Prevalence of Mud crab reovirus (MCRV) in open pen and cage aquaculture system

Author:

Nivas Naveen1,Gopalakrishnan Ayyaru2,Kaippilly Dinesh1,Srav Savva2,John Anisha Shafni2,Dayalane Saranya2,Dhasarathan Balu2

Affiliation:

1. Kerala University of Fisheries and Ocean studies

2. Annamalai University

Abstract

Abstract Mud crab farms along the east coast of India have been facing mysterious mass mortality for the past few years. Recently, Mud crab reovirus was found to be responsible for this mortality in the east coast of India. This study investigated the mortality rate of mud crabs raised in an open-pen and cage environment in relation to mud crab reovirus infection. The crabs were cultured in open pens, cages within the pens, and cages outside the pens i-e in open water without any enclosures. The dead and moribund crabs were tested for etiological agents responsible for the mortality using histopathology, TEM and RTPCR. The mortality rate in the open pen culture system was found to be 73 ± 4.57%, whereas the mortality rate in cages inside the pen was found to be 18 ± 2.21%, and in cages outside the pen in open water was found to be 17.3%. Mud crab cannibalistic behavior was found to be the primary rationale for the higher MCRV transmission rate in open pens where the crabs are not separated, contrary to the cage culture technique. The present study revealed that rearing mud crabs in cage crabs in individual cages decreases the mortality rate of mud crabs up to 20 percent. Therefore, fattening or culturing mud crabs in cages benefits farmers with higher survival rates and economic performance.

Publisher

Research Square Platform LLC

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