Scholars Academic Journal of Biosciences Abbreviated Key Title: Sch Acad J Biosci ISSN 2347-9515 (Print) | ISSN 2321-6883 (Online) Zoology Journal homepage: https://saspublishers.com A Comprehensive Review on the Prevalence and Dissemination of Some Bacterial Diseases in Ornamental Fishes and Their Preventive Measures Arnab Chatterjee1#, Sucharita Ghosh2#, Ritwick Bhattacharya1#, Soumendranath Chatterjee2, Nimai Chandra Saha1* 1Fishery and Ecotoxicology Research Laboratory (Vice-Chancellor’s Research Group), Department of Zoology, the University of Burdwan, Burdwan 713104, West Bengal, India 2Parasitology & Microbiology Research Laboratory, Department of Zoology, the University of Burdwan, Burdwan, West Bengal, India #Authors contributed equally DOI: 10.36347/sajb.2020.v08i11.005 | Received: 06.11.2020 | Accepted: 17.11.2020 | Published: 20.11.2020 *Corresponding author: Nimai Chandra Saha Abstract Review Article As a consequential sector within the fisheries segment, ornamental fisheries have become a billion-dollar industry. At current, it is estimated that the aquarium industry is worth about 15 billion dollars. In ornamental aquaculture and aquarium keeping, the incidence of diseases is the main quandary that emerges during culture and deplorably affects the profitability of the ventures. Diseases are caused by viruses, protozoa, bacteria, fungi, and parasites under profound culture conditions, and the likelihood of stress elevates in an immensely colossal portion of the stock. Of these, the most paramount causes of sudden fish death are infectious and bacterial diseases. Nowadays, veterinary antibiotic treatment of contaminated fish is being applied in most of the States of India. Disease obviation is often less costly than treating disease outbreaks when it is subsisting. Adopting and implementing a health management strategy would not assure a disease-free facility that ultimately leads to considerably decremented chances of dissemination of diseases. In the present report, an effort has been made to review in detail the main bacterial diseases occurring in the ornamental fish along with their obviation. Keywords: Ornamental fish; ornamental fish trade; bacterial disease; disease control; health management. Copyright © 2020 The Author(s): This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY-NC 4.0) which permits unrestricted use, distribution, and reproduction in any medium for non-commercial use provided the original author and source are credited. NTRODUCTION 177.7 million USD in 2014 to 347.5 million USD [5]. It I is estimated that the world trade in ornamental fish is Aquarium maintenance is the second most over US$ 15 billion and that more than 2 billion live immensely colossal hobby on the planet, and because of ornamental fish is exported [1]. 99% of the global market its immense financial opportunities, the ornamental fish is confined to hobbyists and less than 1% is used for industry is gaining prominence [1]. Ornamental fish public aquaria and research institutes. In the world, conservation was developed in the 18th century as just a developed countries offer more than 60 percent of hobby with goldfish [2]. Aquarium maintenance and ornamental fish to global producers and suppliers [7]. ornamental fish farming became macro cosmically The 2016 global export value for ornamental fish was acknowledged in the 20th century. Virtually 90.0% of US$ 337.70 [8]. A close glance at the top ten Freshwater ornamental fish are bred in captivity waters export-market areas, which supplied 78.6% in 2014, [3]. It has been estimated that approximately 25 of 8,000 found that Asian countries made up more than 57% of ornamental aquatic organisms are not facilely grown [4]. trade for exports at US$ 197.7 million. In 2014, by Many high-value aquatic ornamental fish are country, Singapore, with its US$ 69.32 million worth of consequently extensively bred and domesticated. In exports, was the world's ornamental fish capital [8]. more than 125 countries of the World with a market value of over $10 billion, marine and freshwater India has a wide assortment of fish, huge ornamental fish are traded. Over 2500 fish species, more numbers of which are very appropriate for ornamental than 60 percent of which emanate from freshwater are purposes. The contribution of India to foreign trade in involved. The universal market is expected to be ornamental fishes is, however, minimal standing at 1.6 dominated by about 30 freshwater fish species [5]. The million US$ (2016) [9]. The export of ornamental fish marine species represent over 15% of the market, with from our country began with some tropical freshwater about 98% obtained from the wild while the remaining species in 1969. Over the years there has been a growing species are captive bred [6]. Since 2000, universal trend and exponential rise in exports of ornamental fish exports of ornamental fish have grown steadily from from India. India's global market share in 1991-2009 © 2020 Scholars Academic Journal of Biosciences | Published by SAS Publishers, India 371 Arnab Chatterjee et al., Sch Acad J Biosci, Nov, 2020; 8(11): 371-377 ranged from 0.12 to 1.16 percent. The export value in bacterial diseases, signs, prevalance and spreading of the 2016 was US$ 1.06 million for the Indian ornamental diseases along with their obviation in the ornamental fish industry, which accounted for 0.3 percent of the fishes are summarised in this article, along with their overall export value [10]. In the World Exporting treatment protocols. Countries ranking, India ranks 31st. India is a nation with high biodiversity with approximately 374 What are ornamental fishes? ornamental freshwater species and approximately 700 The ornamental fishes are one of the most indigenous ornamental fish [5]. Around 90% of the important commercial sectors of fisheries that provide ornamental fish are traded from the port of Kolkata, then millions of dollars of profits and support the livelihood 8% from Mumbai and 2% from Chennai [8]. A good of peoples of some developing countries. These fishes atmosphere, modest labor, and simple distribution make India plausible for ornamental aquaculture [11]. The are popular around the globe due to their minimum National Fisheries Council has familiarised itself with requirements, space and easy maintenance in aquaria. various sponsoring projects aimed at promoting Ornamental fishes are those kept in artificial habitat for minute-scale integrated ornamental fish farming, thereby aesthetic purposes. They are reared for their vibrant providing urban and rural youth job opportunities [12]. coloration and attractiveness [15]. However, the outbreak of disease is the bottleneck during raising and building up the broodstock and during Some commonly reared ornamental fishes reproducing and raising of ornamental fishes [13]. There are frequently high mortality rates in ornamental fishes along with their origin and characteristics are listed in due to the potential risks, especially infection incursions, Table-1. and parasite assaults [14]. Several economically consequential diseases are registered and typical Table-1: Origin and characteristics of some common ornamental fishes Common Scientific name Origin Characteristics name Angelfish Pterophillum scalare South America Variation in color and pattern, omnivorous Molly Mollienisia lapipinna, M. Mexico, Gulf Coast, Yucatan Small, omnivorous sphenops, M. vetifeara Goldfish Carassius auratus East Asia Red/orange in color with large eyes Gouramies Trichogaster lalius (dwarf Southeast Asia Moderate to large-sized, different color gourami), T. leerii (pearl), and pattern according to variety Osphronemus sp. (giant gourami), Guppy Poecilia reticulata South America Males are more colorful and vibrant than females Koi carp Cyprinus rubrofuscus Japan, China Huge variation in color, scalation and pattern. Omnivorous. Live up to 100-200 years Betta/ Betta splendens Southeast Asia Vibrant coloration. Males are extremely Fighter fish aggressive Platy Xyphophorus maculatus North and Central America Huge range of color variety Zebrafish Danio rerio India, Nepal, Bangladesh, Horizontal blue stripes on side of the body, Myanmar, Pakistan 1.8-4cm in length Ticto Barb Puntius ticto India, Nepal, Bangladesh, Sri Silver to gold in color with two black spots Lanka, Myanmar, Pakistan Swordtail Xyphophorus helleri Mexico, Northern Central Different color variations. Small-sized America with a sword-shaped extension of the caudal fin Neon tetra Paracheirodon innesi South America Bright coloration with blue stripes The occurrence of disease in ornamental fishes white spot disease, popeye disease, dropsy, slimy skin However, these delicate fishes are very much disease are common in ornamental fishes. Infection due prone to different types of diseases due to their to nematodes, lice and flukes are also common in sensitivity towards the surrounding environment [16]. ornamental fishes [17]. The common causes of fish disease fall under six broad categories like environment-related disease (such as Common symptoms of fish disease temperature, poor water quality, etc), nutritional disease, Loss of appetite and color, sluggishness, genetic disease, physical injuries, disease through irregular swimming behavior, etc. are some most biological organisms and/or combination of these common symptoms of diseased fish. Overall, skin factors. Diseases like tail and fin rot, columnaris disease, lesions, systemic infections,