Utilization of vermi extract for health management in common carp (Cyprinus carpio Linn.) for sustainable aquaculture
Loading...
Date
2013
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
The fisheries sector contributes significantly to the Indian agricultural economy. Massive fish mortalities
have been observed in different countries due to bacterial, fungal, viral and protozoan diseases and resulting in heavy economic losses have been reported. Bacteria, the major group of pathogens, pose one of the most
significant threats to successful fish production throughout the world. Extracting and using biologically active
compounds from earthworms has traditionally been practiced by indigenous people throughout the world.
Earthworms have been used in medicine for various remedies. The aim of this work is to contribute towards
utilization of vermi extract for health management in common carp, Cyprinus carpio for sustainable aquaculture.
Total eight bacterial strains were isolated from diseased common carp. In the present investigation,
various earthworm species viz. Eisenia fetida, Eudrilus eugeniae, Perionyx excavatus and Pheretima posthuma were used as medicine for dieases remedies by using antimicrobial well diffusion assay. It was found that all the earthworm species showed antibacterial activity against isolated bacteria. The maximum zone of inhibition observed by Eisenia fetida against Aeromonas hydrophila followed by Eudrilus eugeniae, Perionyx excavatus and Pheretima posthuma repectively. To study the effectiveness of earthworm extract of most efficient earthworm species against fish diseases, studies were conducted under in vivo conditions. Fish were fed with earthworm extract incorporated diet alongwith supplymentary feed gave best results in terms of growth, percent survivality and haematological parameters. In the present study, we also examined the antimicrobial efficacy of G- 90 glycolipoprotein tissue homogenate extract from Eisenia fetida. Assays of tissue homogenates of earthworm (Eisenia fetida) have revealed that glycolipoprotein mixture referred to as G-90 that is composed of macromolecules with medical and pharmaceutical applications. There are several functions attributed to G-90: possession of several growth factors. G-90 can also act as antioxidant, exert antimicrobial activities in vitro and found that G-90 showed antibacterial activity against isolated bacteria but maximum zone of inhibition observed against Aeromonas hydrophila. Thus, earthworm extract might be considered as a new antimicrobial agent suitable for use in aquaculture practices.
Description
Keywords
bacteria, biological phenomena, extraction, diseases, pathogens, fruits, irrigation, land management, enzymes, application methods