Enrichment of <i>Artemia</i> (Leach) nauplii with Canola Oil: Effect on <i>Heros severus</i> (Heckel) Larvae Performance and Environmental Stress

Abstract

The effect of canola oil enriched Artemia (Leach) nauplii on growth, survival, resistance to environmental stresses of temperature and oxygen deficiency and fatty acid composition in severum fish, Heros severus (Heckel), larvae were investigated. The larvae (average weight 3 mg ± 0.83) were fed 4 times daily starting at the onset of exogenous feeding for 18 days. Triplicate groups of fish were offered one of two treatments: 1) newly hatched Artemia (Leach) nauplii (unenriched) and 2) canola oil enriched Artemia (Leach) nauplii. Then all groups of fish were switched to the commercial diet for an additional period of 18 days. Statistical analysis of growth after 18 days and at the end of the experiment (36 days), showed that the highest specific growth rates (9.65% ± 0.3), (17.44% ± 0.31) the average weight (17 mg ± 0.95), (65.2 mg ± 0.53) were observed in treatment 2 respectively, but there was no significant difference in survival rate between treatments. The best result of resistance to oxygen deficiency (5 min) was observed in larvae reared on treatment 2 with 75.67% ± 0.66 after 36 days. Result of temperature stress showed no significant difference between treatments. The larvae were also found to convert n-3 fatty acids to EPA and DHA.

Palm Oil-Based Enriched Diets for the Rotifer, Brachionus plicatilis, Improved the Growth of Asian Seabass (Lates calcarifer) Larvae

“…The study reported that the POME significantly enhanced the rotifer production, and improved growth and survival. Concordant findings were also obtained on other plant oil-based enriched live foods for different species (Smith et al, 2004;Menoyo et al, 2007;Huanng et al, 2008;Hafezieh et al, 2010;Tehrani et al, 2014;Kazemi et al, 2016). The morphological features (phenotypic characters), CF and TL/W ratio that are normally used as indicators of nutritional status of fish larvae showed that the Asian seabass larvae were developing normally based on the consistent pattern in all the treatment groups.…”

The Art of Aquarium Keeping Communicates Science and Conservation

“…This includes diseases associated with aquatic organisms (Whittington and Chong, 2007;Lawson et al, 2015), invasive species release (Padilla and Williams, 2004;Delaney et al, 2008;Howeth et al, 2016;Bandaranayake and Chandrasekara, 2017;Magalhães et al, 2017;Selwyn et al, 2017;Tuckett et al, 2017) and use for popular aquarium species for breeding and scientific research (Hoff, 1996;Moe, 2003;Moorhead and Zeng, 2010;Olivotto et al, 2011;Domínguez and Botella, 2014;Tehrani et al, 2014). Another, far less common focus for research includes the human dimensions of the aquarium trade and hobby.…”