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Manual on seed production of carps

Institutional Strengthening in the Fisheries Sector, Bangladesh








Peteri, A.; Nandi, S.B.; Chowdhury, S.N. Apr 1992. Manual on seed production of carps. (np). 61 p.


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    Manual / guide
    Manual on seed production of African catfish (Clarias gariepinus)
    Institutional Strengthening in the Fisheries Sector, Bangladesh
    1992
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    Due to the difficulties of Tilapia culture in Africa, particularly, those resulting from overproduction and consequent stunting in growth, attention was focused on another African fish group, which included the large size African catfish, Clarias gariepinus (Burchell, 1882). For pond culture of this species initial attempts were made at the end of sixties and beginning of seventies. The main delimitation of pond culture of it was the inadequate supply of seed at that time (Hogendoorn, 1979). I n the past two decades, methods of fish seed production, intensive and pond rearing of Clarias gariepinus were developed. These studies were made mainly in Central African Republic, the Netherlands and Israel (Viveen et al., 1986). Moreover, necessary taxonomical and biological examination of the African catfish group were carried out in the same period, which revealed that Clarias lazera and Clarias gariepinus so long considered as two separate species, were same and hence they came under the s ame scientific name Clarias gariepinus (Burchell, 1822) (Janssen, 1987). Outside its natural habitat the species is cultured in cooling water of power stations in the Netherlands and also in hot springs in Hungary. The species was also introduced in Thailand, and China. At the end of 1989 the African catfish was introduced in Bangladesh from Thailand by the Ministry of Fisheries and Livestock, Government of Bangladesh. The African catfish (it is known as African magur in Bangladesh) is simil ar to a few Asian catfish species as Clarias batrachus and Clarias macrocephalus. The main distinguishing feature of the species is the shape of occipital process of skull (Figure 1).
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    Project
    Programme / project report
    Development of large size carp fingerling production technology
    Institutional Strengthening in the Fisheries Sector, Bangladesh
    1992
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    To meet the present demand of large size (about 10 cm) carp fingerling for massive open water stocking in Bangladesh, a modified technology of large size carp fingerling production was demonstrated at four government farms, utilizing locally available facilities and feed ingredients. In the modified system production was 10602292 kg/ha in 3050 days. This rate of production in one cycle is about 4 times higher than the production under the traditional system of large size fingerling rearing. With increased management skills, raising of 45 crops of large size fingerling was found technically feasible. This means that the improved system has the potential for producing 53005500 kg of large fingerling/ha/season. By further improvement of feeding system production can be increased up to 900010500 kg/ha/season by year round multicycle multispecies culture. Against the traditional stocking rates of 40140 prenursed fry/m2, the modified system used only 819 fry/m2, but produced a much hig her biomass of larger fingerling of substantially higher sale value. Production cost of 1 kg fingerling was Tk. 42. Profit over investment was Tk. 25 (60%) in modified system, which is significantly higher than the traditional (Tk. 19/kg i.e. 18%) technology. But the production cost of fingerlings in modified system will be Tk.27/kg when the farmers will use their own stocking material instead of buying. In that case the profit will be 148%.
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    Book (series)
    Technical study
    The artificial propagation of warm-water finfishes: a manual for extension 1980
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    This Manual deals with the artificial propagation of warmwater finfishes. Being primarily meant for the extension workers and aquaculture training institutions, it is profusely illustrated. It outlines the basic biological aspects of reproduction in fish and presents the various techniques being used for the collection of fertilized eggs, the artificial fertilization of eggs and the subsequent rearing of larvae and fry. Hatchery and nursery facilities, including equipment and tools, required to set-up a medium-size fish seed production and distribution centre are also included. The various methods of transporting fish eggs, larvae, fry and fingerlings are discussed. The methods of collection and preservation of fish pituitary glands and the dosage of pituitary extracts used for inducing successful spawning in various warmwater fishes are dealt with. Finally, artificial propagation techniques for some commercially important warmwater fishes are presented.

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