Optimizing red claw crayfish, Cherax quadricarinatus rearing tank’s water quality using photosynthetic bacteria for enhanced aquaculture conditions

Anyie, Hannah Heroh (2024) Optimizing red claw crayfish, Cherax quadricarinatus rearing tank’s water quality using photosynthetic bacteria for enhanced aquaculture conditions. [Project Paper] (Submitted)

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Abstract

The treatment of wastewater is an important aspect of environmental management that aims to reduce the negative impact of contaminants discharged into water systems. This study investigates the efficacy of utilizing photosynthetic bacteria for wastewater treatment in the culture of red claw crayfish, Cherax quadricarinatus. Photosynthetic bacteria (PSB) have been proven to purify water and enhance the growth of aquatic organisms as this bacterium are capable of fixing atmospheric nitrogen and converting it into ammonia or related compounds. Photosynthetic bacteria are microorganisms capable of harnessing light energy to facilitate the synthesis of organic compounds through the process of photosynthesis. This process is known as nitrogen fixation. These bacteria play a crucial role in the nitrogen cycle, contributing to the availability of nitrogen compounds for other organisms. Five individuals of red claw crayfish, Cherax quadricarinatus were placed in each treatment and reared for 63 days. The result shows that the there is no significant (p>0.05) between the average ammonia and nitrite distribution for PSB1 (1.9ppm, 0.45ppm), PSB2 (1.7ppm, 0.5ppm), PSB3 (1.7ppm, 1.1ppm) and positive control (1.8ppm, 0.45ppm) but was significantly different (p<0.05) with negative control (4.0ppm, 2.1ppm). The reading was gradually decrease from day 15 and constantly low until the end of the experiment days except for negative. The nitrate distribution shows significantly different between PSB1 (13.75ppm), PSB2 (9.02ppm), PSB3 (13.80ppm), positive (6.1ppm) and negative (20.08ppm). Based on this result, it demonstrated that how PSB can be use as alternative treatments to treat and maintain the water quality in fish rearing tanks. The utilization of cultured PSB in culture systems has the potential to expedite the nitrogen cycle, hence offering a sustainable approach to wastewater treatment. This finding suggests that the PSB treatment demonstrated the bacteria's capacity to use and absorb nutrients, preserving and enhancing the quality of the water. It also demonstrated how alternate treatments, such as cultivated PSB, can be employed to maintain and treat the water quality in fish rearing tanks. The utilization of commercial and cultured bacteria in culture systems has the potential to expedite the nitrogen cycle, hence offering a sustainable approach to wastewater treatment.

Item Type:	Project Paper
Subjects:	S Agriculture > SH Aquaculture. Fisheries. Angling
Faculty:	Faculty of Agriculture and Forestry Sciences
Depositing User:	Mr. Azman Mohamad
Date Deposited:	19 Nov 2025 07:55
Last Modified:	19 Nov 2025 07:55
URI:	http://psaspb.upm.edu.my/id/eprint/2486

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