| Abstract: | The external metamorphosis of the sea lamprey was divided into four stages, based primarily on the condition of the mouth: mouth reduced, mouth fused, mouth enclosed, and mouth elongated. During metamorphosis, the eye enlarged greatly, the snout and mouth region changed from a fleshy hood enclosing a sieve apparatus to a large sucking disc, the nasopore membrane and the branchial area shrank, the branchiopores changed in shape, the general color changed from dark brown and yellow to an intense blue-black dorsally and white ventrally, and the total length increased. Metamorphosis began in early to mid-July and did not take place after August. The duration of external metamorphosis was about 3 months for lampreys transforming under natural conditions. The mean lengths of metamorphosing lampreys from tributaries of lakes Superior and Michigan were 145 and 136 mm, respectively. |
| Genre: | Article |
| ProdID: | 1000260 |
| Citation Author: | Manion, Patrick J.; Stauffer, Thomas M. |
| Citation Contributing Office: | Great Lakes Science Center |
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| Citation End Page: | 1746 |
| Citation Issue: | 10 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of the Fisheries Research Board of Canada |
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| Citation Number Of Pages: | 11 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | p. 1735-1746 |
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| Citation Public Comments: | Out-of-print |
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| Citation Search Results Text: | Metamorphosis of the landlocked sea lamprey, Petromyzon marinus; 1970; Article; Journal; Journal of the Fisheries Research Board of Canada; Manion, Patrick J.; Stauffer, Thomas M. |
| Citation Start Page: | 1735 |
| Citation Volume: | 27 |
| Citation Year: | 1970 |
| Type: | citation/reference |
| Text: | Metamorphosis of the landlocked sea lamprey, Petromyzon marinus; 1970; Article; Journal; Journal of the Fisheries Research Board of Canada; Manion, Patrick J.; Stauffer, Thomas M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1970 00:00 -0600 |
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