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The use of biomarkers for assessing effects of pollutant stress on fish species from a tropical river in Southeastern Brazil Biological Sciences
Morado, Claudio Nona; Araújo, Francisco Gerson; Gomes, Iracema David.
Biomarkers are measurements within an organism that respond to environmental effects and are used as tools in bioassessment programs since they reflect physiological changes induced by exposure to pollutants. The hepatosomatic index (HSI) and the condition factor (CF) in three fish species Geophagus brasiliensis, Hypostomus affinis and Hypostomus auroguttatus were used to assess effects of pollutant stress in a tropical river during two seasons (dry and wet). Fish from the least disturbed sites had the lowest condition factor (CF) and the lowest HSI, whereas those from sites near pollutant discharges had the highest CF and HSI. Higher HSI and lower CF occurred during the dry season. It is suggested that species adapted to stressful conditions take...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0 Ecologia condition factor; Hepatosomatic index; Fishes; Monitoring; Rivers. Ecologia de peixes.
Ano: 2017 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34293
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การเสริม Schizochytrium sp. ในอาหารต่อการเจริญเติบโต และอัตราการรอดตายในปลานิลรุ่น Thai Agricultural
Soudsada Saiyasaeng; Bundit Yuangsoi; Sutee Wongmaneeprateep.
Effects of Schizochytrium sp. on growth performance and survival rate of Nile tilapia, Oreochromis niloticus, juveniles were studied. Fish (initial weight 2.27-2.30 g) were fed with commercial pellet feed (32% crude protein) supplemented with Schizochytrium sp. at 0 (control group), 2.5, 5.0 and 7.5% for 8 weeks. The result showed that average weight gain of the 7.5, 5.0 and 2.5% Schizochytrium sp. supplemented were 37.84+1.227, 32.81+0.648 and 31.17+0.226 g, respectively, which were significantly different (P<0.05) from the control group (28.11+2.393 g). The Schizochytrium sp. supplemented fish had the average daily growth rate was significantly higher (P<0.05) than the control group but there was no statistically significant difference among...
Tipo: PhysicalObject Palavras-chave: Nile tilapia; Oreochromis niloticus; Schizochytrium; Microorganisms; Dietary supplementation; Omega 3; Growth performance; Survival rate; Hepatosomatic index; HSI; Feed formula; Thraustochytrids; ปลานิล; จุลินทรีย์ทะเล; การเสริมอาหาร; โอเมก้า 3; อัตราการเจริญเติบโต; อัตรารอดตาย; ค่าดัชนีตับ; สูตรอาหารสัตว์น้ำ; ปริมาณอาหารที่ได้รับ.
Ano: 2013 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5776
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