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Articles by Gift Samuel David
Total Records ( 4 ) for Gift Samuel David
  Saviour Isonguyo Umanah , Emmanuel Monday George and Gift Samuel David
  Background and Objective: Sustainability of the consistent expansion of aquacultural industry depends on development of fish culture techniques in order to obtain the most efficient, safe and cost effective methods for producing aqua products. The study evaluated the growth performance and feed utilization of African catfish Heterobranchus bidorsalis fed varying levels of flamboyant (Delonix regia) seed meal as replacement for wheat offal for 14 weeks. Materials and Methods: The experiment was conducted for 14 weeks (98 days) from May 6th to August 12th, 2017. Four experimental feeds (Diets 1, 2, 3 and 4) each with about 40% crude protein content were formulated at diet 1 = 0%, diet 2 = 15%, diet 3 = 20% and diet 4 = 25% inclusion levels of fermented and boiled Delonix regia seed meal (FSM). Post 2 weeks of acclimation, 15 fish were stocked in a happa pen sized 0.432 m2 for each feed with 3 replicates. The initial mean weight of fish was (33.70±0.78 g). Fish were fed at 3% body weight daily and adjusted accordingly every fortnight. Water quality parameters were noted morning and evening weekly. Results: Survival rate ranged from 79.99-86.66% randomly without significant difference. Treatments which contained 15% FSM gave the highest nominal performance with respect to mean weight gain, percentage mean weight gain, mean growth rate, specific growth rate and performance index, though there was no clear superiority over other feeds (p>0.05). The feed utilization indices were generally fair across all treatments, with best nominal performance in the treatment containing 25% FSM. Conclusion: The results revealed that the fish were able to utilize all the feed types well for growth, particularly at 15% inclusion level of flamboyant seed meal as basal feed stuff.
  Ofonmbuk Ime Obot , Gift Samuel David and Imaobong Emmanuel Ekpo
  Background and Objective: The study of zooplankton composition, abundance and seasonal variations is helpful in planning and successful fishery management, therefore this study attempts to shed light on the current state of the zooplankton community of this creek given its present poor state of knowledge. Materials and Methods: The zooplankton assemblage structure and distribution in Stubbs Creek, Akwa-Ibom state, Nigeria was studied (September, 2011-August, 2013). Three sampling stations were chosen. Samples were obtained by filtering 100 L of water through standard plankton net with a base collector of 500 mL. The samples were preserved in 5% formalin. Identification and counting of zooplankton was done using Zeis inverted microscope and identification keys. Results: A total of 9 species belonging to 6 taxonomic groups were recorded. The class Maxillopoda was the most abundant in number and species. Maxillopoda made up 50% of the total zooplankton identified, followed by Appendicularia with 22%. Other classes consisted of <10% each of the total zooplankton. Only Maxillopoda had 4 species, the other classes had 1 species each. The low zooplankton diversity observed in this study is common in tropical waters. Calanoida copepod was the most dominant (27.27%) zooplankton taxa, followed by Oikopleura (22.73%). The dominance of copepods in this creek makes it a good breeding ground for most fish fauna. Although there were differences in the abundance of the zooplankton taxa with seasons, they were not statistically different (p>0.05). The highest number of zooplankton taxa (6) was observed in station 1 while the highest number of zooplankton individuals (180) was observed in station 2. Stations 3 recorded the lowest zooplankton taxa of 4. The dominance of copepods may have accounted for the low Margalef species diversity (<1.012) and low Shannon-wiener index (<1.748) recorded during the study. Conclusion: It is agreed by pollution biologist that species diversity declines as pollution effects are more severe. Stubbs creek is environmentally stressed and this requires urgent monitoring of the activities on this creek to maintain a sustainable, productive and healthy ecosystem.
  Ofonime Edet Afia , Gift Samuel David and Imefon Udo Udo
  Background and Objective: Feeding level depends on the weight of the fish as well as being influenced by variables such as temperature of the water, dissolved oxygen, time of day, season and other physico-chemical parameters. The growth response, survival and feed utilization of hybrid catfish (Heteroclarias) under different feeding levels were evaluated for 12 months. Methodology: The experiment was carried out at the Department of Fisheries and Aquatic Environmental Management, University of Uyo, Nigeria using 9 tarpaulin tanks of 1 M3 volume. The study employed completely block design with three feeding levels (FL), 1.0% Fresh Body Weight (FBW) of fish (FL1), 1.5% FBW (FL2) and 2.0% FBW (FL3) as treatments. These were replicated three times at a stocking density of 75 fish m2. The feeding rate was adjusted monthly with increase in body weight. Sampling of fish was done monthly by draining whole water from all tarpaulin tanks. Results: Result shows that, there was no significant difference (p>0.05) for mean final weight, mean weight gain, specific growth rate and daily weight gain for FL1, FL2 and FL3, respectively. Feed conversion ratio at FL1 was significantly different (p<0.05) from FL2 and FL3. However, protein efficiency ratio showed no significant (p>0.05) difference among the feeding levels. Survival rate showed significant difference (p<0.05) among the feeding levels and the values increased with increasing feeding levels. Conclusion: On the basis of growth response and nutrient utilization data obtained, feeding hybrid catfish (Heteroclarias) at 1.5% body weight per day is recommended for raising hybrid catfish at reduced cost of production.
  Ofonime Edet Afia and Gift Samuel David
  Background and Objective: Fish haematology is gaining increasing importance in fish culture because of its importance in monitoring the health status of fish. The present study compared different stocking densities and its effect on the blood parameters of hybrid catfish (Heteroclarias) when they are fed at 1 and 2% body weight, respectively. Materials and Methods: The experiment lasted 12 months using 30 tarpaulin tanks of 1 m3 volume. The study was designed to have five different stocking densities, T1 = 100 fish/m2, T2 = 75 fish/m2, T3 = 38 fish/m2, T4 = 18 fish/m2 and T5 = 9 fish/m2 and two feeding levels, 1 and 2% body weight as treatments. These were replicated 3 times. The fish was fed three times daily using commercial feed at 1.0 and 2.0% body weight, respectively. The feed was adjusted monthly with increase in body weight. Blood profile was determined using 5-part differential Haematology Auto-analyzer (Mindray BC 5300 model). Results: At 1.0%, white blood cells count, haemoglobin concentration, mean corpuscular volume, mean corpuscular haemoglobin and mean corpuscular haemoglobin concentration were insignificant (p>0.05) for T1-T5. Red blood cells count and packed cell volume however showed significant variation (p<0.05) across treatments. At 2.0%, there was significance (p>0.05) in only mean corpuscular haemoglobin, all other blood parameters showed no significance (p>0.05) across treatments. Conclusion: Heteroclarias easily adapts to high stocking densities without any serious effect on the health status if adequate measures are put in place during management.
 
 
 
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