Aged pond is typically refers to a pond that has been used for several cycles without being completely rehabilitated. Aged ponds can have both advantages and challenges when it comes to shrimp cultivation.

•Advantages of Aged Ponds

• Over time, aged ponds develop complex microbial communities. These microbes can help break down organic waste, improving water quality and reducing the buildup of harmful compounds.
• The accumulation of organic matter can lead to a pond rich in nutrients, which can support the growth of natural food sources for the shrimp, such as plankton.

Challenges of Aged Ponds:

Continuous use of the same pond can increase the risk of disease accumulation and transmission. Pathogens and parasites might build up in the pond, posing a higher risk to shrimp health. The sediment in aged ponds can become anaerobic (devoid of oxygen), releasing harmful gases like hydrogen sulfide and ammonia, which are detrimental to shrimp health. Over time, the water quality can degrade due to the accumulation of organic and inorganic matter, requiring more intensive management and potentially more frequent water exchanges. Regularly treating the water with lime or other chemical agents can help maintain pH levels but will not help reduce the impact of toxic compounds and pathogenic bacteria. Completely drying out the pond between cycles can kill harmful pathogens and break down very slightly amount of unwanted organic matter, and this isn't always feasible with back-to-back farming cycles.

Management Techniques

Chain Dragging: 

• Dragging a chain across the pond bottom with AQUAMIMICRY^® Red Cap can help to aerate the sediment and mix the water, reducing the buildup of harmful gases and promoting healthier water conditions.

AQUAMIMICRY® Red Cap:

Introducing beneficial bacteria (probiotics) can help manage the microbial balance in the pond, breaking down harmful organic compounds and improving water quality.

For shrimp farmers, deciding whether to use an aged pond or to dry or rehabilitate a pond between cycles involves balancing these factors, considering both the economic and environmental impacts of each choice.

Microorganisms are of major important in aquaculture. They reside in the sediment and other substrates, and in the water of aquaculture facilities, as well as in and on the cultured species. Microorganisms may have positive or negative effects on the outcome of aquaculture operations. Positive microbial activities include elimination of toxic materials such as ammonia, nitrite, and hydrogen sulfide, degradation of uneaten feed, and nutrition of aquatic animals such as shrimp, fish; production of aqua-farmer. These and other functions make microorganisms key players in the health and sustainability of aquaculture. Yet, microorganisms are among the least known and understood elements in aquaculture. Like other areas in aquaculture, microorganisms require management and manipulation. Process controlled by microorganisms can occur aerobically (in the presence of oxygen) or anaerobically (with no oxygen present). The starting materials and the end products of such processes vary based on the microorganisms' capabilities (as reflected in their genetic makeup), and the environment in which these processes occur (e.g., availability of oxygen, temperature, salinity, pH, etc.

AEROBIC MICROBIAL PROCESSES IN SHRIMP FARMING

Generally, aerobic microbial processes yield compounds which can be beneficial, and are either not toxic or have lox toxicity levels in aquaculture ponds or tanks. Oxidation of organic matter to carbon dioxide, a process which is the main consumer of oxygen in aquaculture ponds or tanks.

Oxidation of ammonia via nitrite, which also consumes large quantity of oxygen. Oxidation of reduced sulphur compounds (such as hydrogen sulfide and element sulfur) to sulfate, a process such that generally has low oxygen demand in aquaculture. Conversion of carbon dioxide to biomass by autotrophic bacteria (such as nitrifying bacteria) with a relatively small amount of biomass produced in aquaculture facilities, when compared to the conversion of carbon dioxide to biomes by algae. 

Conversion of carbon dioxide to biomass by algae depending on the availability of light. Excluding feeding, the photosynthetic process in aquaculture is the main inout of carbon source and natural food for aquatic animals.

ANAEROBIC MICROBIAL PROCESSES IN SHRIMP FARMING

Microbial anaerobic processes, if not controlled, can produce compounds that are highly toxic to cultured animals. 

These processes include:
Consumption of organic matter, without the utilization of free oxygen, resulting in products which are usually not fully oxidized (such as alcohols, organic acids). Reduction of nitrate and nitrite, which can yield either nitrogen gas or ammonia. In aquaculture, due to the toxicity of ammonia and nitrite, ammonia production is not welcomed, while nitrogen gas production is beneficial. However, in agriculture, the opposite is true - the conversion of nitrate and nitrite to nitrogen has result in a loss of fertilizers. Reduction of sulfur compounds to hydrogen sulfide as a final product, a compound, which is toxic to most animals at even very low concentrations.

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