Effects of Avicennia marina extracts on Labeo rohita (Ham) challenged with Pseudomonas fluorescens

The medicinal plant Avicennia marina was evaluated for their immunostimulatory activity on Pseudomonas fluorescens infested fish, Labeo rohita. The fish was dosed intraperitoneally at 10, 20 and 30 ppm concentrations of ethanolic leaves extract of A. marina and control. After 10, 20 and 30 days of treatments, the immunological, hematological and serum protein level of fish was assessed in control and treatments. All the concentration of plant leaves extract significantly enhanced the agglutination, hematological parameters and total serum protein on 30th days after treatment. The highest agglutination activity was observed in the group treated with 30 ppm concentration of A. marina on 20 days. The WBC, RBC and hemoglobin content was increased with increasing concentration of the treatments. The results, clearly indicates that A. marina leaves extract will be used as immunostimulatory agent to aquaculture for mass production of healthy fish.