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<p>A study was conducted in <i>Channa striata</i> fingerlings for 60 days to study the effect of <i>Schizochytrium limacinum</i> (marine microalga) oil formulated in the diet as a lipid source on the growth performance, feed utilization and physio-metabolic responses. Six practical diets (iso-nitrogenous (40% crude protein) and iso-lipidic (8% lipid) were prepared with three different lipid sources: Fish oil (FO), <i>Schizochytrium limacinum</i> oil (SCO) and sunflower oil (Vegetable oil: VO) in six different combinations. Two hundred seventy fingerlings with an average body weight of 2 ± 0.26 g were randomly distributed in six treatment groups consisting of six practical diets in triplicate at a stocking density of 15 fish per 200-L tank. At the end of the 60-day feeding trial, the fish fed a formulated diet with SCO as a lipid source exhibited the highest (<i>p</i> &lt; 0.05) growth rate, accompanied by a high rate of nutrient utilisation and elevated digestive enzyme activity. Polyunsaturated fatty acids (PUFAs), especially docosahexaenoic acid (DHA) and the ω-3/ω-6 ratio, were highest in the fish fed with SCO. Inclusion of <i>S. limacinum</i> oil has less influence on the liver and muscle superoxide dismutase (SOD) activity compared to other groups; similarly, the liver catalase activity did not vary significantly (<i>p</i> ≥ 0.05) among the groups. The Glucose-6-phosphate dehydrogenase (G6PDH) activity was significantly lower in the group fed SCO. The serum lipid profile, including triglycerides, total cholesterol (TCHO), and high-density lipoprotein (HDL), demonstrates a notable impact on C. striata when different lipid sources are utilized, excluding low-density lipoprotein (LDL). The serum lipid profile, triglyceride, TCHO, and HDL show a significant effect on <i>C. striata</i> with different lipid sources except LDL. Hepatic lipid deposition and cellular vacuolization were observed across all treatments. No histopathological sign or lipid was observed in the intestine of fish fed different lipid sources. Hence, our findings suggest that SCO can be used as an alternative lipid source of FO without compromising the growth and physiological effects in the diet of <i>C. striata</i> fingerling for a period of 60 days.</p>

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Schizochytrium limacinum (marine microalga) oil as lipid source and its effect on growth performance, physio-metabolic changes and hepato-intestinal lipid deposition in freshwater carnivorous fish, Channa striata (Bloch, 1793)

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Thongam Ibemcha Chanu,
  • Parvathi Priya,
  • Nazeema Shamna,
  • Layana Porayil,
  • Madhuri Pathak,
  • Arun Sharma,
  • Abhinaya Pattusamy,
  • Sourav Bhadra

摘要

A study was conducted in Channa striata fingerlings for 60 days to study the effect of Schizochytrium limacinum (marine microalga) oil formulated in the diet as a lipid source on the growth performance, feed utilization and physio-metabolic responses. Six practical diets (iso-nitrogenous (40% crude protein) and iso-lipidic (8% lipid) were prepared with three different lipid sources: Fish oil (FO), Schizochytrium limacinum oil (SCO) and sunflower oil (Vegetable oil: VO) in six different combinations. Two hundred seventy fingerlings with an average body weight of 2 ± 0.26 g were randomly distributed in six treatment groups consisting of six practical diets in triplicate at a stocking density of 15 fish per 200-L tank. At the end of the 60-day feeding trial, the fish fed a formulated diet with SCO as a lipid source exhibited the highest (p < 0.05) growth rate, accompanied by a high rate of nutrient utilisation and elevated digestive enzyme activity. Polyunsaturated fatty acids (PUFAs), especially docosahexaenoic acid (DHA) and the ω-3/ω-6 ratio, were highest in the fish fed with SCO. Inclusion of S. limacinum oil has less influence on the liver and muscle superoxide dismutase (SOD) activity compared to other groups; similarly, the liver catalase activity did not vary significantly (p ≥ 0.05) among the groups. The Glucose-6-phosphate dehydrogenase (G6PDH) activity was significantly lower in the group fed SCO. The serum lipid profile, including triglycerides, total cholesterol (TCHO), and high-density lipoprotein (HDL), demonstrates a notable impact on C. striata when different lipid sources are utilized, excluding low-density lipoprotein (LDL). The serum lipid profile, triglyceride, TCHO, and HDL show a significant effect on C. striata with different lipid sources except LDL. Hepatic lipid deposition and cellular vacuolization were observed across all treatments. No histopathological sign or lipid was observed in the intestine of fish fed different lipid sources. Hence, our findings suggest that SCO can be used as an alternative lipid source of FO without compromising the growth and physiological effects in the diet of C. striata fingerling for a period of 60 days.