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Effect of Aqua-drugs and Chemicals on Shrimp Health and Production in Khulna, Bangladesh

MD. JAHID HOSSAINom
Department of Aquaculture, Khulna Agricultural University, Daulatpur 9202, Khulna, Bangladesh

M. MAMUNUR RAHMAN
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh,

SHAHRINA AKHTAR
Department of Environment Science and Management, Independent University of Bangladesh, Dhaka

MD. MAMNUR RASHID
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh,

GIAS UDDIN AHMED
Corresponding author:
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh,

Abstract/ Executive Summary:

Present study was conducted in three different Upazilas viz., Batiaghata, Dacope and Rupsha of Khulna district, Bangladesh from August 2016 to May 2017. Data were collected through personal contact, farms and market survey and discussion with shrimp farmers and drug sellers. Farmers of the research areas used Oxolinic acid, Renamucin, Oxytetracucline, Lime, Salt, Formalin, Eco-solution, Basudin and Timsen to treat the viral, bacterial and fungal diseases. Average recovery of 55-60% and 35-40% were recorded from bacterial and fungal diseases of shrimp respectively, but there was no recovery in case of viral diseases. Shrimps of nontreated ghers were affected by WSSV, Black gill disease, Black spot disease, Zoothumnium and external fouling but almost no disease were observed in aqua drugs-treated ponds. Histological findings showed that shrimp muscles and hepatopancreas in drug treated ponds and ghers had some pathological changes like necrosis, vacuums and hemorrhages which were severe in winter season, whereas, normal structure of muscle and hepatopancreas were observed during summer season. Production of shrimp in the study areas was recorded 6916 Kg/ha in probiotics and aqua-drugs treated ponds, whereas, 543 Kg/ha in nontreated ghers. From the present study it could be concluded that aqua-drugs and chemicals have positive effect on shrimp health and production except some pathological changes in the investigated organgs of shrimp especially during winter season.

Keywords: Aqua-drugs, Shrimp health, Khulna region

Location: Dacope and Batiaghata in Khulna district and Rupsha in Bagherhat district, Bangladesh

Start Date: 00-08-2016

End Date: 00-05-2017

Program Area: Animal Health and Management

Commodity: Aqua Drugs, Shrimp, Diseases

Objectives:

To focus aqua drugs and chemicals on shrimp health especially disease treatment and production through clinical, histological and general field perception in Khulna region.

Methodology:

Study area: The study was carried out from August 2016 to May 2017. The sampling locations were Dacope and Batiaghata in Khulna district and Rupsha in Bagherhat district. These areas were selected as they contribute substantially to shrimp production, where aqua drug sellers and representatives of pharmaceutical companies were frequent. Data collection: Data were collected through questionnaire interview with shrimp farmers, market survey and retailers of aqua-drugs and chemicals. For questionnaire interview a set of questionnaires was prepared which was composed of both closed and open form of questions. Individual interviews were carried out from the farmers through randomly personal contact. A total of 40 farmers (12 to 15 farmers from each sampling areas) were personally interviewed. A sum of 29 drug sellers was interviewed with 8 to 5 drug sellers and traders from each area. Sample collection: The samples were collected from the field level. Clinical signs of the shrimps were examined by naked eye to observe any injury, infection and other abnormal conditions of the shrimp body. For histological observation, samples of hepatopancreas and muscle collected farm wise and season wise. Muscle samples were collected from the middle portion of shrimp and fixed in Devidson fixative and kept in transparent plastic vials. Then samples were dehydrated, cleaned and infiltration through an Automatic Tissue Processor (SHADON, Citadel 1000), sectioned and stained with hematoxylin and eosin. The sections were examined under a compound photomicroscope.

Source of Information: Bangladesh J. Fish. (2021) 33(1) : 89-97

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was observed that, there was distinct effect of aqua-drugs and chemicals on health and production of shrimp in coastal aquaculture of Bangladesh. Through clinical observations, it could be mentioned that, shrimps were affected in non-treated ghers and ponds in study area and disease free were found in most of the treated farms. However, in histological observations, shrimp muscles and hepatopancreas in drug-treated ghers had pathological changes like necrosis, vacuums and hemorrhages. Whereas, almost normal structure except some vacuums and necrosis were observed in shrimp of non-treated ghers. The highest production of shrimp in probiotics and drug treated ponds were recorded as 6916 kg/ha, whereas, it was 543 kg/ha in non-treated ghers. From the present study, it could be stated that, Bangladesh aquaculture has been influenced by aqua-drugs and chemicals which had positive impacts on aquaculture production and disease recovery. However, some pathological changes were observed in shrimp organs where aqua drugs and chemicals were applied. Thus care should be taken on use of aqua drugs; if possible doses and quantitis of drugs for diseases should be reduced. In coastal regions the recorded diseases of shrimp were WSD, YHD, External Fouling, MBVD, Black gill disease and Bacterial diseases. Farmers obtained 15-20% recovery by using potassium permanganate, Eco solution, Methylene blue, Basudin and Timsen on YHD and obtained 55-60% recovery by using Renamycin, Oxytetracycline, Lime, Salt, and Potassium permanganate for the treatment of bacterial diseases. From histological observations shrimp muscle had pathologies like hemorrhage, vacuum, necrosis in mentioned organs in aqua-drugs treated ponds. The highest production of shrimp in probiotics and drug treated ghers were recorded 6916 kg/ha, whereas, 543 kg/ha in non-treated ghers. Thus it could be concluded that aqua-drugs and chemicals played significant role on shrimp health and production in coastal regions of Bangladesh

Knowledge Management: Journal