| Abstract: | Gillnet selectivity for lake trout (Salvelinus namaycush) was estimated indirectly from catches in nets of 102-, 114-, 127-, 140-, and 152-mm stretch measure. Mesh selectivity was modeled as a nonlinear response surface that describes changes in the mean, standard deviation, and skewness of fish lengths across mesh sizes. Gillnet selectivity for lake trout was described by five parameters that explained 88% of the variation in wedged and entangled catches, 81% of the variation in wedged catches, and 82% of the variation in entangled catches. Combined catches of wedged and entangled lake trout were therefore described more parsimoniously than separate catches of wedged and entangled lake trout. Peak selectivity of wedged and entangled fish increased from 588 to 663 mm total length as mesh size increased from 102 to 152 mm, and relative selectivity peaked at a total length of 638 mm. The estimated lake trout population size-frequency indicated that gillnet catches were negatively biased toward both small and large lake trout. As a consequence of this bias, survival of Lake Superior lake trout across ages 9-11 was underestimated by about 20% when the catch curve was not adjusted for gillnet selectivity. |
| Genre: | Article |
| ProdID: | 1000738 |
| Citation Author: | Hansen, Michael J.; Madenjian, Charles P.; Selgeby, James H.; Helser, Thomas E. |
| Citation Contributing Office: | Great Lakes Science Center |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 2490 |
| Citation Issue: | 11 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Canadian Journal of Fisheries and Aquatic Sciences |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 7 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | p. 2483-2490 |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Gillnet selectivity for lake trout (Salvelinus namaycush) in Lake Superior; 1997; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Hansen, Michael J.; Madenjian, Charles P.; Selgeby, James H.; Helser, Thomas E. |
| Citation Start Page: | 2483 |
| Citation Volume: | 54 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Gillnet selectivity for lake trout (Salvelinus namaycush) in Lake Superior; 1997; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Hansen, Michael J.; Madenjian, Charles P.; Selgeby, James H.; Helser, Thomas E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
| Publisher: | |
