Tag - NH3

The oft-overlooked water quality parameter: pH

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Farmers are aware of the importance of monitoring levels of dissolved oxygen in their production systems and of providing supplemental aeration in intensive fish and shrimp ponds. However, other water quality parameters – as simple as they may look – are often overlooked. One such parameter is pH, which in chemistry refers to a numeric scale used to specify the acid or alkaline condition of an aqueous solutions. In a practical sense, water pH may range from 0 to 14 [...]

9 May
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Aquatic Animal Disease Report

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1. White Spot Disease (WSD) Pathogen: White spot syndrome virus (WSSV) Species affected: Penaeus monodon and Litopenaeus vannamei (10-85 DOC) Name of affected area: reported in 18 provinces (total area 7,279 ha) including Hai Phong, Quang Ninh, Nghe An, Ha Tinh, Quang Tri, Quang Binh, Quang Ngai, Thua Tien Hue, Phu Yen, Binh Dinh, Ho Chi Minh, Long An, Tien Gang, Ben Tre, Tra Vinh, Soc Trang, Bac Lieu and Ca Mau. Mortality rate: average to high, 100% in some cases within 10 d. Clinical signs: lethargic or moribund shrimps aggregated [...]

1 May
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Water Quality Parameter Analysis for the Feasibility of Shrimp Culture

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Muhammad Kasnir et al, Indonesia Moeslim University, Indonesia, carried out physicochemical studies to assess water resource in Mangara Bombang District, South Sulawesi in relation to their potential for shrimp aquaculture use. Introduction Tiger shrimp production in South Sulawesi amounted to about 12599.50 tons in 2007. Nationally, its production was at the fourth ranking after Riau Islands, North Sumatra and West Java [1]. The tiger shrimp production number was the aggregates production in several Regencies which have the coastal area in South Sulawesi Province. One of them is [...]

1 May
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“Black spot” on shrimp

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Regulations prohibit the use of many chemicals and antibiotics in U.S. shrimp aquaculture. The FDA in Silver Spring, MD publishes a list of drugs approved for aquaculture, USFDA URL: http://www.fda.gov/AnimalVeterinary/DevelopmentApprovalProcess/Aquaculture/ucm132954.htm. The main commercial operations in the U.S. claim that they use chemicals and antibiotics responsibly and only when necessary. Although unsubstantiated, this claim is reinforced by limited or no disease occurrences in recent history in the U.S., negating the need for chemical use. Agricultural lime is used to control algal blooms [...]

30 Apr
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A farmer’s perspective on probiotics in shrimp culture

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The application and dosage of probiotics should be culture specific with more clarity and understanding provided to the farmers. For many years, the major focus of the shrimp industry in India was on the farming of the black tiger shrimp, Penaeus monodon. The economic benefits led to high stocking densities and use of spurious post larvae which in turn led to constant threat of diseases. Shrimp farmers began to use of antibiotics and water sanitizers routinely. This indiscriminate use of antibiotics brought [...]

25 Apr
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Better management practices for shrimp farming – Part II

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31. Water is a scarce and very precious natural resource. Try to maximize the efficiency of water utilization. 32. Exchange the water carefully. Do not frequently exchange or in-take the water. 33. During the first month, there should not be any water exchange. Starting the second month, if necessary, water exchange can be done but try to minimize it as much as possible. 34. Release the water when the plankton bloom is too thick i.e., dark green or dark brown water. 35. When [...]

23 Apr
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Better management practices for shrimp farming – Part I

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Over the past few years, better management practices or BMPs have been identified and developed on the scientific basis to protect the environment, to improve the production and economic efficiencies with shrimp farming. These BMPs are also termed as good aquaculture practices. These practices are based on broader and widely accepted international principles for sustainable shrimp farming which is jointly developed by Food and Agriculture Organization of the United Nations, Network of Aquaculture Centres in the Asia Pacific, World Bank, Worldwide Fund for Nature and United Nations Environment Programme. Here are [...]

23 Apr
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