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Study on the Effect of Aquaculture-drugs and Chemicals on Health and Production of Prawn (macrobrachium Rosenbergii) in Narail, Bangladesh

Md. Tawhid Hasan
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Gias Uddin Ahmed
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Mamunur Rahman
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Mohammad Nurul Alam
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

The present study was carried out to evaluate the effect of aquaculture-drugs and chemicals on health and production of prawn in Narail district. Data were collected through questionnaire interview, market survey and focus group discussion from June to December 2014. Six categories and 28 types of chemicals were found in the chemical shops as well as used by the farmers. Chemicals used in pond preparation, equipment disinfection, oxygen supplementation, growth promotion, antibiotics and disease treatment. Eco-solution, malachite green and melathion were used in the treatment of viral diseases having 85%, 70% and 65% recovery respectively. Potassium permanganate, oxytetracycline and renamycine had 86%, 80% and 75% recovery respectively against protozoan and bacterial diseases. Clinically prawn appeared normal greenish in control ponds, whereas, in chemical treated prawn appeared yellowish brown and grayish color. Histology of muscle of control prawn were almost normal except some vacuums, however, chemical treated prawn muscle had remarkable pathological changes like necrosis, vacuums and pyknotic cells. Prawn production was 85 kg/acre in control ponds, 150 kg/ acre in lime-urea treated ponds and 450 kg/ acre in chemical treated ponds.

Keywords: Aquaculture- drugs; Chemicals; Effect; Production; Recovery

Location: Narail Sadar upazilla namely Gobra, Khalishakhali, Barcula, Arpara, Mirjapur, Tularampur, Shitarampur, Chandirpur, Mulia and Bicali

Start Date: 00-06-2014

End Date: 00-12-2014

Program Area: Animal Health and Management

Commodity: Prawn

Objectives:

To evaluate the effect of aquaculture-drugs and chemicals on health and production of prawn in Narail district

Methodology:

The present study was carried out in 10 villages of Narail Sadar upazilla namely Gobra, Khalishakhali, Barcula, Arpara, Mirjapur, Tularampur, Shitarampur, Chandirpur, Mulia and Bicali from June to December 2014. Data were collected through questionnaire interview, personal contact, participatory rural appraisal (PRA) and focus group discussion (FGD) with fish farmers, drug sellers and different fisheries associations. For questionnaire interview a set of questionnaire was prepared of both closed and open form. Three types of questionnaires were prepared. The effect of different aquaculture-drugs and chemicals were measured through the farmer’s opinion and the production was compared between culture systems using chemicals and without chemicals. Health status was verified through laboratory analysis in addition with the field observations. Prawn was examined clinically through observation of gross signs, abnormality, lesion, erosion, erratic movement, color and spots on body. Samples for histological examination were taken from muscle and cuticle and fixed in 10% neutral buffer formalin. The samples were then arranged in steel rack and dehydrated, cleared and infiltrated in an automatic tissue processor. The samples were then embedded with molten wax, steel mold and perforated plastic holder. Trimming were done from side and surface of the blocks with the help of scalpel and a micro tome respectively. The blocks were then sectioned at 5-7 micrometer by the micro tome machine. The sections were then stained with haematoxylin and eosin stains. After staining the sections were mounted with Canada balsam and covered by cover slips. Photomicrographs of the stained sections were done by using photo microscope.

Source of Information: Asian J. Med. Biol. Res. 2015, 1 (1), 89-94, ISSN: 2411-4472.

Article Link (Online Journal): www.ebupress.com/journal/ajmbr

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Farmers used different types of aquaculture-drugs and chemicals for prawn health and production. Farmers used eco-solution, malachite green and melathion for the treatment of viral diseases which had 85%, 70% and 65% recovery respectively. Potassium permanganate, oxytetracycline and renamycine having 86%, 80% and 75% recovery respectively against protozoan and bacterial diseases. From histological section of prawn muscle there were found some remarkable pathological changes like necrosis, hemorrhage, pyknotic cell and viral inclusion bodies in chemical treated ponds, whereas, some vacuums were observed in control ones. Prawn production was 85 kg/acre in control ponds, 150 kg/ acre in lime-urea treated ponds and 450 kg/ acre in chemical treated ponds. Bangladesh aquaculture has been influenced by aquaculture-drugs and chemicals which had positive effect on prawn production and disease recovery, on the other hand, some remarkable pathological changes were observed in prawn organs from chemical treated ponds. So the use of aquaculture-drugs and chemicals in ponds and ghers should be reduced in order to overcome adverse pathologies in shrimp organs.

Knowledge Management: Journal