| Abstract: | Electronarcosis, the immobilization of a fish after an electric current has been applied and discontinued, is a potential alternative to chemical anesthetics. Successful narcosis was defined as the immobilization of a fish for 1-15 min without causing physical damage. In the laboratory, AC successfully narcotized juvenile (13-19-cm standard length, SL) northern pike (Esox lucius) at selected voltages; however, AC voltages that produced narcosis or resulted in physical damage were variable and unpredictable. In contrast, 60-90-V pulsed DC (PDC) for 10-60 s successfully narcotized juvenile pike without inducing physical damage. Duration of narcosis was directly related to voltage and inversely related to fish length. In the hatchery, sexually mature northern pike (45-97 cm SL), collected from the Mississippi River, were successfully narcotized by 60-V PDC for 10 s. Duration of narcosis was unrelated to fish length or sex, and averaged 58 plus or minus 7 s (mean plus or minus SE). This allowed sufficient time to collect eggs or milt. All fish were swimming upright within 3 min after treatment, and no mortalities were observed over the next 24 h. Survival of eggs from fertilization to eye- up did not significantly differ between eggs collected from electronarcotized adults and adults anesthetized with MS-222 (tricaine methanesulfonate). Electronarcosis represents a possible alternative to chemical anesthetics for immobilizing northern pike broodstock without an apparent impact on egg survival. |
| Genre: | Article |
| ProdID: | 1003056 |
| Citation Author: | Walker, M. K.; Yanke, E. A.; Gingerich, W. H. |
| Citation Contributing Office: | Upper Midwest Environmental Sciences Center |
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| Citation End Page: | 243 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Progressive Fish-Culturist |
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| Citation Number Of Pages: | 7 |
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| Citation Phsyical Description: | pp. 237-243 |
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| Citation Publisher: | National Biological Service |
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| Citation Search Results Text: | Use of electronarcosis to immobilize juvenile and adult northern pike; 1994; Article; Journal; Progressive Fish-Culturist; Walker, M. K.; Yanke, E. A.; Gingerich, W. H. |
| Citation Start Page: | 237 |
| Citation Volume: | 56 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Use of electronarcosis to immobilize juvenile and adult northern pike; 1994; Article; Journal; Progressive Fish-Culturist; Walker, M. K.; Yanke, E. A.; Gingerich, W. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | National Biological Service |
