Research Article

Market Status and Uses of Aqua-Drugs and Chemicals in Aquaculture at Lakhsmipur, Bangladesh

Shyamal Kumar Paul¹*, Fahad Chowdhury¹, M. Maksud Alam², Priyanka Rani Majumdar¹ and Md. Robiul Hasan¹

¹Department of Fisheries and Marine Science, Noakhali Science and Technology University, Bangladesh

²Deputy Secretary, Ministry of Science and Technology, Bangladesh Secretariat, Dhaka, Bangladesh

Submission:April 01, 2021; Published:May 20, 2021

*Correspondence author: Shyamal Kumar Paul, Department of Fisheries and Marine Science, Noakhali Science and Technology University, Sonapur, Noakhali, Bangladesh

How to cite this article: Shyamal K P, Fahad C, M. Maksud A, Priyanka Rani M, Md. Robiul H. Market Status and Uses of Aqua-Drugs and Chemicals in 002 Aquaculture at Lakhsmipur, Bangladesh. Oceanogr Fish Open Access J. 2021; 13(4): 555869 DOI:10.19080/OFOAJ.2021.13.555869

Abstract

In order to investigate the present status of commercial aqua drugs and chemicals in the local market and their uses on fish health management. A questionnaire survey was carried out for eight months from August 2016 to March 2017 in three upazillas under the district of Lakhsmipur, Bangladesh. Data were collected through questionnaire interview, personal contact, market survey, Participatory Rural Appraisal like Focus Group Discussion with fifteen fish farmers, fifteen retailers of aqua chemical shops, nine representatives of different pharmaceuticals companies in Lakhsmipur sadar upazilla, Raipur upazilla and Ramgoti upazilla. Nine categories of aqua drugs and chemicals were identified in the study area. In the study region, 22 companies were found to be supplying different 51 aqua drugs (under nine categories) in the local market, with ten companies supplying around 79 percent of the goods. Timsen > Virex>Oxyflow> Renamycin and Aquamycine > Ossi C >Aqua Boost > Aqua Photo> Ammonil> Geolite gold were the most widely used aqua drugs in the district of Lakhsmipur, Bangladesh. In Lakhsmipur Upazilla, found 27 aqua drug and chemicals which were available in the market and mostly used of Aqua Photo and Ammonil (9%) and Oxyflow, Aqua boost, Virex, Timsen (7%). The farmers in Raipur Upazilla are found to use 36 aqua medicines and chemicals. Aqua Photo, Oxyflow, and Ammonil were used in 7% of the cases; Biozyme, Aqua Boost, Ossi C, grow fast, gastrap, Geolite gold, and Rotenone were used in 4% of the cases; and Bio-pH was used in 3% of the cases. According to the report, there are 24 different types of aqua drugs and chemicals found in Ramgoti Upazilla. Ammonil has been used in 11% of the cases, while Aqua Boost and Charger gel are used in 6% of the cases. In the investigated area, various types of diseases such as Dropsy, EUS (epizootic ulcerative syndrome), red spot and different parasitic diseases were found to occur in Pangus (Pangasianolan hypophthalmus), Tilapia (Oreochromis nilotica), Sharputi (Puntius sarana), Rui (Labeo rohita), Mrigal (Cirrhinus mrigala), Thai koi (Anabas testudineus), Shing (Heteropneustes fossilis). Susceptible months of disease outbreak in the study area were August, November, December, January, February, and March. During the field observation, many issues with aqua-drugs were discovered, including farmers' lack of understanding of drug application, an insufficient withdrawal time, and some negative effects on fish and human health.

Keywords:Aqua drug; Fish health management; Market status; Fish farmer; Aqua chemicals

Introduction

Freshwater aquaculture in Bangladesh primarily consists of pond aquaculture, especially polyculture of both native and exotic species; coastal aquaculture, on the other hand, primarily consists of shrimp farming. Aquaculture production systems in Bangladesh are mostly extensive and extended extensive, with some semi-intensive and, in a few instances, intensive systems. Aquaculture is the world's fastest-growing food-producing industry, growing at a rate faster than any other animal-based food-producing sector. It has been extended, diversified, intensified, and technologically advanced in Bangladesh as well. In Bangladesh, with the growth of aquaculture, there has been a growing trend in the use of aqua-medicines. Aqua-medicine has only recently been introduced in order to meet the growing demand in aquaculture [1]. Chemicals in aquaculture can be categorized based on their intended use, the form of species being cultured, the life cycle stage for which they are used, the culture method, the strength of the culture, and the people who use them [2].

Aqua-medicines are used by farmers for a variety of purposes, including pond building, health management, soil and water management, enhancement of natural aquatic productivity, transportation of live organisms, feed formulation, manipulation and enhancement of reproduction, and growth promotion.

To ensure proper fish health care, drugs and chemicals are used extensively in aquaculture. There are many reasons for using drugs in aquaculture, including reducing the entry of pathogenic organisms into the culture field, reducing the proliferation of pathogenic organisms, reducing the stressful condition on fish health, reducing, or preventing disease outbreaks, and treating disease [3]. Lime, rotenone, various inorganic and organic fertilizers, salt, dipterex, antimicrobials, potassium permanganate, copper sulphate, formalin, sumithion, melathion, and other chemicals are widely used in Bangladesh aquaculture [4].

About 400 aqua-medicine are now produced by 100 pharmaceuticals in Bangladesh. Various type of those aqua-medicine was marketed by innumerable company which were used in aquaculture activities like as water quality management, improve dissolve oxygen, growth promoter, antibiotics, and disinfectants. Farmers have used these substances as a disinfectant to prevent contamination and/or pathogen in their pond. A host of antibiotics, pesticides and other chemicals have been used to prevent and manage infections and likely to produce antibiotic-resistant bacteria, persistence of pesticides and other substances harmful to aquatic ecosystems and to create human health threats. The emphasis of international aquaculture is therefore on how the ecological environment of aquaculture can be improved. Now, in aquaculture, researchers are attempting to use probiotic bacteria to enhance the water quality by balancing bacterial populations in water and reducing pathogens [5]. This latest approach (ecological aquaculture) is increasingly given to researchers and has taken a significant step forward. The indiscriminate application of aqua drugs or chemicals also leads to problems such as drug resistance, tissue residue, adverse biodiversity effects on the animal, human and environmental effects.

Many of these things are well known [6]. The export of shrimp from Bangladesh has also been prohibited [7]. The ban placed the shrimp export industry in the country under severe pressure and caused major market disturbances that had already recovered with the required actions. Most farmers do not have the proper doses and application to cause ecologic degradation in some areas to the extent that water quality is inadequate for aquaculture [8]. Farmers without understanding their effectiveness had been aware of the application of these aqua medicines. This creates serious problems in the aquatic environment and causes low aquaculture production. Once again, fish diseases are a major challenge to optimal production and are a restrictive factor in Bangladesh's economic performance. The study also found some problems with the use of such chemicals because farmers were unfamiliar with the use of chemical compounds, sufficient dosage, method of use and indiscriminate use. Most studies were done on the use of aqua drug and their impact of fish health and production. But did not study on the market share of aqua drug and companies and fish health management in Lakhsmipur district, Bangladesh. Thus, the present study was carried out to describe the status of aqua drug and their use in aquaculture.

Materials and Methods

The present study was carried out in some upazillas like as in Lakhsmipur sadar upazilla Raipur upazilla, Ramgoti upazilla under the district of Lakhsmipur in Bangladesh (Figure 1). The study was carried out six months from August 2016 to March 2017 with a view to finding out the present status of aqua drugs and chemicals used in fathomed area. Considering the intensity of fish farming of those areas, fifteen fish farmers, fifteen retailers of animal or fish medicine and nine representative of pharmaceuticals companies were selected at Lakhsmipur Sadar Upazilla, Raipur and Ramgoti Upazilla. Data were randomly collected from retailers, fish farmers, representatives covering the selected study area. Field level data were validated by the crosscheck interviews with the key informants. Data were collected through questionnaire interview. The questionnaire consisted of open and closed questionnaires. There has been a number of preliminary questions. Chemical names, purpose-of-use active ingredients, method of application and length of dosing, source, environmental impacts, health effects and productivity were the main subjects of this questionnaire.

A simple random sampling procedure accompanied the interview. Also accumulated by industry analysis and Participatory Rural Assessment (PRA) with chemical sellers or animal health suppliers, members, and fishermen, as well as by Focus Group Discussion (FGD). Two-third portion of the data were collected from retailers of aqua chemical shops present in the study areas. The primary and secondary data were used during the analysis. Various survey techniques were followed, and combination of several techniques were adopted for gathering data. Primary data were collected through personal interviews with farm owners, retailers, and representative of different pharmaceuticals companies. Drugs and chemicals trade name, chemical compound, purpose of use, dose, price, related companies of the available drugs and chemicals were considered important elements during investigating fish farms, culture pond and aqua chemical shops.

For the collection of secondary data Journals, textbooks, newspaper etc. were used. Moreover, appropriate government and non-government organizations as like Upazilla Fisheries Office were also visited. For the verification of field level information different private aqua consulting agencies or farms were also visited. The data were analyzed and summarized in tablets, which is why the collected data was carefully checked and summarized prior to the actual tabulation. This was achieved. Tables and charts related to this have also been developed and data is finally presented in tabular and graphical form. The data analysis was carried out using Microsoft Excel 2013 (Flow Chart).

Results

Commonly Available Aqua Medicines in Lakhsmipur Sadar Upazilla, Raipur Upazilla, and Ramgoti Upazilla

In Lakhsmipur Sadar Upazilla, commonly available aqua medicines were Oxyflow, Bio-Ox, Oxymax (oxygen supplier); Timsen, Virex, Sumithion (disinfectant); Aqua Boost, Charger gel (growth promoter); Renamycin, Renaquine, Renamox, Doxioxy, Bactitab (antibiotics); Ammonil, Matrix (gas reducer); Virex, Potash, Lime, Malachite green, Methylene blue (for disease treatment); Ossi C, Revit C (vitamin); Zeolite gold, Geotox, rotenone (for pond preparation and water quality management); Aqua photo, Pond plus (probiotics).

In Raipur Upazilla, commonly available aqua medicines were Oxyflow, Oxymore, Oxygold (oxygen supplier); Timsen, Sumithion, Virex, Bactisol-80, Pond safe (disinfectant); Megavit aqua, Aqua boost, ACmix super-Fish, Panvit aqua (growth promoter); Renamycin, Amoxifish, Amoxivet, Oxysestin, Bactitab, Oxy Dox F (antibiotics); Gastrap, Ammonil (gas reducer); Ablaze, Vime clean, Eco-solution. Formalin, Salt, Malachite green, Potash, Lime (for disease treatment; Ossi C, Grow fast, Silvermil (vitamin); Zeolite gold, Rotenone, Bio-pH (for pond preparation and water quality management); Aqua photo, Biozyme (probiotics).

In Ramgoti Upazilla, commonly available aqua medicines were Oxyflow, Oxygold, Bio-Ox (oxygen supplier); Timsen, Virex, Sumithion (disinfectant); Aqua Boost, Charger gel (growth promoter); Renamycin, Aquamycine, Renamox (antibiotics); Ammonil (gas reducer); Potash, Lime, Virex, Melathion (for disease treatment); Ossi C, Revit C, Growfast (vitamins); Zeolite gold, Rotenone, Megageo plus (for pond preparation and water quality management); Aqua photo, Pond plus, Biozyme (probiotics) (Table 1).

Name of Top Ten Aqua Drugs and Chemicals in Lakhsmipur district

According to the findings, farmers in the Lakhsmipur district use ten different aqua drugs in their ponds. Timsen is the first option for destroying bacteria, Virex for disinfection, Oxyflow for oxygen supply, Renamycin and Aquamycine for antibiotics, Ossi C for vitamins, Aqua Boost for growth, Aqua Photo for probiotics, Ammonil for gas reduction, and Geolite gold for pond preparation and water quality control. (Table 2).

Market Share of Aqua Chemicals in Study Area

By consulting with retailers and fish farmers, the study discovered that 51 drugs and chemicals were available in the study area. According to the use of chemicals by farmers, Timsen, Oxyflow, Virex, Renamycin, Aquamycine, Ossi C, sumithion, Geolite gold, Potash, and Aqua boost were the most commonly available. Timsen was the most common among these, accounting for 23% of the total, which is why most farmers used it as a disinfectant (Figure 2).

Market Share of Aqua Pharmaceuticals Companies

In the study area there were 22 companies being supplied different drugs and chemicals and about 79% of the products were supplied by ten companies. The study showed that these were Fish tech (BD) Ltd. (23%), Novartis Animal Health Ltd. (15%), ACI Livestock and Fisheries (7%), Renata Ltd. (5%), Eon Animal Health products Ltd. (5%), Acme Pharmaceuticals Ltd. (5%), Square Pharmaceuticals Ltd. (5%), Opsonin Pharma Ltd. (4%), Sigma agro-vat Ltd. (5%), Fish Care Pharmaceuticals Ltd. (5%) and the remaining 21% were supplied by the 12 companies including local non brand companies. (Figure 3)

Aqua Drugs and Chemicals Frequently used by the Farmers

Farmers primarily used oxygen suppliers to raise oxygen levels in water bodies, according to the report. Farmers in the study region mainly used Oxyflow, Bio-Ox, and Oxy gold. Oxyflow (Novartis Animal Health Ltd.) was used in 61% of the cases, Bio-Ox (ACI Animal Health Ltd.) in 20% of the cases, and Oxygold (Fish tech BD Ltd.) in 19% of the cases (Figure 4). Timsen, Virex, and Sumithion were found to be the most commonly used disinfectants by farmers in the study. Timsen (Eon Animal Health Products Ltd.) was used in 68% of the cases, Virex (ACI Animal Health Ltd.) in 17%, and Sumithion (Samco Ltd.) in 15% (Figure 5). The study showed that Aqua Boost, Megavit aqua, Charger gel were mostly used by the farmers in the study area. Aqua Boost (Novartis Pharmaceuticals Ltd.) was used in percentage in 55%, Megavit aqua (Novartis Pharmaceuticals Ltd.) used in 28% and Charger gel (Fish tech BD Ltd.) used in 17% (Figure 6). Mostly used chemicals as antibiotics in the study area were Renamycin, Aquamycine, Renamox. Renamycin (Renata Ltd.) and used in 46%, Aquamycine (ACI Livestock and Fisheries) in 35% and Renamox (Renata Ltd.) in 19% (Figure 7).

In the study region, farmers used gas reducers such as Ammonil, Gastrap, and Matrix. Ammonil (Novartis Animal Health Ltd.) was used 60% of the time, Gastrap (Square Pharmaceuticals Ltd.) was used 24% of the time, and Matrix (Eon Pharmaceuticals Ltd.) was used 16% of the time (Figure 8). Farmers in the study area used vitamins such as Ossi C, Revit C, and Growfast. Ossi C (Fish tech BD Ltd.) was used in 62 percent of the cases, Revit C (Opsonin Pharma Ltd.) was used in 20% of the cases, and Growfast (Rals Agro Ltd.) was used in 18% of the cases (Figure 9). Aqua photo, Biozyme, and Pond plus were the most commonly used probiotics in the study region. Aqua photo (ACI Animal Health Ltd.) was used in 54% of the cases, Biozyme (Fish tech BD Ltd.) was used in 26% of the cases, and Pond plus (Fish tech BD Ltd.) was used in 20% of the cases (Figure 10). The study discovered that Geolight gold, Rotenone, and Megageo plus were the most commonly used chemicals for pond preparation and water quality management. Geolight gold (Fish tech BD Ltd.) was used in 43 percent of the cases, Rotenone (Samco Ltd.) was used in 29 percent of the cases, and Megageo plus (ACI Livestock and Fisheries) was used in 28 percent of the cases (Figure 11).

Aqua Drugs and Chemicals used by the Farmers at Lakhsmipur Sadar Upazilla

From the study it has been found that there are 27 in number aqua drugs and chemicals at Lakhsmipur Upazilla. Among these aqua drugs Aqua Photo and Ammonil were used in 9%; Oxyflow and Aqua boost were used in 7%; Virex (disinfectant), Timsen, Charger gel, Revit C, Geolite gold were used in 5%; Pond plus, Bio-Ox, Oxymax, Sumithion, Renamycin, Renaquine, Renamox, Doxioxy, Bactitab, Matrix, Virex (for disease treatment), Potash, Lime, Melachite green, Methylene Blu e, Geotox, Rotenone was used in 2% (Figure 12).

Aqua Drugs and Chemicals used by the Farmers at Raipur Upazilla

According to the findings of the current study, farmers in Raipur Upazila used 36 different aqua medicines and chemicals. Among those drugs, Aqua Photo, Oxyflow and Ammonil were used in 7% of each; Biozyme, Aqua Boost, Ossi C, Growfast, gastrap, Geolite gold, Rotenone were used in 4% of each; Bio-pH used in 3% of each; Oxymore, Oxygold, Timsen, Sumithion, Virex, Bactisol-80, Pond safe, Megavit aqua, Acmix super-fish, Panvit aqua, Renamycin, Amoxifish, Amoxivet, Oxysestin, Melachite green, Potash, Lime and Silvermil were used in 2% of each; Oxy Doxy F, Bactitab, Ablaze, Vime clean, Eco-solution, salt and formalin were used in 1% of each (Figure 13).

Aqua Drugs and Chemicals used by the Farmers at Ramgoti Upazilla

From the study it has been showed that there are 24 in numbers of aqua drugs and chemicals found at Ramgoti Upazilla. Among these drugs Ammonil used in 11%; Aqua Boost and Charger gel are used in 6%; Renamycin, Aquamycine, Potash, Lime, Ossi C, Revit C, Geolite gold, Megageo plus, Aqua Photo, Biozyme, Oxyflow, Bio-Ox, Timsen and virex are used in 4%; Growfast, Rotenone and Pond plus are used in 3%; Renamox, Melathion, Oxygold and Sumithion are used in 2% ((Figure 14).

Diseases Occurred in the Study Area

In the area studied the following diseases were observed: Gill, Dropsy, Tail red disease, EUS, Body hemorrhage and various freshwater fish species. Often found in shrimp species is ciliated protozoan disease. Melachite green, disinfectant and vitamin combinations, antibiotics, vime clean were used for various treatments for various diseases (Table 3).

Effect of Aqua Drugs and Chemicals on Fish Health

EUS affected Tilapia were treated by farmers with antibiotics as Renamycin, Renamox and Oxysestin having 80-85% recovery. Ammonia poisoning was seen with Labeo rohita, Gibelion catla treated by regular water check and maintenance with a result of 90% recovery. Renamycin and Zeolite Gold were used as drugs by the farmers with a result of 85% recovery. Farmers reported that Indian major carp found to be susceptible with Lernaeasis having 80% recovery. Oxyflow, Oxy life, Bio-oxy were used by the farmers as the treatment on oxygen deficiency of Labeo rohita and Gibelion catla having 90% recovery. Without reasonable symptoms Heteropneustes fossilis, Clarias batrachus were the most susceptible species having 30% prevalence. Deletix and Timsen were used by the farmers as the treatment on white spot disease of Heteropneustes fossilis, Clarias batrachus resulting 80% prevalence and Heteropneustes fossilis is mostly susceptible to white spot in Nov-Feb among the affected species (Table 4).

Discussion

With the intensification of aquaculture practices in the recent years in Bangladesh, uses of chemicals were increased. In aquaculture, among others, the external inputs required for successful fish production is chemical which has been used in various forms for centuries [9]. In aquaculture activities the benefits of chemical usage are many. Aqua drugs and chemicals are used to develop water quality, dissolve oxygen level, as disinfectants, disease treatment, antibiotics and growth promoter and are widely recognized in Bangladesh. The present study was carried out to know the present status of aqua drugs and chemicals in three upazillas of Lakhsmipur district and impact of aqua-drug on fish health. In this study, it was found that mostly nine different categories of commercial aqua drugs and chemicals were used by farmer for different aquaculture purposes like disease treatment, disinfectants, growth promotion, pond preparation, antibiotics, gas removal, oxygen supplier, vitamins, and probiotics.

In the study area, 51 products of 22 animal health companies were found to market at field level. Seven categories of aqua-medicines and chemicals were used by small fish farmers, commercial fish farmers and hatchery owners in Shatkhira District [10]. Eight different categories of aqua drugs and chemicals were found to use in shrimp farming activities in coastal belt of Bangladesh as oxygen suppliers, disinfectants, growth promoters, antibiotics, pond preparatory, gas removal, insect killers and microbe killers (Ahmed et al., 2014) [1]. Six categories of aqua drugs and chemicals were found to be used by fish farmers and hatchery owners for water quality management, disinfectants, disease treatment, antibiotics, and growth promoter [11]. In the present study, it was observed that about 10 antibiotics (specially oxytetracycline, hlorotetracycline, amoxicillin, co-trimoxazole, sulphadiazine, azithromysin) with different trade names were used by the farmer. Antibiotics should be used only for the treatment of bacterial diseases.

It was found in the present study that antibiotics were used indiscriminately without knowing the exact reasons of disease. Some farmers did not follow the described dosages for treatment. It is widely recognized that the excessive use of antibiotics contributes the development of resistant strains of bacteria [12]. Most of the farmers used chemicals and antibiotics indiscriminately without knowing their mode of action, doses, and appropriate procedure of application [13]. Most of the large farm owners used aqua drugs and chemicals by knowing their dose, purpose, and application. But in small farms drugs were used indiscriminately. Rasul et al., [14] reported that 18 trade names of antibiotics were found and frequently used the trade name of antibiotics like as Oxy-Dox-F and Renamycin by the freshwater aqua farmers in Sylhet, Bangladesh.

From the present study, it was found that Megavit aqua, Aqua Boost, ACmix super-Fish, Charger gel, Panvit aqua were highly available aqua drugs used as growth promoter. Faruk et al.,[8] found that Megavit aqua, Aqua Boost, Aqua savor, Vitamin premix, Fibosoel, Growfast, Orgavit aqua, Aq-cell, Aqgrow-g, Fish vita plus, Aq grow- 1, Growmax, Nature aqua gp, Vitamix, F aqua, Acmix and many more chemicals have been used as growth promoters to increase production. Geolite gold, Geotox, Megageo plus, Rotenone, Bio-pH were readily available aqua drugs used for pond preparation and water quality management in the study area. Similar products were found by Faruk et al. and Chowdhury et al, [8,15]. Timsen, Virex, Bactisol-80, Sumithion, Pond safe were seen in the study area used as disinfectants. EDTA, Bleaching, Timsen, Emsen, Water clear, Pathocide, Omicide, Lenocide, Microdine-iodine 20%, Formalin, BKC, Efinol, were found as disinfectants by Faruk et al. [8].

Vitamins help to increase body weight, growth, and disease resistance power of fish. Ossi C, Revit C, Growfast, Silvermil were found as vitamins in the present study area. Large farm owners which contain own feed formulation technology maintain balanced diet by mixing vitamins with feed. Whereas small farm owners cannot maintain balanced diet because of using supplementary feed Alam et. al., [10] reported that three brand name of vitamin premix (Acimix Super-fish, Megavit-Aqua, Square aqumix) were found in Sathkhira, Bangladesh. From the present study, it has been found that to increase disease resistance power a little amount robiotics were found to be used. Aqua photo, Biozyme, Pond plus were readily available probiotics in the present study area. Chowdhury et al., [15] reported that other probiotics products (Biomax, Probio aqua LQ, Square aquamix) were found in Zakiganj, Sylhet.

In the study area, about 79% of different drugs and chemicals were supplied by ten companies. The study showed that these were Fish tech (BD) Ltd. (23%), Novartis Animal Health Ltd. (15%), ACI Livestock and Fisheries (7%), Renata Ltd. (5%), Eon Animal Health products Ltd. (5%), Acme Pharmaceuticals Ltd. (5%), Square Pharmaceuticals Ltd. (5%), Opsonin Pharma Ltd. (5%), Sigma agro-vat Ltd. (4%), Fish Care Pharmaceuticals Ltd. (5%) and the remaining 21% were supplied by the 12 companies including local non brand companies. Chowdhury et al., [15] reported that fifty-two pharmaceutical companies have been recorded to market around 300 products. Most of the products have been marketed from different countries like USA, Thailand, Malaysia, Belgium, and China etc.

The present study revealed that commercial aqua drugs have some positive impact on fish health management and disease treatment at farmer’s level. It was observed that farmers of the selected areas got good results in disease treatments by applying single or combinations of various aqua-drugs and chemicals. In some cases, after use of drugs they got about 85% recoveries within a short period of time. These results influenced farmer to use more commercial aqua-drugs in controlling disease. Sometimes they applied drugs higher than recommended doses to get quick recovery. Normally in rural aquaculture, farmer used traditional chemicals in health management such as lime, salt, potassium permanganate, sumithion, melathion, formalin and bleaching powder. But they did not get better results than commercial drugs and chemicals. So, the farmer showed less interest to traditional drugs for disease control. The uncontrolled uses of drugs sometimes have got negative impact on fish health. Some pathogen evolved drug resistance ability due to unconscious and repeated use of drugs. It was not possible to control the disease in such condition. It was also found that in case of diseased Heteropneustes fossilis, farmers did not get any recovery.

The present study showed that Ciliated protozoan disease, Dropsy, Body hemorrhage, EUS, Gill disease, Tail rot disease, Anchor Problem were identified. The most prevalent symptom of disease was red spot, followed by EUS, Dropsy, Edwardsiellosis, Red Spot Disease, Columnaris, Argulosis, Brachiomysis and White Spot disease. Similar conditions were also reported in the rural carp culture by several authors [16-19]. Most of the farmers of the selected areas used drugs and chemicals to control these types of disease. It meant that disease problem was one of the major concerns in aquaculture of the studied areas.

The aquaculture activities in Bangladesh are also influenced by a number of chemicals. It is important that policy makers, researchers, and scientists work together to address the issues of use of new commercial aqua-drugs and chemicals with the view to reduce their adverse impacts. Efforts should be made towards finding non-chemotherapeutic solutions to health management and disease control. Also, there is a need for better understanding of fish farm health management and disease prevention practices that could reduce the need for drug treatments.

Conclusion

Finally, the safest option is to reduce the harmful effects of chemical products in aquaculture by using less chemicals. During the field observation, some problems with the use of aqua medicinal products, including poor farmers' understanding of drug use, an insufficient time of withdrawal and some adverse effects on fish and human health, were found. In a cultural system, all medicines from an enterprise may not be appropriate for disease therapy. The study field has included fifty-one different types of aqua medicines and chemical products, of which ten are commonly used by farmers in the treatment of differing fish diseases. In order to overcome adverse pathologies in fish organs, the use of aqua-drugs and chemicals in ponds and ghers should be minimized. The overuse of aqua drugs and chemicals in fisheries has also shown a detrimental effect. Nevertheless, the appropriate authorities, policy makers, researchers and scientists should collaborate to reduce the harmful effects of aqua drugs and chemicals. This research will be useful for the market share of different drug and companies and taking precautionary steps against aqua drug use.

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