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Fish And Fisheries Of India By V G Jhingran Pdf 151 BETTER


the influence of the food type, different ratios of the two food types (cyclopoid and cladoceran) on the growth and survival of catla catla fingerlings in the early larval stage was investigated. sixteen individually tagged juvenile catfish were assigned to four equal groups and fed on four types of live feeds, viz., cyclopoid (cyprinidae, copepoda) alone, cladoceran alone, and mixture of cyclopoid and cladoceran at two different ratios (50:50 and 25:75) for 28 days. the effect of feeding on the growth and survival of fish was evaluated.




fish and fisheries of india by v g jhingran pdf 151



the present study was aimed to investigate the possibility of using cyclopoid (cylindrotheca ramosa) as live feed for the juvenile catfish catla catla in the early larval stage. the present study also aimed to evaluate the comparative effect of different live feed organisms on larval growth and survival of juvenile catfish.


calcium ions are important osmotic factors in regulating growth, development, and reproduction of fish [ 52 ]. they are essential for the normal functioning of the fish central nervous system and are involved in the storage and mobilization of energy [ 53 ]. calcium ions are also essential for the formation of egg shell and may play a role in the regulation of egg production [ 53 ]. as shown in table 4, in the present study, calcium ion concentration increased with increase in duration of culture of fry of catla with cyclopoid and cyclopoid + cladoceran live feeds. previous study on adult fish of barbonymus schwanenfeldii also showed similar increase in calcium ion concentration with increase in duration of culture [ 54 ]. in the present study, the water samples of the fry rearing tank with cladoceran diet showed an increase in calcium ion content during the course of experimentation which attains the maximum level at the end of experiment, while the water samples of the fry rearing tank with cyclopoid diet showed gradual increase of calcium content and attained maximum level on the 40th day of experiment with control diet and the combination of cyclopoid and cladoceran diet showed the maximum (41.00mg/l) of calcium content. in the culture system of the fry of catla with cladoceran diet, calcium ion content increased during the course of experimentation. previous studies with catla fry showed an increase in calcium ion concentration during the course of experimentation which attained maximum level at the end of experiment [ 55 ]. similar findings were observed with other fishes [ 49 ].


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