World Aquaculture Society Meetings


Your browser does not support the most current secure communications protocol. The World Aquaculture Society is committed to the security of your private information. In order to accept credit card data on this site we are recquired to be in compliance with Payment Card Industry (PCI) standards. Current PCI standards will not allow us to accept traffic from browsers that do not support TLS 1.2 after June 30, 2018. We are alerting you to the important need to update your browser. Changes to our web server made on or before June 30, 2018 will make unavailable with the browser you are currently using. [More..]

Add To Calendar 29/04/2016 08:50:0029/04/2016 09:10:00Africa/JohannesburgAsian-Pacific Aquaculture 2016SEDIMENT INDUCED ACIDIFICATION OF SHRIMP CULTURE PONDS: CONSEQUENCES AND IMPACTS
Diamond 3The World Aquaculture Societyjohnc@was.orgfalseanrl65yqlzh3g1q0dme13067DD/MM/YYYY


J.M.P.K. Jayasinghe*
Faculty of Livestock Fisheries and Nutrition,
Wayamba University of Sri Lanka,
Makandura, Gonawila, Sri Lanka

Due to continued pressure on land resources, highly pyritic soils have been converted to coastal aquaculture activities. Sediment induced acidification is considered as a major technical and environmental problem in coastal shrimp culture in ponds constructed in acid sulphate soils.

Technical constraints of utilization of pyritic sediments include acidification of pond soil and pond water, poor natural productivity in ponds, slow growth of culture organisms, low production, higher water temperatures, low turbidity and poor fertilizer response.

Health related problems of cultured shrimps identified in these ponds are deposition of hydrated iron oxides on exoskeleton and clogging of gill lamellae, deposition of higher incidences of soft shell syndrome and black/brown gill syndrome and high mortality during heavy rains after prolonged dry spells. Shrimps cultured are more vulnerable to infections.

In addition higher concentrations of nutrients, metabolic toxic end products, and suspended solids of normal farm effluents, shrimp ponds on pyritic sediments release highly acidic effluents with higher concentrations of soluble iron, manganese and aluminum.  Discharges during pond conditioning are heavily loaded with iron oxides and are with very low pH. Several short term and long term environmental consequences have been identified in coastal areas due to reclamation of pyritic soils for shrimp farming. However, specific impacts on biodiversity and fishery resources are yet to be assessed.

Key words: shrimp culture, pyritic sediments, shrimp health, environment.

Copyright © 2001-2018 World Aquaculture Society All Rights Reserved.