The effects of different feeding times and diets on the whole body fatty acid composition of goldfish (Carassius auratus) larvae
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Abstract In this study, the effects on whole body fatty acid levels of goldfish larvae (Carassius auratus) caused by different feeding times T(1–4) and diets D(1–3) were investigated during the early larval stages which is the first 15 days’ of feeding. Fatty acid levels for all experimental groups were found to be: 1.54 to 3.45% for myristic acid, 17.57 to 22.68% for palmitic acid, 28.81 to 41.16% for total saturated fatty acids-∑SFA, 2.37 to 4.04% for palmitoleic acid, 13.79 to 39.21% for oleic acid, 22.60 to 47.59% for total monounsaturated fatty acids-∑MUFA, 3.62 to 7.69% for linolenic acid-ALA, 0.35 to 1.11% for arachidonic acid-ARA, 7.50 to 9.76% for total n-6 fatty acids-∑ n-6, 1.04 to 2.28% for linoleic acid-LA, 0.81 to 2.52% for eicosapentaenoic acid-EPA and 5.56 to 10.28% for docosahexaenoic acid-DHA. The total n-3 acids-∑ n-3, total polyunsaturated fatty acids-∑PUFA, PUFA/SFA ratio, ∑ n-6/∑ n-3 and DHA/EPA ratio of the experimental groups were determined to be 7.24 to 14.83%, 14.73 to 23.46%, 0.47 to 0.73, 0.58 to 1.04 and 3.21 to 8.7, respectively. In conclusion, the whole body fatty acid levels of goldfish larvae (Carassius auratus) determined in this study revealed the significant effects of different feeding times (T1–4) and different diets (D 1–3) using (P < 0.05).Keywords:
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Intensive grow-out of goldfish, Carassius auratus (L.), larvae and juveniles in closed systems requires the control of environmental conditions and feeding. This study investigates the use of different types of live food and combinations of live food and dry food in a series of four rearing experiments. Juvenile goldfish can be weaned from Artemia onto live food at about 24 days after the onset of feeding without causing a reduction in growth and survival. The replacement of Artemia by Daphnia at day 10 appears feasible, as growth and survival were not significantly affected. Fish fed decapsulated Artemia cysts grew better than fish fed live Artemia. Within the first 14 days, goldfish juveniles should be fed at least 155 cysts per fish per day to achieve fast growth and to minimize size variation.
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Abstract Goldfish Carassius auratus L., larvae were raised on a diet of yeast, rice flour, vitamins and a lipid source consisting of 10% of either canola oil (CAN) or cod liver oil (COD) or a mixture of 5% of each (MIX). Survival of larvae raised on CAN or MIX diets was comparable to that of larvae raised on COD diets. In longer-term experiments, growth was superior and development more rapid in larvae receiving the COD diet.
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Serum cortisol from serially sampled goldfish (Carassius auratus) did not demonstrate a stress-evoked increase (P >.05) until 10–22 min after initial capture. This response did not differ (P > 0.5) among fish sampled at the beginning, middle, and end of a 12-h light period.
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Abstract In this study, the effects on whole body fatty acid levels of goldfish larvae (Carassius auratus) caused by different feeding times T(1–4) and diets D(1–3) were investigated during the early larval stages which is the first 15 days’ of feeding. Fatty acid levels for all experimental groups were found to be: 1.54 to 3.45% for myristic acid, 17.57 to 22.68% for palmitic acid, 28.81 to 41.16% for total saturated fatty acids-∑SFA, 2.37 to 4.04% for palmitoleic acid, 13.79 to 39.21% for oleic acid, 22.60 to 47.59% for total monounsaturated fatty acids-∑MUFA, 3.62 to 7.69% for linolenic acid-ALA, 0.35 to 1.11% for arachidonic acid-ARA, 7.50 to 9.76% for total n-6 fatty acids-∑ n-6, 1.04 to 2.28% for linoleic acid-LA, 0.81 to 2.52% for eicosapentaenoic acid-EPA and 5.56 to 10.28% for docosahexaenoic acid-DHA. The total n-3 acids-∑ n-3, total polyunsaturated fatty acids-∑PUFA, PUFA/SFA ratio, ∑ n-6/∑ n-3 and DHA/EPA ratio of the experimental groups were determined to be 7.24 to 14.83%, 14.73 to 23.46%, 0.47 to 0.73, 0.58 to 1.04 and 3.21 to 8.7, respectively. In conclusion, the whole body fatty acid levels of goldfish larvae (Carassius auratus) determined in this study revealed the significant effects of different feeding times (T1–4) and different diets (D 1–3) using (P < 0.05).
Carassius auratus
Fish larvae
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