through the use of commonly available,
inexpensive construction materials.
The primary components of the aquaponics unit (see Fig.
1) are the fish culture tank, biofilter/aerator, plant growth
Fig. 1. Classroom scale aquaponics unit. Note: All structural components are 2.5-cm (1-inch) PVC pipe, unless otherwise noted.
J. Nat. Resour. Life Sci. Educ., Vol. 31, 2002  57
trays, pump and hoses, and support assembly. The fish culture
tank is a 378-L (100-gallon) formed rubber livestock water
tank; the interior was painted swimming pool blue to increase
visibility.
The biofilteraerator is of the packed tower design
(Losordo et al., 1992) and consists of a 76-L (20-gallon) plas-
tic garbage can nested inside a 114-L (30-gallon) plastic
garbage can. The small can, filled with nonsoluble packing
media, has holes drilled in the side and bottom to allow air and
water to flow. Water from the fish tank is pumped to the top
of the biofilteraerator and is dispersed across the packing
media through a perforated plastic tray. Water flows through
the packing media under nonflood conditions and exits into
the large can. An outlet from the large can allows the water
to gravity-flow to plastic hoses going to the hydroponic plant
growth trays or directly back to the fish tank.
The plant growth trays are 1.2-m (4-foot) lengths of vinyl
house gutteringwith end caps. Plants are supported in the trays
using strips of foam board. A 0.15-kW (0.2-hp) submersible
electric pump is used to lift the water from the fish tank to the
biofilteraerator through 1.9-cm (0.75-inch) flexible plastic
tubing. All of the primary structural framework is made from
2.5-cm (1-inch) PVC pipe.
A printed set of instructional materials has been developed
and is provided to each teacher receiving an aquaponics unit.
The materials include introductory information on aquapon-
ics and the aquaponics unit, as well as a series of student lab-
oratory activities (Fig. 2). Example activities include, De-
termining Water Cycle Rate and Determining Feed Con-
version Rate (mathematics); MonitoringNH3, DissolvedO2,
and pHLevels and TheNitrogen Cycle (chemistry); Eval-
uating Pumping Efficiency and Power Factor (physics); and
Plant Structures and Functions (biology). These materials
emphasize the application of mathematics and science to op-
timize an engineered agricultural production system. Thus, the
agricultural sciences and engineering are an integral compo-
nent of the instructional materials.
The development of a single set of instructional materials
that would be applicable to every course would be impossi-
ble. Therefore, in addition to the materials provided, project
staff members consult with participating teachers individually
to help develop activities that integrate the aquaponics unit into
the established curriculum. These teacher contacts provide an
excellent source of ideas for the development of additional ma-
terials.
Teacher Perceptions
Informal feedback from teachers and students, as well as
the numerous requests for additional units, has indicated a high
level of satisfaction with the classroom-scale aquaponics
units. To assess teacher perceptions of the Aquaponics in the
Classroom program, surveys were sent to 10 teachers using
loaner aquaponics units during Spring 1999. The results are
presented in Table 1.
As shown in Table 1, the teachers were extremely positive
in their perceptions of various aspects of the Aquaponics in
the Classroom project. All of the teachers strongly agreed that
their students were interested in the aquaponics unit and that
they would like to keep the aquaponics unit for another year.
The teachers also strongly agreed that they would recom-
mend the aquaponics unit to colleagues. They were satisfied
with the level of support provided by the AgriScience Project
staff, and that their students had asked questions about science
as a result of interacting with the aquaponics unit. The teach-
ers were in moderately strong agreement that having the
aquaponics unit in their classroom provided students with
opportunities for research and to share their experiences rais-
ing plants and fish.
The teachers agreed that the aquaponics unit is used inmy
classroom curriculum. However, they were less likely to
agree that they either used the activities provided by the Agri-
Science Education Project staff or they developed their own
classroom activities involving the use of the aquaponics unit
in the classroom.
Table 1. Teacher perceptions of the classroom-scale aquaponics unit and
materials (n = 10).
Survey statement Mean
My students are interested in the aquaponics unit. 5.0
I would like to keep the aquaponics unit in my room again next year. 5.0
I am happy to have an aquaponics unit in my classroom. 4.8
I would recommend the aquaponics unit to other teachers. 4.8
I am satisfied with the support provided by the AgriScience staff. 4.8
Students have asked science-related questions because of their interaction
with the aquaponics unit. 4.8
Visitors to my classroom, other teachers, or administrators have shown
an interest in the aquaponics unit. 4.8
My students check on the plants and fish on a regular basis. 4.5
Having the aquaponics unit in my classroom has created an opportunity
for student research. 4.5
Students have shared experiences about raising fish or growing plants
while talking about the aquaponics unit. 4.5
The aquaponics unit is used in my classroom curriculum. 4.2
Students have asked questions about fish farming or hydroponics because
of their interaction with the aquaponics unit. 4.0
The booklet Aquaponics in your Classroom has provided most
of the information I needed to use the unit. 4.0
My students have taken pride in the care of the aquaponics unit. 3.8
I have used one (or more) of the activities provided by the AgriScience staff. 3.5
At least one classroom activity that I developed involved the use
of the aquaponics unit. 3.2
 Based on a scale where 1 = strongly disagree, 2 = disagree, 3 = neutral, 4 = agree,
and 5 = strongly agree.
Fig. 2. Elementary school students examine root growth in the soil-less
environment of an integrated aquaculturehydroponics unit. (Photo
courtesy of G.Wardlow andD.M. Johnson, University of Arkansas.)
58  J. Nat. Resour. Life Sci. Educ., Vol. 31, 2002
SUMMARY AND CONCLUSIONS
To integrate the study of science andmathematics with the
agricultural sciences and technologies, a classroom-scale
aquaponics unit was developed for use in elementary, middle,
and secondary classrooms and a set of instructional materials
was developed. Loaner units have been placed in 27 schools
in four states. Participating teachers have been very positive
about the Aquaponics in the Classroom project. However,
more information is needed concerning how teachers and stu-
dents actually use these units and instructional materials to
meet the objectives of their curricula. Interested educators are
encouraged to contact the authors for more information.
REFERENCES
Borko, H., and R.T. Putnam. 1998. The role of context in teacher learning and
teacher education [Online] [36 p.] Available at http://www.contextual.
org/docs/4-BORK1.pdf (accessed 22 June 2000; verified 14May 2002).
U.S. Dep. of Education, Washington, DC.
Hodson, D. 1990. A critical look at practical work in school science. School
Sci. Rev. 71(256):3340.
Losordo, T.M., J.E. Rakocy, and M.P. Masser. 1992. Recirculating aquacul-
ture tank production systems: Component options. Publ. 453. Southern
Regional Aquaculture Center, Stoneville, MS.
National Research Council. 1988. Understanding agriculture: New directions
for education. National Academy Press, Washington, DC.
Wardlow, G.W. 1996. Arkansas agriscience: A planning guide for innovative
decision-making. AgriScience Education Project, Univ. of Arkansas,
Fayetteville, AR.


Enhancing Student Interest in the Agricultural Sciences through Aquaponics

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Enhancing Student Interest in the Agricultural Sciences through Aquaponics

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