University of Khartoum

Growth and Quality of the Catfish Clariasgariepinus Cultured in Backyard Farm

Growth and Quality of the Catfish Clariasgariepinus Cultured in Backyard Farm

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Title: Growth and Quality of the Catfish Clariasgariepinus Cultured in Backyard Farm
Author: Talib, Elsadig Arbab Hagar
Abstract: This study was carried out to determine the growth performance and quality of catfish Clarias gariepinus culture in backyard farms with varying level of fish meal replacement with poultry by-product meal as: T1 (0.0) %, T2 (25%), T3 (50%), T4 (75%) and T5 (100%) respectively, in locally developed recirculating aquaculture system (RAS). RAS system was developed and effluent water recycle through filter system was allowed in higher stocking density, limited area and minimal water requirement. In this study two experimental series of wild seeds and hatchery seeds were evaluated. A local hatchery, larval nursing and fry rearing were developed. The induction of brood stocks were done using OH, HCG and PGCH as stimulatory hormones. Early stage larvae is reared using Artemia, zooplankton and custard cake, and fry rearing stage fed commercial feed under different stocking density (250, 200, 150, 100 and 50 individuals /L). Data were statistically analyzed and results were compared with ANOVA and considered significant at p<0.05. Duncan's test was used to identify statistically significant differences among treatment means. The results showed that: bio-filter in RAS maintained the same water quality and achieved well efficient water treatment with no significant differences (P>0.05) between parameters before and after treatment (Temp 29.87, DO 4.3, pH 7.2, Ammonia 0.08, Nitrate 0.08, Nitrite 0.06 and TSS 56.8). The induction of hormones showed no significant differences (p>0.05) between OH, HCG and PGCH in weight of eggs, number of eggs, fertilization %, hatchability % and survival rate %. Larvae fed Artemia attained high growth (p<0.05). Fry rearing showed highly significant difference (p<0.01) between different stocking density. The growth parameters of fingerlings fed diet T1 and T5 attained highest final weight and resulted showing that poultry by-product positively promoted the growth. The analysis of gross chemical composition of C. gariepinus showed no significant difference (p>0.05) between treatment, the moisture was in range of (77.27 – 78.44%), crude protein (19.21 – 20.31%), fat (4.91 – 5.78%) and ash (2.13 – 3.37%). The rate of fats to protein content was 0.24:1 – 0.29:1 and the calorific values was 119.39-125.50, and 32 fatty acids were determined used chromatography analysis which indicted that C. gariepinus was found to be easily digested and a suitable diet for human. The economic evaluation showed that C. gariepinus in RAS was profitable (BCR>1), and based on the estimation, the economic viability of backyard practices depended on production unit volume and size and the cultured species. On the other hand the economic evaluation showed that the estimated revenue is more than one and half times (150%) compared with other technical method such as earthen pond.
URI: http://khartoumspace.uofk.edu/123456789/25637


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