The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform
Ryan G Ryswyk - One of the best experts on this subject based on the ideXlab platform.
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length selectivity and size bias correction for the North American Standard gill net
North American Journal of Fisheries Management, 2016Co-Authors: Daniel E Shoup, Ryan G RyswykAbstract:AbstractGill nets are inherently size selective, but selectivity curves can correct this bias. We sampled eight reservoirs with the North American Standard gill net to develop a large length-specific data set for six species: Channel Catfish Ictalurus punctatus, hybrid Striped Bass (White Bass Morone chrysops × Striped Bass M. saxatilis), saugeye (Sauger Sander canadensis × Walleye S. vitreus), Walleye, White Bass, and White Crappie Pomoxis annularis. We then used the SELECT (share each lengthclass’s catch total) method to find the best-fit selectivity model to adjust the gill-net catch for contact selectivity. To determine the magnitude of these selectivity corrections, we compared adjusted and unadjusted length frequencies and size indices for each species at each reservoir. The bimodal model was the best fit selectivity model for all species. When selectivity-adjusted length-frequency data were compared with the original data, one-third of hybrid Striped Bass length frequencies and two-thirds of White ...
David W Willis - One of the best experts on this subject based on the ideXlab platform.
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contact selectivity for four fish species sampled with North American Standard gill nets
North American Journal of Fisheries Management, 2017Co-Authors: Bradley J Smith, Brian G Blackwell, Melissa R Wuellner, Brian D S Graeb, David W WillisAbstract:AbstractThe American Fisheries Society (AFS) has recommended Standard gears and methods for collecting North American freshwater fish data, but selectivity of these gears, including gill nets, is poorly described for most species. We calculated contact selectivity for species commonly collected with AFS Standard gill nets in lakes and reservoirs of North America, including Black Bullhead Ameiurus melas, Channel Catfish Ictalurus punctatus, Walleye Sander vitreus, and Yellow Perch Perca flavescens. The normal selectivity curve provided the best fit to empirical catch data for all species. Inclusion of a tangle factor improved model fit for Black Bullhead, Channel Catfish, and Walleye, indicating that tangling is an important means of capture for these species. Channel Catfish were more susceptible to tangling than the closely related Black Bullhead, likely because larger Channel Catfish are more vulnerable to tangling by spines in the smallest meshes, whereas Black Bullhead in the same meshes were wedged. ...
Daniel E Shoup - One of the best experts on this subject based on the ideXlab platform.
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length selectivity and size bias correction for the North American Standard gill net
North American Journal of Fisheries Management, 2016Co-Authors: Daniel E Shoup, Ryan G RyswykAbstract:AbstractGill nets are inherently size selective, but selectivity curves can correct this bias. We sampled eight reservoirs with the North American Standard gill net to develop a large length-specific data set for six species: Channel Catfish Ictalurus punctatus, hybrid Striped Bass (White Bass Morone chrysops × Striped Bass M. saxatilis), saugeye (Sauger Sander canadensis × Walleye S. vitreus), Walleye, White Bass, and White Crappie Pomoxis annularis. We then used the SELECT (share each lengthclass’s catch total) method to find the best-fit selectivity model to adjust the gill-net catch for contact selectivity. To determine the magnitude of these selectivity corrections, we compared adjusted and unadjusted length frequencies and size indices for each species at each reservoir. The bimodal model was the best fit selectivity model for all species. When selectivity-adjusted length-frequency data were compared with the original data, one-third of hybrid Striped Bass length frequencies and two-thirds of White ...
Bradley J Smith - One of the best experts on this subject based on the ideXlab platform.
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contact selectivity for four fish species sampled with North American Standard gill nets
North American Journal of Fisheries Management, 2017Co-Authors: Bradley J Smith, Brian G Blackwell, Melissa R Wuellner, Brian D S Graeb, David W WillisAbstract:AbstractThe American Fisheries Society (AFS) has recommended Standard gears and methods for collecting North American freshwater fish data, but selectivity of these gears, including gill nets, is poorly described for most species. We calculated contact selectivity for species commonly collected with AFS Standard gill nets in lakes and reservoirs of North America, including Black Bullhead Ameiurus melas, Channel Catfish Ictalurus punctatus, Walleye Sander vitreus, and Yellow Perch Perca flavescens. The normal selectivity curve provided the best fit to empirical catch data for all species. Inclusion of a tangle factor improved model fit for Black Bullhead, Channel Catfish, and Walleye, indicating that tangling is an important means of capture for these species. Channel Catfish were more susceptible to tangling than the closely related Black Bullhead, likely because larger Channel Catfish are more vulnerable to tangling by spines in the smallest meshes, whereas Black Bullhead in the same meshes were wedged. ...
Amal Amarti - One of the best experts on this subject based on the ideXlab platform.
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Pure choriocarcinoma of the testis presenting with jaundice: a case report and review of the literature
Journal of Medical Case Reports, 2012Co-Authors: Mustapha Ahsaini, Fadl Tazi, Soufiane Mellas, Jallaledine Elammari, Abdelhak Khalouk, Roos E Stuurman-wieringa, Mohammed Jamal Elfassi, My Hassan Farih, Hind Elfatmi, Amal AmartiAbstract:Introduction Testicular cancer is the most common malignancy in men 15- to 35-years-old. The North American Standard classification divides testicular cancers into germ cell tumors and non-germ cell tumors. The lymphatic spread of germ cell tumors usually involves the retroperitoneal lymph nodes. However, this spread to the retroperitoneum rarely involves the hepatic hilum. We describe an unusual case of metastatic choriocarcinoma of the testis that was clinically mimicked by a cholestatic jaundice. This is an unusual presentation of testicular cancer and, to the best of our knowledge, the first report of this kind in the literature.
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Pure choriocarcinoma of the testis presenting with jaundice: a case report and review of the literature
Journal of Medical Case Reports, 2012Co-Authors: Mustapha Ahsaini, Fadl Tazi, Soufiane Mellas, Jallaledine Elammari, Abdelhak Khalouk, Roos E Stuurman-wieringa, Mohammed Jamal Elfassi, My Hassan Farih, Hind Elfatmi, Amal AmartiAbstract:Introduction Testicular cancer is the most common malignancy in men 15- to 35-years-old. The North American Standard classification divides testicular cancers into germ cell tumors and non-germ cell tumors. The lymphatic spread of germ cell tumors usually involves the retroperitoneal lymph nodes. However, this spread to the retroperitoneum rarely involves the hepatic hilum. We describe an unusual case of metastatic choriocarcinoma of the testis that was clinically mimicked by a cholestatic jaundice. This is an unusual presentation of testicular cancer and, to the best of our knowledge, the first report of this kind in the literature. Case presentation A 28-year-old Moroccan man presented with a four-week history of progressive obstructive jaundice, and weight loss to our emergency department. Abdominal ultrasound showed a dilatation of the biliary ducts due to pathologically enlarged lymph nodes of the hepatic hilum. A complete clinical and radiologic assessment to discover the primary tumor was negative except for pulmonary metastasis. In the laboratory findings at admission there were signs of cholestasis with an abnormal increase in the rate of testicular tumor markers (serum beta-human chorionic gonadotropin level was 11,000IU/ml), which subsequently led to the suspicion of a testicular tumor. Further evaluation included testicular palpation and ultrasound which revealed a testicular nodule. The patient underwent an inguinal orchidectomy of the right testis and histopathological examination confirmed a pure choriocarcinoma. The prognosis was poor due to lymph node involvement at the hepatic hilum. He died one month later, despite general chemotherapy. Conclusions The clinical presentation of the disease and the rarity of this entity are two remarkable characteristics described in this case report which are rarely reported in literature.