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Fresh Fisheries and Aquaculture Information

In these times of economic uncertainty, are you thinking about raising your own baitfish? Maybe you're planning to forget about the turmoil during a relaxing fishing weekend. If so, you might be interested in the new or freshened information from the Minnesota Sea Grant Web site!

Parasites of Freshwater Fish
Aquaculture Potential for Redtail Chubs

The redtail chub is one of the most valuable baitfish species in Minnesota. Developing an economically successful aquaculture system for raising these fish could relieve the harvesting pressure on wild populations while keeping baitstores supplied with this feisty fish. Minnesota Sea Grant offers facts, figures, and visual lessons that could influence your interest and success in the baitfish business.

Go to www.seagrant.umn.edu/aquaculture/redtail to download an economic model developed by Sea Grant's Jeff Gunderson and Nik Hassan, Associate Professor of Management Information Systems at the Labovitz School of Business and Economics, University of Minnesota Duluth. Created in the spreadsheet program Excel, the model and its accompanying User Guide will allow you to simulate aquaculture potential.

For a lighter view of baitfish aquaculture, the Web site also contains a short video showing a slice of a redtail's reproductive life.

Rusty Crayfish: A Nasty Invader
Rusty Crayfish: A Nasty Invader

Would you know a rusty crayfish if it pinched you? Much to the detriment of submerged vegetation and native crayfish, the aggressive crustacean has invaded portions of Minnesota, Wisconsin, and Ontario.

You can learn how to identify the beast, and even tell the sex of a crayfish by reading Jeff Gunderson's recently updated fact sheet, Rusty Crayfish: A Nasty Invader. This publication and its earlier versions have been on Minnesota Sea Grant's list of "top 10 most popular Web pages" for months. See why at: www.seagrant.umn.edu/ais/rustycrayfish_invader.

People preferring a printed copy can order one for free from here.

Parasites of Freshwater Fish
Parasites of Freshwater Fish

Because they are easily seen, flukes (a.k.a. grubs or Trematods) are the most commonly reported parasites living on fish. Common flukes in Minnesota fish are yellow grub, black grub (a.k.a. black spot) and white grub; they all rely on birds, snails, and fish to help them to complete their life cycles. In addition to these commonly seen flukes, leeches, copepods, tapeworms, and a variety of other organisms can parasitize fish. Nearly all fish have parasites and nearly all fish parasites can be consumed by humans without negative consequences.

However, the broadfish tapeworm (Diphyllobothrium latum) can cause problems. People in Minnesota have been infected with this tapeworm after consuming marinated, uncooked walleye and northern pike. In one incident, anglers marinated freshly caught fish overnight in lemon juice and ate them the next day. They were following a recipe for seviche, a South American dish. It is advisable to thoroughly cook or hot smoke all fish to an internal temperature of 140 F or freeze them at 0 F for 48 hours.

Information about fish parasites in Minnesota can be found along with supporting images on the Minnesota Sea Grant fisheries Web page: www.seagrant.umn.edu/fisheries.

By Sea Grant Staff
April 2009

Return to April 2009 Seiche

This page last modified on March 01, 2018     © 1996 – 2019 Regents of the University of Minnesota     The University of Minnesota is an equal opportunity educator and employer.
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