THE AQUARIUM – Guttenberg, Iowa
The Aquarium is at the Upper Mississippi River Fisheries Station. Featured there are fish common to the areas such as walleye, northern pike, sunfish, blue gill, and bullheads.
Tour the DNR Aquarium. Have students ask the biologist questions from their Field Trip Activity Booklet brainstormed prior to the field trip.
Observe the spawn harvest if the field trip is scheduled for the appropriate time.
In their Field Trip Activity Booklets, have students list the names of fish they observe at the aquarium. Compare this list to those they have actually seen or caught.
Make a videotape of the field trip experience.
Each year in late March or early April, northern pike and walleye spawn. At this time fishery personnel begin their search for brood stock to produce enough eggs, and resulting fry (new born fish) and fingerlings, to stock Iowa lakes and streams. Iowa fishery personnel have targeted the northern pike that move into shallow backwater areas of the Mississippi River as the brood stock of choice. A three-person crew from the Guttenberg Management Station place up to 30 trap nets in the river pools 10 and 11 to collect brood fish for spawning operations. The goal of the crew is to collect about 60 adult females and 180 adult males for every one million eggs needed for hatchery production. The usual goal is to collect up to three million eggs. All northerns collected are transported to the basement of the Guttenberg Management station. Free flowing eggs are stripped from females and then sperm from 3 to 5 males is added to each liter of eggs amassed. About 65,000 northern pike eggs constitute a liter. A saltwater solution is then added to the egg and sperm mixture to activate fertilization. Up to three liters of eggs will be placed into hatching jars and the eggs will incubate for about five days before they begin to "eye-up" and a total of nine days before they hatch. Females without free flowing eggs are injected with a hormone derived from carp pituitary glands. The natural hormone stimulant induces egg release. After hatching, some 50,000 fry are placed into water-filled plastic bags. Oxygen is added and the bags are sealed for transport to rearing ponds at Fairport Hatchery or they are stocked directly into selected waters. Stocked areas include segments of the Cedar, Iowa, Maquoketa, Shellrock, Wapsipinicon and Winnegago Rivers. Lakes stocked include Arrowhead, Badger, Beeds, Blue, Browns, Clear, Crystal, Diamond, George Wyth, Little Wall, Macbride, North Twin, Saylorville, Silver, Snyer Bend and Sweets Marsh.
Admission – None
Directions – The DNR Aquarium is located at 331 S. River St., Guttenberg; The Aquarium is located one block south of Lock and Dam No. 10.
Hours – 8:00 a.m. – 4:30 p.m., daily, May — September
Credit Cards – None
Phone – (319) 252-1156