Browsing by Subject "Fecundity"
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Item Breeding and ................(Amrit Campus, 2023-08-17) Khanal, DeewaThe study was carried out in the induced breeding and rearing performance of Indian Major Carps (Labeo rohita and Cirrhinus mrigala) at Fisheries Development Center, Bhandara, Chitwan from June to September 2022. The embryonic development from egg to fingerlings as well as fecundity rate, GSI, fertility rate, hatching rate, survival rate, and growth of both species were studied. The Ovaprim hormone at a ratio of 0.25 ml/kg for male and 0.5 ml/kg for female of Rohu and Naini were administrated. The fecundity of Rohu and Naini was observed between 227,540 to 675,000 and 161,400 to 608,400 while GSI was between 10.33% to 19.74% in Rohu and 10.71% to 28.15% in Naini respectively. The latency period observed was 7-8 hrs whereas the hatching occurred after 17-18 hrs. A total of 6 hapas (3 for Rohu and 3 for Naini) of 1×1×1m3 were used to study the growth of fish and 100 hatchlings were kept in each hapa. The fertility, hatching, and survival rate were 82.28-87.27%, 73.91-83.33%, and 62-73% in Rohu and 79.63-87.88%, 77.90-83.90%, and 59-75% in Naini respectively. The correlation between the length and weight of fish was found near 1 which represents a similar relation and the value of regression coefficient ‘b’ ranged from 2.1 to 2.5 showing negative allometry. The condition factor (K) and relative condition factor (Kn) were found >1 in both fish which shows proper growth of the fishes.Item Breeding Performance and Rearing of Bhakur ( Catla Catla, Hamilton, 1822) Using Ovaprim in Rupendehi, Nepal(Department of Zoology, 2022) Gurung, SoniyaThe study of breeding performance and rearing of Catla catla was done in Pure Line Fish Breed Conservation and Promotion Resource Centre, Rupendehi, Nepal from July to November 2020. Fishes were spawned successfully following a single dose of ovaprim with 0.5ml/kg for female and 0.25ml/kg for male. The spawning behaviour was observed after 8 hours of hormone treatment at temperature ranges from 29-31°C. The hatching occurred after 13 hours of fertilization. The experiment was conducted in three replicas of 1×1×1m 3 hapa. The fecundity was 142,400 to 324,800 while Gonado somatic index was 5.12-8.88%. The fertilization, hatching and survival rate were 77.78%, 65.25% and 44.1% respectively. The pH ranges from 7.6 to 9.8, dissolved oxygen 5.0mg/lt to 8.6 mg/lt and temperature 25.8-37.1°C. The water quality parameters were suitable for breeding and rearing of Catla catla and the ideal weight of female was found 4.5 kg.Item Breeding performance and rearing of Bhakur ..................(Amrit Campus, 2023-08-17) Gurung, SoniyaThe study of breeding performance and rearing of Catla catla was done in Pure Line Fish Breed Conservation and Promotion Resource Centre, Rupendehi, Nepal from July to November 2020. Fishes were spawned successfully following a single dose of ovaprim with 0.5ml/kg for female and 0.25ml/kg for male. The spawning behaviour was observed after 8 hours of hormone treatment at temperature ranges from 29-31°C. The hatching occurred after 13 hours of fertilization. The experiment was conducted in three replicas of 1×1×1m3 hapa. The fecundity was 142,400 to 324,800 while Gonado somatic index was 5.12-8.88%. The fertilization, hatching and survival rate were 77.78%, 65.25% and 44.1% respectively. The pH ranges from 7.6 to 9.8, dissolved oxygen 5.0mg/lt to 8.6 mg/lt and temperature 25.8-37.1°C. The water quality parameters were suitable for breeding and rearing of Catla catla and the ideal weight of female was found 4.5 kg.Item Fecundity and Gonadal Development of Copper Mahseer, Neolissochilus Hexagonolepis (McClelland, 1839) from Tamor river, Nepal(Institute of Science and Technology, 2019) Subba, SurenThe present work was intended to assess the fecundity and gonadal development of Neolissochilus hexagonolepis from Tamor River, Nepal. The study was conducted for the duration of two years, from December 2014 to November 2016. Monthly samples of N. hexagonolepis were procured from the river. Altogether one hundred ninety eight samples were examined. The length-weight relationship (LWR) was found to be following the model of Le Cren (1951). The value of the regression coefficient (b) for all the LWR was close to 3, which indicated that the fish showed an isometric growth pattern. The general well being of the fish from the river was found to be satisfactory. The assessment of fecundity unveiled N. hexagonolepis as a low fecund fish. The number of eggs in the ovaries of N. hexagonolepis increased proportionately with increasing length, body weight and gonad weight of the fish. The enumeration of gonado-somatic index (GSI) showed the species as an annual breeder with peak spawning activity from July to August. The egg size estimation revealed the species as a multiple spawner. Male individuals dominated the smaller size classes and female individuals dominated the larger size classes. The testes and ovaries were observed at six stages of maturation viz. Immature, maturing virgin, ripening, mature, spawning and spent. The developing oocytes within the ovigerous lamellae of the ovaries were observed at the chromatin-nucleolus stage, early and late peri-nucleolus stages, early and late yolk vesicle stages and early and late yolk stages. The species showed an extended breeding period from May to November. Male and female individuals attained the first sexual maturity at size 25.5 cm and 32.9 cm, respectively. Environmental variables played an essential role in governing the reproductive biology of the fish. Temperature contributed positively to the development of the fish’s gonads during its breeding season.