The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
A R Deacon - One of the best experts on this subject based on the ideXlab platform.
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Steatitis in wild sharptooth catfish clarias gariepinus burchell in the olifants and lower letaba rivers in the kruger national park south africa
Journal of Fish Diseases, 2011Co-Authors: Karl David August Huchzermeyer, Dhanashree Govender, Daniel J Pienaar, A R DeaconAbstract:Large numbers of adult Nile crocodiles, Crocodylus niloticus (Laurenti), died from panSteatitis during autumn and winter 2008 in the lower Letaba and Olifants River gorge in the Kruger National Park, South Africa. Consequently, the health status of fish from these waters was investigated. The study presents the pathological findings in fish inhabiting these rivers within the boundaries of the Park. Changes typical of Steatitis were diagnosed in many of the larger specimens of sharptooth catfish, Clarias gariepinus (Burchell), caught within the Olifants River gorge. These fish carried large amounts of mesenteric fat with characteristic small brown granulomata within the adipose tissue. Necrosis and inflammation of the adipose tissues, with characteristic ceroid accumulation within the resultant granulomata and the associated aggregation of ceroid-containing macrophages, were demonstrated histologically and were typical of Steatitis. Other changes included mild thickening and pallor of the gill tissues and swollen, orange, fatty livers. Focal hepatic lipidosis was demonstrated histologically, and special stains revealed storage of large amounts of iron in the livers. Blood smears revealed chromatin clumping in erythrocyte nuclei and nuclear and cell membrane irregularities. This is the first record of Steatitis in wild-caught C. gariepinus.
John A Bowden - One of the best experts on this subject based on the ideXlab platform.
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a histological evaluation of panSteatitis affected mozambique tilapia oreochromis mossambicus peters 1852 from different geographical locations in south africa
Journal of Fish Diseases, 2020Co-Authors: Joseph R Sara, Wilmien J Luuspowell, Susan B Fogelson, Hannes Botha, Theresa C Guillette, Willem J Smit, Andre Hoffman, Katlego D Kunutu, Jeremy P Koelmel, John A BowdenAbstract:PanSteatitis is the leading cause for the decline in Nile crocodile populations and the sporadic mortality of fish in the Olifants River System, South Africa. To determine the prevalence of this disease in lentic systems, Mozambique tilapia, Oreochromis mossambicus, were collected from Lake Loskop, Lake Flag Boshielo, Phalaborwa Barrage and Lake Luphephe-Nwanedi. The former three impoundments are located within the main stem of the Olifants River, while the latter, which is geographically isolated and situated in the Limpopo River System, served as a reference site. Mesenteric adipose, liver, serosa of the swim bladder, gill and the skeletal muscle of fish sampled were examined for gross and microscopic evidence of panSteatitis. Microscopically observed changes were used to statistically compare panSteatitis prevalence between samples and sites. Based on histopathological evaluation, the adipose tissue in the liver, swim bladder serosa and coelom from severely debilitated individuals showed the most significant pathological changes. Lesions indicative of Steatitis were observed in fish collected from Lake Loskop (75%), Lake Flag Boshielo (22%) and Lake Luphephe-Nwanedi (15%). Further investigation is warranted to understand the pervasiveness and mechanisms driving pathological changes of panSteatitis at Lake Flag Boshielo, Phalaborwa Barrage and Lake Luphephe-Nwanedi.
Karl David August Huchzermeyer - One of the best experts on this subject based on the ideXlab platform.
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Steatitis in wild sharptooth catfish clarias gariepinus burchell in the olifants and lower letaba rivers in the kruger national park south africa
Journal of Fish Diseases, 2011Co-Authors: Karl David August Huchzermeyer, Dhanashree Govender, Daniel J Pienaar, A R DeaconAbstract:Large numbers of adult Nile crocodiles, Crocodylus niloticus (Laurenti), died from panSteatitis during autumn and winter 2008 in the lower Letaba and Olifants River gorge in the Kruger National Park, South Africa. Consequently, the health status of fish from these waters was investigated. The study presents the pathological findings in fish inhabiting these rivers within the boundaries of the Park. Changes typical of Steatitis were diagnosed in many of the larger specimens of sharptooth catfish, Clarias gariepinus (Burchell), caught within the Olifants River gorge. These fish carried large amounts of mesenteric fat with characteristic small brown granulomata within the adipose tissue. Necrosis and inflammation of the adipose tissues, with characteristic ceroid accumulation within the resultant granulomata and the associated aggregation of ceroid-containing macrophages, were demonstrated histologically and were typical of Steatitis. Other changes included mild thickening and pallor of the gill tissues and swollen, orange, fatty livers. Focal hepatic lipidosis was demonstrated histologically, and special stains revealed storage of large amounts of iron in the livers. Blood smears revealed chromatin clumping in erythrocyte nuclei and nuclear and cell membrane irregularities. This is the first record of Steatitis in wild-caught C. gariepinus.
Daniel J Pienaar - One of the best experts on this subject based on the ideXlab platform.
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panSteatitis of unknown etiology associated with large scale nile crocodile crocodylus niloticus mortality in kruger national park south africa pathologic findings
Journal of Zoo and Wildlife Medicine, 2013Co-Authors: Emily P Lane, Johan Christian Abraham Steyl, Dhanashree Govender, Daniel J Pienaar, Fritz W Huchzermeyer, Roy Bengis, Peter Buss, Markus Hofmeyr, Jan G Myburgh, Antoinette KotzeAbstract:Annual mortality events in Nile crocodiles (Crocodylus niloticus) in the Olifants River Gorge in Kruger National Park, South Africa, were experienced between 2008 and 2012, during which at least 216 crocodiles died. Live crocodiles were lethargic. Necropsy examination of 56 affected crocodiles showed dark yellow-brown firm nodules in both somatic fat and the abdominal fat body. In all of the 11 crocodiles submitted for histology, degenerative, necrotic, and inflammatory changes supported a diagnosis of Steatitis in both fat types. Crocodiles are apex predators in this anthropogenically changed aquatic ecosystem that is used by humans upstream and downstream from the park for domestic, agricultural, fishing, and recreational purposes. This pathologic review of panSteatitis in crocodiles in the Olifants River system was part of a broad multidisciplinary research program. To date, no definitive causative agent has been identified. Epidemiologic evidence suggests that this event may have been a one-time event with long-standing repercussions on the health of the crocodiles. Pathologic findings are rarely documented in wild crocodilians. This study also reports on other conditions, including the presence of coccidian oocysts, capillarid and filaroid nematodes, digenetic trematodes, and pentastomes.
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Steatitis in wild sharptooth catfish clarias gariepinus burchell in the olifants and lower letaba rivers in the kruger national park south africa
Journal of Fish Diseases, 2011Co-Authors: Karl David August Huchzermeyer, Dhanashree Govender, Daniel J Pienaar, A R DeaconAbstract:Large numbers of adult Nile crocodiles, Crocodylus niloticus (Laurenti), died from panSteatitis during autumn and winter 2008 in the lower Letaba and Olifants River gorge in the Kruger National Park, South Africa. Consequently, the health status of fish from these waters was investigated. The study presents the pathological findings in fish inhabiting these rivers within the boundaries of the Park. Changes typical of Steatitis were diagnosed in many of the larger specimens of sharptooth catfish, Clarias gariepinus (Burchell), caught within the Olifants River gorge. These fish carried large amounts of mesenteric fat with characteristic small brown granulomata within the adipose tissue. Necrosis and inflammation of the adipose tissues, with characteristic ceroid accumulation within the resultant granulomata and the associated aggregation of ceroid-containing macrophages, were demonstrated histologically and were typical of Steatitis. Other changes included mild thickening and pallor of the gill tissues and swollen, orange, fatty livers. Focal hepatic lipidosis was demonstrated histologically, and special stains revealed storage of large amounts of iron in the livers. Blood smears revealed chromatin clumping in erythrocyte nuclei and nuclear and cell membrane irregularities. This is the first record of Steatitis in wild-caught C. gariepinus.
Dhanashree Govender - One of the best experts on this subject based on the ideXlab platform.
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panSteatitis of unknown etiology associated with large scale nile crocodile crocodylus niloticus mortality in kruger national park south africa pathologic findings
Journal of Zoo and Wildlife Medicine, 2013Co-Authors: Emily P Lane, Johan Christian Abraham Steyl, Dhanashree Govender, Daniel J Pienaar, Fritz W Huchzermeyer, Roy Bengis, Peter Buss, Markus Hofmeyr, Jan G Myburgh, Antoinette KotzeAbstract:Annual mortality events in Nile crocodiles (Crocodylus niloticus) in the Olifants River Gorge in Kruger National Park, South Africa, were experienced between 2008 and 2012, during which at least 216 crocodiles died. Live crocodiles were lethargic. Necropsy examination of 56 affected crocodiles showed dark yellow-brown firm nodules in both somatic fat and the abdominal fat body. In all of the 11 crocodiles submitted for histology, degenerative, necrotic, and inflammatory changes supported a diagnosis of Steatitis in both fat types. Crocodiles are apex predators in this anthropogenically changed aquatic ecosystem that is used by humans upstream and downstream from the park for domestic, agricultural, fishing, and recreational purposes. This pathologic review of panSteatitis in crocodiles in the Olifants River system was part of a broad multidisciplinary research program. To date, no definitive causative agent has been identified. Epidemiologic evidence suggests that this event may have been a one-time event with long-standing repercussions on the health of the crocodiles. Pathologic findings are rarely documented in wild crocodilians. This study also reports on other conditions, including the presence of coccidian oocysts, capillarid and filaroid nematodes, digenetic trematodes, and pentastomes.
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Steatitis in wild sharptooth catfish clarias gariepinus burchell in the olifants and lower letaba rivers in the kruger national park south africa
Journal of Fish Diseases, 2011Co-Authors: Karl David August Huchzermeyer, Dhanashree Govender, Daniel J Pienaar, A R DeaconAbstract:Large numbers of adult Nile crocodiles, Crocodylus niloticus (Laurenti), died from panSteatitis during autumn and winter 2008 in the lower Letaba and Olifants River gorge in the Kruger National Park, South Africa. Consequently, the health status of fish from these waters was investigated. The study presents the pathological findings in fish inhabiting these rivers within the boundaries of the Park. Changes typical of Steatitis were diagnosed in many of the larger specimens of sharptooth catfish, Clarias gariepinus (Burchell), caught within the Olifants River gorge. These fish carried large amounts of mesenteric fat with characteristic small brown granulomata within the adipose tissue. Necrosis and inflammation of the adipose tissues, with characteristic ceroid accumulation within the resultant granulomata and the associated aggregation of ceroid-containing macrophages, were demonstrated histologically and were typical of Steatitis. Other changes included mild thickening and pallor of the gill tissues and swollen, orange, fatty livers. Focal hepatic lipidosis was demonstrated histologically, and special stains revealed storage of large amounts of iron in the livers. Blood smears revealed chromatin clumping in erythrocyte nuclei and nuclear and cell membrane irregularities. This is the first record of Steatitis in wild-caught C. gariepinus.
