SOME ASPECTS OF UTILIZATION OF SOYABEAN MEAL BY THE YOUNG MUDFISH CLARIAS ANGUILLARIS LINNAEUS
SOME ASPECTS OF UTILIZATION OF SOYABEAN MEAL BY THE YOUNG MUDFISH CLARIAS ANGUILLARIS LINNAEUS
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Date
1990-10
Authors
EYO, ANDREW AKIBA
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Abstract
ABSTRACT
Series of experiments were carried out using
standard methods on some aspects of utilization of soyabean meal by the young mudfish, Clarias anguillaris.
The results of the first experiment which was carried out to compare the chemical composition and nutritive value of soyabean meal with those of other plant protein sources shows that soyabean meal was the
richest in protein, fat and indispensable amino acids although the level of methionine was found to be low. Two experiments were conducted to study the effect of dietary supplements of methionine on the growth and food utilization of C. anguillaris
fingerlingS. It was found that C. anguillaris
fingerlings could utilize crystalline L- and
D,L-methionine in soyabean diets effectively for growth. In the next experiment, soyabean meal were processed and incorporated in the diet of C. anguillaris fingerlings. The fingerlings were ted diets containing raw soyabean meal, soyabean residue (after milk extraction), traditionally roasted soyabean meal and soyabean meal roasted at 100°C for 15 minutes, 30 minutes, 1 hour and 2 hours.
It was found that soyabean meal roasted at 100°C for 3 0 minutes was superior at promoting the growth of
mudfish fingerlings compared with the other
soyabean treatments. An experiment was also conducted to test the effect of different dietary lysine levels on growth of fingerlings C.anguillaris fed D,L-methionine
enriched soyabean diets. It was found that the mean weight gain, specific growth rate (SGR), feed conversion efficiency (FCE) , protein efficiency ratio (PER), and apparent net protein utilization (NPU), increased linearly with increase in the level of added L-lysine in the diet. The experiment to determine the level of replacement of soyabean meal with fish meal in diets of C. anguillaris juveniles showed that 100% level of fish meal gave the the highest weight gain
although the highest PER, FCE and NPU was obtained at 90% fish meal inclusion. The best PER was obtained at 50% level. In another experiment three hundred and twenty C. anguillaris fingerlings were distributed into
16 hapas and fed different levels of cow blood meal to substitute soyabean meal in the diet at 0, 10, 25, 50, 75, 90 and 100% levels. The results showed that the experimented diet compounded with 50% blood meal and 50% soyabean meal was highest in growth values while the poorest growth was recorded in the fingerlings fed diets
containing 100% blood meal. In the final experiment four hundred and eighty
mudfish fingerlings were fed experimental diets containing isonitrogenous mixture of fish meal, soyabean meal, blood meal and groundnut cake. The best growth rate was obtained in fingerlings fed fish meal diets while those fed a mixture of soyabean
meal and fish meal diets gave growth performance which was not significantly different from that of the control ration containing fish meal,, The diet mixture containing blood meal and fish meal was
better utilized by the fingerlings than mixture of blood meal and soyabean meal.
Based on the result of experiments reported
above it could be concluded that well processed soyabean meal can be adequately utilized to promote growth in the young mudfish C. anguillaris.
Description
A thesis submitted to the Postgraduate School, Ahmadu Bello University, in partial fulfilment of the requirements of the degree of Doctor of Philosophy in Fisheries,
Keywords
SOME ASPECTS,, UTILIZATION,, SOYABEAN MEAL,, YOUNG MUDFISH,, CLARIAS,, ANGUILLARIS,, LINNAEUS