article · Animals
This study investigated how different dry feed diets, specifically soybean, yeast, rice bran, and corn starch, affect the marine copepod Oithona nana. Researchers examined their impact on population growth, growth rate, population composition, fecundity, and fatty acid profiles over 15 days. Corn starch proved most effective for enhancing population growth and growth rate. However, rice bran significantly improved the copepods' nutritional value, leading to higher monounsaturated and polyunsaturated fatty acids, lower saturated fatty acids, and the unique presence of C20:5ω3. Rice bran also resulted in the highest female fecundity and percentages of copepodites and nauplii. The findings suggest that dry feeds, especially corn starch, are highly applicable in hatcheries to maximise O. nana density and fecundity.
Oithona nana is a crucial live feed in marine aquaculture. Understanding how different diets affect its growth and nutritional content allows for optimising its mass production. This research provides practical insights for improving the efficiency and sustainability of hatchery operations, ultimately benefiting the cultivation of other marine species.
This research offers applied findings for marine hatcheries and aquaculture organisations. The identified dry feed diets, particularly corn starch for growth and rice bran for nutritional enrichment and fecundity, can be directly implemented to optimise the mass culture of Oithona nana. This work is near-market, providing practical protocols for improving live feed production efficiency and nutritional quality in commercial settings.
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The marine copepod species <i>Oithona nana</i> is considered as one of the most successfully mass cultured Cyclopoida species in marine hatcheries. This study investigated the effects of four feed diets (soybean, yeast, rice bran, and corn starch) on the population growth, growth rate, population composition, fecundity, and fatty acid composition of native isolated Cyclopoida copepod species <i>O. nana</i>. The experiment was continued for 15 days and the copepods were fed on one of the four diets with a concentration of 1 g 10<sup>-6</sup> individual day<sup>-1</sup>. The results revealed that corn starch was found to be the most supportive diet for population growth and population growth rate. For nutritional value, copepods fed on rice bran were detected to have the highest content of MUFA, PUFA, and the lowest SFA and SFA/UFA ratio; more importantly, the rice bran diet was the only treatment that showed C20:5ω3. Moreover, copepods fed on rice bran showed the highest significant female fecundity, copepodite, and nauplii percent. Finally, the protocols described in the current study concluded that the dry feeds, especially corn starch, are very useful and applicable in hatcheries for maximizing the fecundity and density of Cyclopoida copepod species, <i>O. nana</i>.
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DOI: 10.3390/ani11051188
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