Effect of dietary supplementation of crude microalgal extracts on growth performance, survival and disease resistance of Lates calcarifer (Bloch, 1790) larvae

Gora, Adnan and Ambasankar, K and Sandeep, K P and Rehman, Saima and Agarwal, Deepak and Ahamad, Irshad and Ramachandran, K (2019) Effect of dietary supplementation of crude microalgal extracts on growth performance, survival and disease resistance of Lates calcarifer (Bloch, 1790) larvae. Indian Journal of Fisheries, 66 (1). pp. 64-72.

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    Abstract

    The present study aimed to assess growth performance and health status of Lates calcarifer larvae fed with crude microalgal extracts. Larvae weighing 5.96 ± 0.39 mg were randomly divided into four experimental groups in triplicates, with each replicate having 35 larvae. Four diets formulated to contain 55% protein and 12% lipid, were prepared with pigment rich microalgal extracts at 0% (T1) and 1% each of crude phycocyanin (T2), chlorophyll (T3) and astaxanthin (T4) extracts. The experiment was carried out in 30 l plastic tanks by feeding experimental diets to satiation. There was no significant difference (p<0.05) in growth performance in larval groups fed different experimental diets. Percentage survival during the feeding experiment was significantly higher in the astaxanthin fed group (77.14±1.65) and lower in chlorophyll fed group (36.19±0.95) compared to control group. Cannibalism (%) was significantly reduced in the treatments fed astaxanthin (7.61±0.95) and phycocyanin (8.57±0.3) pigmented diets compared to chlorophyll fed group (13.33±0.95) and control group. Bacterial challenge with pathogenic Vibrio alginolyticus revealed highest resistance in astaxanthin and phycocyanin fed larvae. The study confirms that astaxanthin and phycocyanin at 1% dietary levels improve survival and disease resistance in Asian seabass larvae but do not affect growth performance.

    Item Type: Article
    Uncontrolled Keywords: Astaxanthin, Chlorophyll, Larval feed, Lates calcarifer, Microdiets, Phycocyanin
    Subjects: Food and Feeding
    Aquaculture > Seabass
    Eggs and Larvae
    Divisions: CMFRI-Madras (Chennai)
    Depositing User: Arun Surendran
    Date Deposited: 04 Apr 2019 04:54
    Last Modified: 04 Apr 2019 04:54
    URI: http://eprints.cmfri.org.in/id/eprint/13608

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