Studies on white spot syndrome (WSS) in penaeid prawns from culture ponds at Cochin, India

Jose, Jasmin K (2001) Studies on white spot syndrome (WSS) in penaeid prawns from culture ponds at Cochin, India. PhD thesis, Central Institute of Fisheries Education, Versova.

[img]
Preview
PDF
53Mb

Abstract

The aquaculture of penaeid shrimp has grown from its experimental beginnings roughly about three decades ago into a major industry which, on a world wide basis, provides employment to hundreds of thousands of both skilled and unskilled labourers, billions of U.S. dollars in revenue and a high quality food product (Lightner and Redman, 1998). Factors, such as, increasing demand and market value, introduction of new technologies in the prawn seed and feed production and other modem culture techniques contribute to this rapid development in the prawn culture industry, which in turn has been accompanied by the appearance of diseases of both infectious and non infectious aetiologies. Though the usage of the terms, prawns and shrimps has been much confusing, in the present study both the terms are used analogously to refer to marinelbrackishwater forms only. The occurrence and relative importance of many of the penaeid diseases coincide with the type of culture system, i.e., extensive, semi intensive and intensive (based on the area of culture, stocking density, feeding and management) practised. The latter two are greatly employed on a commercial scale and hence have more prone to the unhealthy conditions and thereby to various diseases. Many of the important penaeid diseases are caused by organisms, that are part of the normal microflora and fauna of penaeids. These organisms are opportunistic pathogens, that cause diseases only under conditions that favour them over the host (Lightner, 1985, 1993). The important infectious diseases of econoIDIc importance to the cultured prawn are those with viral, rickettsial, bacterial, fungal, protistan and metazoan aetiologies (Lightner, 1988, 1993; Brock and Lightner, 1990; Fulks and Main, 1992; Johnson, 1995). A number of non infectious diseases are also of importance to the industry, which include diseases due to environmental stress, nutritional imbalances, toxicants and genetic factors (Lightner, 1988, 1996; Brock and Lightner, 1990; Brock, 1992; Johnson, 1995). Among all these, viruses are the most important disease causing agents in the penaeid prawns (Lightner, 1985).

Item Type:Thesis (PhD)
Supervisor(s):Rao, G Sudhakara
Uncontrolled Keywords:white spot syndrome; WSS; penaeid prawns; culture ponds; Cochin
Subjects:Aquaculture
Theses
Aquaculture > Farming/Culture
Crustacean Fisheries > Prawn and Prawn fisheries
Fish and Fisheries > Fish Disease
Divisions:CMFRI-Cochin > Marine Capture > Crustacean Fisheries
ID Code:7137
Deposited By:Geetha P Mrs
Deposited On:28 Jan 2011 10:51
Last Modified:20 Jan 2014 13:56

Repository Staff Only: item control page