Volume 15, Issue 3 (Autmn 2025)
J. Aqua. Eco 2025, 15(3): 45-56 |
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Ebrahimzadeh Kouchesfahani N, Khoshkholgh M, Falahatkar B. Enrichment of chironomidae larvae with different levels of vitamin C and its effect on growth performance of Oscar (Astronotus ocellatus). J. Aqua. Eco 2025; 15 (3) :45-56
URL: http://jae.hormozgan.ac.ir/article-1-1142-en.html
URL: http://jae.hormozgan.ac.ir/article-1-1142-en.html
Abstract: (46 Views)
Vitamin C is an essential micronutrient in teleost fish, contributing to growth, immune function, and the prevention of skeletal deformities. Therefore, identifying effective strategies to deliver this nutrient through the food chain is of particular importance. This study evaluated the effects of enriching chironomid larvae with different levels of vitamin C on the growth performance of Oscar (Astronotus ocellatus). Larvae were reared under five enrichment treatments containing 0, 250, 500, 750, and 1000 mg vitamin C per kilogram of poultry manure. After 10 days of rearing at 25.87 ± 0.62 °C, the maximum larval biomass reached 83.17 g/m², and the greatest individual length and weight were 1.52 cm and 7.79 mg, respectively. However, larval growth indices did not differ significantly among treatments (p > 0.05). In the feeding trial, Oscar juveniles (initial mean weight: 0.26 ± 0.01 g) were fed the enriched larvae for 14 days at 27.1 ± 0.51 °C. Fish fed larvae enriched with 750 and 1000 mg vitamin C showed significant increases in final weight, weight gain, specific growth rate (weight), daily weight gain, condition factor, and body weight increase compared to the control (p < 0.05). Additionally, larvae enriched with 1000 mg vitamin C uniquely produced the highest specific growth rate (length) and daily length gain. Overall, while vitamin C enrichment did not influence chironomid larval growth, its use as a live feed markedly enhanced both weight- and length-related growth performance in Oscar juveniles without affecting survival.
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This work is licensed under a Creative Commons — Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)