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Title: Growth performance and nutrient utilization of African catfish (Clarias gariepinus) fingerlings fed diets with graded inclusion levels of duckweed (Lemma sp)
Authors: Olukunle, O.
Agboola, G. O.
Keywords: Growth performance
Nutrient utilization
Duckweed meal
Issue Date: 2005
Abstract: A twelve-week nutritional study was carried out to investigate the growth performance and nutrient utilization of African catfish (Clarias gariepinus) fingerlings fed diets with fish graded levels of duckweed (Lemma sp) meal inclusion. The diets I-V contained 0%, 25%, 50%, 75% and 100% respectively of duckweed. The experiment was carried out in circular plastic tanks of 28 litres volume under normal room condition. Each treatment contained 10 fingerlings of 3.84+0.13a average weight in three replicates. Feeding was done at 5% body weight per day and weight changes of fish were recorded every two weeks. Weight of feed were adjusted accordingly. Growth parameters such as weight gain, specific growth rate and nutrient utilization parameters such as Food Conversion Ratio (FCR). Protein Efficiency Ratio (PER), Gross Conversion of Food Efficiency (GCFC) were monitored Mean weight gain of (1.58g), survival rate (90%) and SGR 2.40% were highest in fish fed diet 1 with 0% duckweed inclusion while lowest mean weight gain survival rate and SGR (0.00%) were recorded in fish fed diet V (100% duckweed inclusion).The lowest mean weight gain and survival rate were recorded in fish fed diet V (100% duckweed inclusion). There was no significant deviation from the mean between the SGR of fish fed diets II, III, and IV (P>0.05). The Food Conversion Ratio (FCR) was lowest in fish fed diet I (2.91) and highest in fish fed diet III (5.51); no gain in weight was observed in treatment 5 hence no FCR was recorded in treatment V. Gross Conversion of Food Efficiency (GCFE) was highest in treatment 1 (34.45) closely followed by treatment IV (21.45) and the lowest treatment III (18.15), no GCFE was recorded in treatment V Protein Efficiency Ratio(PER) was highest in treatment I(0.38) and non existing in treatment V. The water quality parameters monitored during the period of the experiment (temperature, dissolved oxygen and pH) fell within the optimum range for growth and survival of C. gariepinus. The comparison of the proximate carcass composition of experimental fish before and after experiment showed an increase in crude protein level from the initial 59.87% to the highest recorded in fish fed diet IV (66.30%). In all the parameters measured (mean weight gain, specific growth rate, fish fed diet I % DWM showed the best growth performance followed by fish fed diets II, IV and III in that order. It is striken that there is no significant difference in the MWG and SGR of Diets II, III and IV containing DWM Fish fed diet V (100% duckweed inclusion) however recorded the poorest performance. Therefore, it can be inferred that for optimum growth performance and optimum catfish protein content 75% level of duckweed meal in the diet of C. gariepinus can be tolerated. The catfish fingerlings were able to digest up to 75% inclusion level of DWM with much gain in carcass protein improved FCR, GCFE and PER.
Appears in Collections:Academic Publications in Wildlife and Fisheries Management

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