Ojo Akinrotimi

Nigerian Institute for Oceanography and Marine Research | NIOMR · Department of Aquaculture

This study assessed the effects of smoking on proximate composition of some marine fishes: Ethmalosa fimbriata, Pseudotolithus enlongatus, Mugil cephalus and Lutjanus goreensis. The fishes were purchased from Creek Road Market in Port Harcourt. Four kilograms each of the fish species were used for the analysis in both the fresh and smoked processin...

The efficacy of different maturity stages of Indian almond tree leaves (Terminalia catappa) as anaesthetics in African catfish (Clarias gariepinus) fingerlings was carried out. A total of 180 fingerlings of C.gariepinus were procured from African Regional Aquaculture Centre, (ARAC), Aluu, Port Harcourt. They were exposed to different maturity stage...

The effect of three extraction methods which include soxhlet, gas and charcoal powered smoking kiln on extraction of oil from Trachurus trachurus were investigated. Chemical analyses of the oil was carried out to determine its quantity and quality in terms of fatty acid composition by using standard laboratory methods. The results obtained indicate...

The length-weight relationship (LWR) of selected fish species of Ivo River was determined. The fish species studied were Parachanna obscura, Alestes nurse, Tilapia zilli, Arius gigas, Hepsetos odoe, Clarias gariepinus, Heterobranchus longifilis and Malapterurus electricus. A total of 132 samples belonging to seven families were captured from the ri...

Oil-bearing communities in the Niger Delta region of Nigeria are faced with the adverse effects of pollution that emanates from oil and gas exploration and exploitation activities in the region. Although sabotage has been blamed for almost every spill, unconfirmed reports indicate that there is gross negligence on the part of oil companies operatin...

The haematological changes in Tilapia guineensis exposed to sub-lethal concentrations of detergent were investigated. One hundred and eighty adult T. guineensis (mean length 17cm+2.61 SD and mean weight 145.22g+3.14 SD), were exposed using static renewal assay to different concentrations (0.00, 0.50, 1.00, 1.50, 2.00 and 2.50 mg/L) of detergent for...

The effectiveness of clove seed extracts as a viable anaesthetic agent in transportation of Tilapia guineen-sis were evaluated. Juveniles of T. guineensis (mean length 13.12cm ±1.20; mean weight 45.64g ±1.84) were exposed in three replicates to different concentrations (0.00mg/L-control; 5.00; 10.00; 15.00; 20.00 and 25.00mg/L) of clove seed aqueou...

p> Background and Aim : The intensive nature of aquaculture has subjected fish to a number of stressors in the culture medium, anesthetics are widely used to minimize the issue of stress during farming operations and activities. Clove oil is a well known, established and acceptable anesthetics commonly used in aquaculture, this anesthetics is not r...

p> Background and Aim: Fish plays a crucial role in human nutrition and food supply across the globe, particularly among the poor segment of the society. Food fish currently represents the major source of animal protein needed for growth and development, especially among the children and women who are more vulnerable to malnutrition in developing c...

p> Background and Aim: Niger delta environment has been exposed to organic and inorganic contaminants from industries and domestic wastes, thereby enhancing the capacity of the ecosystem into harboring a sizeable population of microorganisms. Most of these microorganisms are found in the water column, bottom sediment and water film, resulting in th...

Levels of some heavy metals: Iron (Fe); Copper (Cu); Cadmium (Cd); Nickel (Ni) and Lead (Pb) in some edible marine species namely: Periwinkle (Tympanotonus fuscatus); Oyster (Crasssostrea gasar); Mudskipper (Periophthalmus papilio) and grey mullet (Liza falcipinnis) were assessed during wet and dry seasons from Ekerekana and Buguma Creeks, Niger De...

The efficacy of metomidate as an anaesthetic agent and its effects on egg hatchability of African catfish (Clarias gariepinus) female brood fish were assessed using various concentrations (0.00 – control; 0.25, 0.50, 0.75, 1.00, 2.00, 4.00, 6.00, 8.00, 10.00 and 12.00mlL-1) of the anaesthetics in triplicates. A total of 110 (10 fish per each concen...

The issue of climate change has generated a lot of concern among the general public in Niger Delta region in recent time. It has been described in different ways by many people based on their views, perception and understanding. However, little considerations have been given to the impact of climate change on brackish water aquaculture in the coast...

Fisheries activities in 10 communities of Rivers State were investigated to determine the role of women in its development and sustainability. Two hundred structured questionnaires were randomly distributed in three communities (20 per community) across three Local Government Area of the State. The results from the study indicated that young and ma...

Comparative assessment and seasonal variations of some physical and chemical parameters of waters in Ekerekana and Buguma creek were investigated from July 2012 to February 2013 for a period of eight months. Water samples were collected bimonthly and analysed using standard methods. The results obtained indicated that significant differences (P<0.0...

A total of 180 Tilapia guineensis (mean length 20.62cm±2.1SD and mean weight 150.28g±3.14SD) were exposed (10 fish per tank) to 0.00mlL-1 (control) 0.1, 0.2, 0.3, 0.4, 0.5mL-1 industrial effluents in triplicates in plastic tanks under a static renewal condition for 15 days to determine the effect of the exposure on the haemoglobin (Hb), red blood c...

The effect of anaesthetic metomidate on the enzymes activities (Alanine transminase – ALT; Aspartate transaminase – AST; Alkaline phosphatase-ALP and Lactate dehydrogenase – LDH) in female Clarias gariepinus was investigated using different concentrations (0.00mlL-1 – control; 0.25; 0.75; 1.00; 2.00; 6.00; 8.00; 10.00 and 12.00mlL-1) in triplicates...

The effects of Clove Seed extracts as anaesthetic agents in two species of grey mullets Liza Falcipinnis and Liza grandisquamis were assessed. A total of 120 of these species comprising 60 L. Falcipinnis with 30 each of fingerlings (mean length 9.86cm ± 1.11 SD: mean weight 21.20g ± 2.10 SD) and juveniles (mean length 17.24cm ±1.88 SD; mean weight...

Thirty adult African catfish, Clarias gariepinus (mean length 29.47cm±1.88SD; mean weight 276.44g±81.91SD) were exposed to sublethal levels. (0.00 , 0.05, 0.10, 0.20 and 0.25mlL-1) of cypermethrin for 10 days, to determine alterations in some electrolytes such as potassium (k +), sodium (Na +), chloride (Cl-) and hydrogen carbonate (HCO

Blood samples were collected from 200 Clarias gariepinus brood stock comprising 100 each of females (mean length 60.23cm ± 0.36SD; mean weight 2,640.14g ± 0.02SD) and males (mean length 59.14cm ± 0.1457; mean weight 2,620.22g ± 0.0857) cultured for 18 months in water recirculating system were collected and analyzed for haematological parameters, su...

Haematological characteristics of Anadara senilis was investigated. A total of two hundred and forty (240) were sampled from Andoni flats during low tide. They were immediately transferred to the laboratory, where they were sorted and grouped into four different sizes. Group one comprised of (mean length 2.54 cm  2.42 and mean weight of 8.37g  2....

An empirical survey of macrophytes distribution and biomass from four stations, along Nta-wogba stream in Port Harcourt, Nigeria, was conducted between April and December 2007, to quantify the relationship between biomass, in stream nutrients and dissolved ions. The correlation analysis indicated that the biomass of the aquatic macrophytes under co...

Clinical evaluation of blood parameters is routinely used to assess the health of wild and domestic animals. The commercial cat�耀sh industry in Nigeria has undergone rapid expansion in recent years. An understanding of normal hematology values for healthy �耀sh and the identi�耀cati on of predictors of the onset of health problems may enable �耀sh he...

Aquaculture in Nigeria has witnessed some expansion in recent times that this is fairly insignificant relative to world standard. With the demand for fish increasing everyday, there is the need for new approach towards increasing fish production. The application of genetics can play a significant role in efforts to increase aquaculture production....

Sarotherodon melanotheron ( Mean length 14.21 cm ± 3.14 SD and Mean weight 96. 34g± 15. 26 SD) were exposed in triplicates to 40 liter solution of graded levels of industrial effluents (0.025, 0.050, 0.075, 0.100, and 0.125mIL-1 and control 0.00mlL-1 for 14 days. At the end of the trial organs (gill, liver, kidney, spleen) and Muscle tissues were a...

Aquaculture venture in Niger Delta Region of Nigeria is an industry that encompasses fish cultivation in a controlled environment. It has evolved through numerous phases and stages with its potential yet to be fully tapped. To affirm this potential in contributing to human development, food security and improved standard of living, the aquaculture...

The issue of environmental pollution has become a global phenomenon in recent years, of importance is the aquatic environment, which acts as a sink for these contaminants which pose serious threats to. many organisms especially fish. For many years direct mortality have been the major methods of assisting the effects of nonlethal effects on fish po...

Nta-Wogba stream in Port Harcourt metropolis was sampled between April and December 2007 to determine aquatic macrophyte cover and biomass along the stream. Four sampling stations: 1. (Abacha Road) 2. (Olu-Obasanjo Road), 3. (Okija Road) and 4. (Afam Road) were selected. They were about 3km apart, and received discharges from construction, automibl...

The physico-chemical parameters (temperature, pH, turbidity, salinity and alkalinity), nutrient levels (nitrate, phosphate, ammonium, sulphate and total dissolved solids, TDS) and biological productivity (Dissolved oxygen, DO and Biological oxygen demand, BOD) of Nta-Wogba stream (Port Harcourt) was assessed between the months April and December 20...

The physico-chemical parameters (temperature, pH, turbidity, salinity and alkalinity), nutrient levels (nitrate, phosphate, ammonium, sulphate and total dissolved solids, TDS) and biological productivity (Dissolved oxygen, DO and Biological oxygen demand, BOD) of Nta-Wogba stream (Port Harcourt) was assessed between the months April and December 20...

Changes in blood parameters of Tilapia guineensis transferred directly from brackish water (salinity 14.5 ‰) to fresh water (0.12 ‰) was investigated to assess the effect of sudden change in environment on fish blood characteristics. The results obtained indicated significant reduction (p < 0.05) in mean values of haemoglobin (Hb) from 5.50  0.61...

Values of some haematological indices were assessed in 60 adults of Tilapia guineensis (mean length 21.14cm ± 4.16; mean weight 386.12g ± 6.12). They were collected from recruitment ponds of African Regional Aquaculture Centre, Brackish water fish farm, Buguma during low tides. The blood samples were collected from the kidney behind the anal fin. T...

The effect of acclimation on blood composition of juvenile and adult sizes of Tilapia guineensis was investigated. A total of eighty (80) fish, comprising forty each of juvenile and adult sizes were collected from the wild (Buguma Creek) and acclimated in the experimental tanks for a period of seven days. The pooled data of the results indicated al...

The effect of acclimation on blood composition of juvenile and adult sizes of Tilapia guineensis was investigated. A total of eighty (80) fish, comprising forty each of juvenile and adult sizes were collected from the wild (Buguma Creek) and acclimated in the experimental tanks for a period of seven days. The pooled data of the results indicated al...

Changes in blood parameters of Tilapia guineensis transferred directly from brackish water (salinity 14.5 ‰) to fresh water (0.12 ‰) was investigated to assess the effect of sudden change in environment on fish blood characteristics. The results obtained indicated significant reduction (p < 0.05) in mean values of haemoglobin (Hb) from 5.50  0.61...

The effect OF season on length weight relationship of grey mullets Liza faIcipinnis from Buguma Creek, Niger Delta, Nigeria was determined. Samples of the specie were collected bimonthly February 2005 to January 2006. Total lengths (cm) of the Fish wore measure and corresponding weight: (g) recorded. The data obtained were subjected to linear regre...

The effect OF season on length weight relationship of grey mullets Liza faIcipinnis from Buguma Creek, Niger Delta, Nigeria was determined. Samples of the specie were collected bi-monthly February 2005 to January 2006. Total lengths (cm) of the Fish wore measure and corresponding weight: (g) recorded. The data obtained were subjected to linear regr...

Variations in Oxygen Carrying Capacity of Sarotherodon melanotheron was investigated. The fish were acclimated using three media (brackish water, gradual reduction in salinity and fresh water) for a period of seven days. The results indicated various levels of reduction (p<0.05) exhibited by both juveniles and adults, before and after acclimation i...

Poverty is generally considered as one of the major causes of food insecurity and poverty alleviation is essential in improving access to food. Among countries in the developing world, including Nigeria, the people in the fishing sectors are some of the poorest and most neglected. This is true of the fishers in the Niger Delta Region of Nigeria. De...

The population of people living in Nigeria has risen tremendously in recent years with its corresponding increase in demand for food. Thus, there is the need for a suitable agricultural system to meet this increasing demand and also maximize the utilization of the available limited resources without much wastage integrated fish farming offers hope...

Aquaculture development and growth in Africa have been on low ebb despite the vast aquatic resources that abounds on the continent. Since the introduction of aquaculture to Africa, some decades ago, there have been a lot of innovations, technological advancement and progress in the areas of genetics, seed propagation, pond construction and farm man...

The production of fish meal in Nigeria from the wild sources has for some period now been dwindling and when available are very expensive, because most of the fish meal used in fish feed formulation are imported. Hence viable alternatives have to be found for the sustainability of the aquaculture industry in the country. Plant based protein sources...

Effects of transportation induced stress, on the haematology of Sarotherodon melanotheron was investigated. One hundred and twenty adult male and female S. melanotheron mean weight (44.24 g ±0.26) and mean length (14.12 cm±0.34) were harvested at low tide from the recruitment ponds of the African Regional Aquaculture Centre, Brackish water research...