Performance of Herbal Extracts on Diseased Fish

Abstract

An experiment was conducted for a period of 28 days to observe the effect of plant extracts on recovery of fish diseases. The experiment was carried out in mini pond (1.75 decimal) behind the Fisheries Faculty in BAU, Mymensingh. Twelve hapas (3 ×2 ×1.5 sq.ft.) and five studies were conducted with control hapa with 3 treatments and two replicates each. Four medicinal plant products were collected and prepared. In study 1 fishes were treated with Neem Seed Oil, study 2 with Kalojira Seed Oil, study 3 with Neem Leaf Extract, study 4 with Mahogoni Seed Oil and the control hapa was provided with normal feed. The treatments were practiced as 2ml, 4ml and 6ml per kg feed. At the beginning of the experiment, fishes had red spots on dorsal and caudal region, scale missing, large abrasions and black to grayish spots. In Kalojira Seed Oil (study 2) treated fish, spots and lesions were totally recovered in T2 and T3 whereas in T1 there were traces spots at the end of the experiment. However, in Neem Seed Oil and Neem Leaf fine extract treated fish (study 1 and study 3), injury, abrasions and lesions were almost healed up in T3 (6ml/kg feed) and moderate recovery in T2 and T1. In Mahogoni Seed Oil (study 4) treated fish, ulcers and lesions were reduced in size but existed distinctly in all the treatments at the end of the experiment. In control study (study 5) injury and abrasions had no recovery but remained almost similar till the end of experiment. Thus it was found that Kalojira Seed Oil performed best recovery (90-95%) followed by Neem Seed Oil (78-84%), Neem Leaf fine extract (70-75%) and poor performance was observed with Mahogoni Seed Oil extract (35-40%). So, kalojira seed oil was the best performed herb and T3 (6ml/kg feed) was the best dose followed by T1 and T2.

Chemical Profiling and Biological Activity of Extracts from Nine Norwegian Medicinal and Aromatic Plants

“…Phytogenic feed additives have gained interest due to antioxidant and antimicrobial properties, and some compounds have been found with healing properties against a wide range of fish pathogens including bacteria and parasites [ 5 , 6 , 7 , 8 ]. Several plant species are recognised for these activities like sweet wormwood ( Artemisia annua ), peppermint ( Mentha piperita ), thyme ( Thymus vulgaris ), marjoram ( Origanum majorana ), oregano ( Origanum vulgare ), yarrow ( Achillea millefolium ), and hops ( Humulus lupulus ) [ 9 , 10 ].…”