Ornamental fisheries in Northeast India: State of the art and future directions

Not AvailableOrnamental fish keeping is a growing sector in aquaculture and still the 2nd most popular hobby comprising of 100 million of hobbyist in the world. More than 2500 fish species are involved in the global ornamental fish industry, where over 60% are of freshwater origin and 40% of marine origin. Out of the 422 fish species that have been reported for the Northeast region, 250 have the potential to be ornamental, with Assam having the largest number of ornamental fish species (187 species) recorded. Several species of fish can be considered as potential ornamental fish, at least during their early juvenile phase or during their breeding season. Wetlands/lakes of Assam and other Northeast states contribute a major portion in Ornamental fish diversity of Northeast India.Not Availabl

Occurrence of functional single-lobed ovary in Cirrhinus mrigala (Hamilton,1822) brood fish from Assam, India

Occurrence of abnormally developed gonads in fish is rather more uncommon in freshwater fish than marine fish. It is therefore worthwhile to disseminate the information of occurrence of a single-lobed ovary in Cirrhinus mrigala brood fish as an abnormal phenomenon. During April 2011 to March 2013, around 500 brood fish samples of Indian major carps (Labeo rohita, Catla and C. mrigala) were collected from different government and private fish farms of Assam and Tripura located in the Northeast of India. Among them, one C. mrigala specimen measuring 41 cm in total length and 640 g in weight collected from Ulubari fish seed farm of Guwahati, Assam during June, 2012 was found to have a single-lobed ovary instead of the normal bilobed structure. The ovary occupied the entire body cavity and the majority of ova were round and translucent. The ovary contributed substantially to the total body weight with gonado-somatic index of 32.81 which was the highest among all the mrigal specimens examined. The study indicates possibility of artificially inducing development of single-lobed ovary in C. mrigala for achieving possible higher spawn outputs in induced breeding of the cultivable species

Indigenous finfish species for aquaculture diversification : current status and prospects in North Eastern region

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Handbook on pig and fish husbandry practices

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: strengths and opportunities in conservation of aquatic biodiversity

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Handbook of Fisheries and Aquaculture

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Not AvailableDevelopment of appropriate feeds is one of the many challenges today’s aquaculture sector is facing in addition to issues such as diseases/ epizootics, broodstock domestication/ improvement, hatchery and grow-out technology, feed delivery mechanisms as well as water-quality management. A better understanding of the science of fish nutrition is essential to economically produce a healthy and high quality product for human consumption. It is very critical especially for fish farming because feed cost represents at least 40-50% of the production cost. Fish nutritionists around the world are generating knowledge-base on the requirements of specific nutrients for a particular species, on ingredients’ suitability and level for a species, and on variety of other aspects, which ultimately is promoting development of new and balanced aquafeeds for sustainable aquaculture. Development of species-specific feed formulations is becoming a reality in many European and American countries. Feed formulation is followed by feed manufacture (or structuring of feed). Grinding, mixing, pre-cooking/ steaming, pelletizing/ extruding, drying, packaging and storage are some of the major steps while manufacturing feed. Developments are taking place in the machineries that are required for manufacturing aquafeeds. This chapter will briefly describe the basic principles of fish nutrition and feed formulation before dealing with feed manufacture and feed delivery. Some of the recent developments in fish feed technology include determination of nutrient requirements of newer aquaculture species, inclusion of newer ingredients in the feed formulation, supplementation of exogenous enzymes, prebiotics, probiotics, immunostimulants, mild acids etc. in feed formulation, feed extrusion to get desired size/ shape/ floating characteristics of feed, precision feeding with advanced delivery mechanisms etc.Not Availabl