Volume 1, Number 6
CONSERVATION STATUS OF VITELLARIA PARADOXA, PARKIA BIGLOBOSA AND DANIELLIA OLIVERI IN ILORIN ENVIRON, KWARA STATE, NIGERIA
In a survey which was conducted about a decade ago on tree species used as sources of fuelwood in Ilorin environ, Vitellaria paradoxa C. F Gaerten and Parkia biglobosa (Jacq.) Benth. stood out as the most preferred species for domestic cooking and baking of bread. In the present study, the conservation status of these 2 species was determined along with that of Daniellia oliveri (Rolfe) Hutch. & Dalz., which is not a popular choice for use as firewood. The frequency of V. paradoxa dropped from 62% in 1989 to 40% in 2011. That of Parkia biglobosa dropped from 88% to 60%, while the frequency of D. oliveri rose from 62% to 70%. V. paradoxa, therefore, appears to be vulnerable or threatened while P. biglobosa is near threatened. The frequency of D. oliveri rose from 62% to 70% hence the status is of least concern. The data obtained on the tree height, trunk diameter and crown diameter agreed with these conclusions on anthropogenic impact on these species. There were relatively few tall trees, with very wide trunks and crowns in V. paradoxa and P. biglobosa, while D. oliveri had fairly many more tall trees with wide trunks and crowns.
Influence of Different Levels of Water Aeration on Growth Indices and Mortality Rates of Heteroclarias Hybrid under Laboratory Conditions in Minna Nigeria
Study was carried out to determine the influence of different water aeration levels; 0.00(control),6.00, 12.00,24.00 hours respectively on growth indices and mortality rate of Heteroclarias freshwater hybrid fish fingerlings under laboratory condition for a period of 12 weeks. Commercial diet (coppens) of 56.0% Crude Protein (CP) was fed twice daily to satiation. Growth indices and physiochemical parameters were determined weekly based on standard procedures while the mortality rates were recorded daily. Results showed that the fingerlings cultured in 6.00hours of aeration were significantly (P<0.05) higher in final body weight, weight gain and percentage weight gain except specific growth rate. The mortality rates of the fingerlings cultured in 24.00hours of aeration were significantly (P<0.05) highest ( 70.00+ 19.38%) at the end of the study. The physicochemical parameters of the fingerlings cultured in all the treatments were all within the range documented for fish growth in the tropics. The findings of this study indicated that growth indices and survival rates of Heteroclarias fish hybrid can be enhanced by using 0.00 to 12.00 hours of water aeration. Fulltext | PDF
Nutrient Utilization and Haematological Indices of Clarias gariepinusFingerlings Fed Varying Inclusion Levels of Fermented Flamboyant (Delonix regia) Seed Meal in Concrete Tanks
This study investigates the nutrient utilization and hematological indices of African cat fish Clarias gariepinus fingerlings fed fermented flamboyant (Deloxi regia) seed meal (FFSM). Fish with mean initial weight of 1.1±0.1 g were fed four isonitrogenous and isolipidic diets formulated at 40% crude protein and 9.5% lipid containing different levels of inclusion of FFSM and designated as D1 (0 % inclusion), D2 (10 % inclusion), D3 (20 % inclusion) D4 (30 % inclusion) for 56 days. Twenty (20) fish per hapa were accommodated in twelve net hapa (0.5×0.5×1m) suspended in two outdoor concrete ponds (8mx5mx1.5m) with the aid of kuralon twine tied to plastic poles. The concrete ponds were filled to 5/6 of its volume (40m3) with filtered and dechlorinated tap water. The fish were fed at 5% body weight three times daily. The results showed that fish fed D4 had the highest significant value in the total feed intake (TFI) although not significantly (P>0.05) different from D1 and D2. Fish fed D3 had a higher feed utilization, hence, feed efficiency, protein efficiency ratio and protein retention were significantly (P<0.05) higher than those fed D1, D2 and D4 fed fish. There was no significant difference in the hematological indices among all the fish fed the experimental diets. In conclusion, inclusion of FFSM up to 30% in the diet of Clarias gariepinus is suitable and have no negative effect on the nutrient utilization and hematological indices of the fish fed experimental diets. Hence FFSM can be a potential ingredient for aqua feed industry. Fulltext | PDF