Effects of <em>Ulva lactuca</em> and <em>Sargassum cinereum</em> supplemented diets on haematological parameters and survival of Koi carp (<em>Cyprinus carpio</em> L.) against bacterial pathogen (<em>Aeromonas</em> species)

• Main Authors: K. G. A. Sudharaka, D. H. N. Munasinghe, W. A. H. P. Guruge, W.P.R. Chandrarathna
• Format: Article
• Language: English
• Published: Faculty of Science, University of Peradeniya, Sri Lanka 2021-06-01
• Series: Ceylon Journal of Science
• Subjects: koi carp, seaweed supplemented diets, haematological parameters, challenge-test, survival
• Online Access: https://cjs.sljol.info/articles/7876
• ISSN: 2513-2814; 2513-230X

The objective of the present study was to determine effects of <em>Ulva lactuca </em>and <em>Sargassum cinereum </em>supplemented diets on some selected blood parameters and survival of fry stage Koi carp (<em>Cyprinus carpio </em>Linnaeus, 1758). Fish were fed <em>Ulva lactuca </em>diet (T₁), <em>Sargassum cinereum </em>diet (T₂) and Control diet (C) for 14 weeks. Haematological parameters were measured at the end of the indoor experiment. Total erythrocyte count (TEC), total leucocyte count (TLC) and thrombocyte count were in the range of 1.44-1.49×10⁶ /mm³, 5.30-6.01<strong>×</strong>10⁴ /mm³ and 2.05-2.48<strong>×</strong>10⁴ /mm³ respectively. Thrombocyte count and TLC in T₁ and T₂ were significantly higher (<em>p</em>&lt;0.05) than the control. A challenge-test was conducted to determine their survival against <em>Aeromonas </em>species. Two treatments (T₁, T₂) and the control (C) were included into experimental setup in triplicates and each treatment consisted with two groups; saline injected and bacteria injected groups. For each replicate eight healthy Koi carps were introduced. It was revealed that survivorship curves and median survival of seaweed supplemented treatments were significantly higher (<em>p</em>&lt;0.05) from C. The highest survival percentage (25%) in the challenge-test was recorded in T₂ at the censored point after 6 hours.